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Seattle Fault

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rock that is being forced up a ramp. Subsequent work suggests that the structure of the Seattle Fault may vary from east to west, with both models being applicable in different sections. A later model has part of the north-thrusting sheet forming a wedge between the sedimentary formations of the Seattle Basin and the underlying bedrock.
413:-based mapping; trenching has generally shown the faulting to be more complex than was first realized. Many of the details of the Seattle Fault, including recurrence rate, remain to be resolved. A study of sediments in Lake Washington found evidence of seven large (M > 7) earthquakes in the last 3,500 years. 488:
magnitude 9 subduction event would damage only around 87 bridges in all of Western Washington. The same study also found that with failure of just six bridges (the minimum damage for a Benioff M 6.5 event) there could be at least $ 3 billion lost in business revenue alone. Subsequent retrofitting by the
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Other recent work indicates that the Seattle Fault can generate two types of earthquakes; both pose "considerable hazard" to the Seattle metropolitan region. The A.D. 900–930 earthquake is believed to be the only instance in the past 7,000 years of the type that causes a regional uplift. The other
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studies show that the Seattle Fault can generate a very damaging magnitude 7.0 earthquake. In addition to extensive damage to unreinforced structures and structures built on fill (such as much of Seattle's Pioneer Square area, the industrial area, and the waterfront), computer modeling has shown
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is the southern edge. One model has the Seattle and Tacoma faults converging at depth to form a wedge, which is being popped up by approximately north–south oriented compression that ultimately derives from plate tectonics. Another model (see diagram) interprets the Seattle Uplift as a sheet of
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of the Crescent Formation on the south has been uplifted – the Seattle Uplift – and is tipping into the Seattle Basin, where the Tertiary bedrock is buried under at least 7 km (4.3 miles) of relatively softer, lighter sedimentary strata of the younger Blakeley and Blakely Harbor formations.
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One model of the Seattle Uplift: Cross-section (south to north) along the east side of central Puget Sound, looking west. TB = Tacoma Basin EPZ = East Passage Zone (Maury Island), SFZ = Seattle Fault Zone (Alki Point). Grey dots are hypocenters of earthquakes of magnitude 2 or more for 1970–2001.
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Although the 923-924 CE earthquake was over a thousand years ago, local traditional stories have preserved an association of a powerful supernatural spirit – a'yahos, noted for shaking, rushes of water, and landsliding – with five locales along the trace of the Seattle Fault, including a "spirit
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But the Seattle and Tacoma faults are probably the most serious earthquake threat to the populous Seattle–Tacoma area. A 2002 study of bridge vulnerability estimated that a magnitude 7 earthquake on the Seattle Fault would damage approximately 80 bridges in the Seattle–Tacoma area, whereas a
29: 406:. It appears that when the Straight Creek Fault became stuck the north–south compressive force that it had accommodated by strike-slip motion was transferred to the crust of the Puget Lowland, which subsequently folded and faulted, and the various blocks jammed over one another. 2107:
Moore, G. L.; Roland, E.; Bennett, S. E. K.; Watt, J.; Kluesner, J.; Brothers, D.; Myers, E. (2022). "High-Resolution Marine Seismic Imaging of the Seattle Fault Zone: Near-Surface Insights into Fault Zone Geometry, Quaternary Deformation, and Long-Term Evolution".
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Tabor, R. W.; Frizzell, V. A. Jr.; Vance, J. A.; Naeser, C. W. (January 1984), "Ages and stratigraphy of lower and middle Tertiary sedimentary and volcanic rocks of the central Cascades, Washington: Application to the tectonic history of the Straight Creek fault",
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Black, Bryan A.; Pearl, Jessie K.; Pearson, Charlotte L.; Pringle, Patrick T.; Frank, David C.; Page, Morgan T.; Buckley, Brendan M.; Cook, Edward R.; Harley, Grant L.; King, Karen J.; Hughes, Jonathan F.; Reynolds, David J.; Sherrod, Brian L. (2023).
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type is more localized and shallower (and therefore more damaging); at least four such events are believed to have occurred in the past 3,000 years on the west end of the fault. (The history of the central and eastern segments is not known.)
351:. Most of the faulting is "blind" (not reaching the surface), and generally difficult to locate because of heavy vegetation or development. Three principal strands have been identified, their location determined by high-resolution 1429:
Daneš, Z. F.; Bonno, M. M.; Brau, E.; Gilham, W. D.; Hoffman, T. T.; Johansen, D.; Jones, M. H.; Malfait, B.; Masten, J.; Teague, G. O. (15 November 1965), "Geophysical investigation of the Southern Puget Sound area, Washington",
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Kelsey, H. M.; Sherrod, B. L.; Nelson, A. R.; Brocher, T. M. (November–December 2008), "Earthquakes generated from bedding plane-parallel reverse faults above an active wedge thrust, Seattle fault zone.",
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on Puget Sound, turbidity in lake paleosediments, rock avalanches, and multiple landslides around Lake Washington, and determined that all these happened about 1,100 years ago (between 923 and 924
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Anderson, M. L.; Dragovich, J. D.; Blakely, R. J.; Wells, R.; Brocher, T. M. (2008), "Where Does the Seattle Fault End? Structural Links and Kinematic Implications [Abstract #T23B-2022]",
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Johnson, S. Y.; Blakely, R. J.; Brocher, T. M.; Bucknam, R. C.; Haeussler, P. J.; Pratt, T. L.; Nelson, A. R.; Sherrod, B. L.; Wells, R.E.; Lidke, D.J.; Harding, D.J.; Kelsey, H.M. (2004),
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Dragovich, J. D.; Walsh, T. J.; Anderson, M. L.; Hartog, R.; DuFrane, S. A.; Vervoot, J.; Williams, S. A.; Cakir, R.; Stanton, K. D.; Wolff, F. E.; Norman, D. K.; Czajkowski, J. L. (2009),
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González, F. I.; Sherrod, B. L.; Atwater, B. F.; Frankel, A. P.; Palmer, S. P.; Holmes, M. L.; Karlin, R. E.; Jaffe, B. E.; Titov, V. V.; Mofjeld, H. O.; Venturato, A. J. (June 2003),
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Approximate location of the Seattle Fault Zone (and other faults). The section of the fault zone directly under "Seattle" corresponds to the red line in the photo at the top. (DGER)
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The Seattle Fault (and the related Tacoma Fault) is not the only source of earthquake hazard in the Puget Lowland. Other faults in the near surface continental crust, such as the
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at Restoration Point (foreground in picture above), the Seattle Fault's existence and likely hazard were definitively established by a set of five reports published in
247:. The Seattle Fault was first recognized as a significant seismic hazard in 1992, when a set of reports showed that about 1,100 years ago it was the scene of a major 2634: 1234:"Location, structure, and seismicity of the Seattle fault zone, Washington: Evidence from aeromagnetic anomalies, geologic mapping, and seismic-reflection data" 539:
30 miles south (Tacoma) and low-lying areas on the Puyallup River delta. There is also concern that a severe or prolonged event could cause failure of the
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due to faulting are rarely observed in this area (due to topography, vegetation, and urbanization); a rare exception can be seen at Mee Kwa Mooks Park south of
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Nelson, A. R.; Johnson, S. Y.; Kelsey, H. M.; Wells, R. E.; Sherrod, B. L.; Pezzopane, S. K.; Bradley, L.; Koehler, R. D.; Bucknam, R. C. (November 2003),
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The much greater energy of subduction earthquake is spread out over a larger area, and concentrated mainly on the coast, where there is less development.
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and the City of Seattle would likely reduce damage to key bridges. But there is concern that such an earthquake on the Seattle Fault would devastate
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of about magnitude 7 – an event that entered Native American oral traditions. Extensive research has since shown the Seattle Fault to be part of a
2585: 2262: 2755: 505: 468:; being so deep their energy is dissipated. And there are the infrequent but very powerful great subduction events, such as the magnitude 9 2570: 1471:
Fisher, M. A.; Hyndman, R. D.; Johnson, S. Y.; Brocher, T. M.; Crosson, R. S.; Wells, R. A.; Calvert, A. J.; ten Brink, U. S. (2005),
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Brocher, T. M.; Parsons, T.; Blakely, R. J.; Christensen, N. I.; Fisher, M. A.; Wells, R. E.; the SHIPS Working Group (10 July 2001),
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Ludwin, R. S.; Thrush, C. P.; Buerge, D.; Jonientz-Trisler, C.; Rasmussen, J.; Troost, K.; de los Angeles, A. (July–August 2005),
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This has resulted in a 4 to 7 km (2.5 to 4.3 miles) wide zone of complex faulting, with three or more main south-dipping
1322:"Upper crustal structure in Puget Lowland, Washington: Results from the 1998 Seismic Hazards Investigation in Puget Sound" 2760: 2255: 2083:
Walsh, T. J.; Arcas, D.; Venturato, A. J.; Titov, V. V.; Mofjeld, H. O.; Chamberlin, C. C.; González, F. I. (July 2009),
1473:"Crustal Structure and Earthquake Hazards of the Subduction Zone in Southwestern British Columbia and Western Washington" 2070:
Vance, J. A.; Miller, R. B. (1994), "Another look at the Fraser River-Straight Creek Fault (FRSCF) [abstract]",
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on the west (not shown on the map). However, boundaries defining the western termination zone is currently unclear (see
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deltas, where the main port facilities for Seattle and Tacoma are located (Harbor Island and Commencement Bay).
2639: 2248: 2085:"Tsunami hazard map of Tacoma, Washington—Model results for Seattle fault and Tacoma fault earthquake tsunamis" 1755:"Holocene landslides and a 3500-year record of Pacific Northwest earthquakes from sediments in Lake Washington" 1531: 264: 2750: 2438: 2380: 2316: 2197: 2084: 2049: 493: 364: 2057: 1502:
Haugerud, R. A.; Harding, D. J.; Johnson, S. Y.; Harless, J. L.; Weaver, C. S.; Sherrod, B. L. (June 2003),
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in 1992. These reports looked at the timing of abrupt uplift and subsidence around Restoration Point and
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itself. Restoration Point in the foreground, Alki Point is barely seen at the right edge of the picture.
1893:"Late Holocene earthquakes on the Toe Jam Hill fault, Seattle fault zone, Bainbridge Island, Washington" 1541:"Tree Ring Correlation Between Prehistoric Landslides and Abrupt Tectonic Events in Seattle, Washington" 2616: 2400: 2065:, Seattle-Area Geologic Mapping Project Department of Earth and Space Sciences University of Washington 1841: 444:(Haiti) harbor leaning after earthquake-induced ground failure. Seattle's waterfront faces similar risk 1754: 2160:
USGS Professional Paper 1560: Assessing Earthquake Hazards and Reducing Risk in the Pacific Northwest
1589:"Active shortening of the Cascadia forearc and implications for seismic hazards of the Puget Lowland" 1421:
Buerge, D. M. (March 6–13, 1985), "Lost Seattle, our shameful neglect of a rich archeological past",
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Blakely, R. J.; Sherrod, B. L.; Hughes, J. F.; Anderson, M. L.; Wells, R. E.; Weaver, C. S. (2009),
655:"A multifault earthquake threat for the Seattle metropolitan region revealed by mass tree mortality" 2310: 2298: 2240: 473: 469: 2208: 1671: 531:
that such earthquakes could cause a tsunami of about 2 m (6 feet 7 inches) high on
2606: 2488: 2375: 1504:"High-Resolution Lidar Topography of the Puget Lowland, Washington – A Bonanza for Earth Science" 501: 461: 152: 1829:"Inundation modeling of local tsunamis in Puget Sound, Washington, due to potential earthquakes" 2508: 1639: 1540: 1962: 2710: 2689: 2664: 2390: 2203: 1704:"Paleoearthquakes in the Puget Sound Region Recorded in Sediments from Lake Washington, U.S." 497: 371: 352: 187: 449: 375: 2170: 2117: 2037: 1977: 1942: 1907: 1872: 1808: 1766: 1718: 1683: 1651: 1603: 1552: 1518: 1439: 1386: 1336: 1299: 1248: 1220: 1184: 1136: 666: 399: 157: 2224: 1703: 1587:
Johnson, S. Y.; Blakely, R. J.; Stephenson, W. J.; Dadisman, S. V.; Fisher, M. A. (2004),
1488: 1371: 1169: 453: 8: 2611: 2512: 2433: 421: 356: 306: 278: 172: 2121: 2041: 1981: 1946: 1911: 1876: 1812: 1770: 1722: 1687: 1655: 1607: 1556: 1522: 1443: 1390: 1340: 1303: 1252: 1188: 1140: 687: 670: 654: 363:. The central section of the fault zone – where it crosses the apparent location of the 2727: 2722: 2498: 2483: 2443: 2405: 2334: 2141: 2001: 1842:"The western extension of the Seattle fault: new insights from seismic reflection data" 1742: 1576: 1410: 1264: 1208: 527: 496:, of which the City of Seattle is estimated to have around a thousand, concentrated in 465: 289:, and most likely due to an earthquake of magnitude 7 or greater on the Seattle Fault. 252: 240: 209: 132: 107: 1148:
Atwater, B. F. (1999), "Radiocarbon dating of a Seattle earthquake to A.D. 900–930.",
535:. The modeling shows that such a tsunami would also inundate the industrial areas on 2503: 2385: 2346: 2145: 2133: 2013: 1993: 1734: 1568: 1402: 1268: 1200: 692: 199: 2005: 1580: 1414: 1212: 1130: 2234: 2125: 2045: 1985: 1950: 1926:
Pratt, T. L.; Johnson, S. Y.; Potter, C. J.; Stephenson, W. J. (10 December 1997),
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Seismic Vulnerability Assessment of the Seattle–Tacoma Highway Corridor using HAZUS
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The Seattle Fault is the structural boundary where 50–60 million years old (early
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surveys. The northernmost strand lies nearly along Interstate 90 and then under
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First suspected from mapping of gravitational anomalies in 1965 and an uplifted
2601: 2565: 1472: 1460:"Geologic map of the North Bend 7.5-minute quadrangle, King County, Washington" 544: 540: 477: 441: 398:). This is about the time that the strike-slip movement on the north-striking 360: 270: 2165: 1372:"Abrupt Uplift Within the Past 1700 Years at Southern Puget Sound, Washington" 2744: 2716: 2684: 2544: 2478: 2358: 2214: 2159: 2137: 1232:
Blakely, R. J.; Wells, R. E.; Weaver, C. S.; Johnson, S. Y. (February 2002),
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Karlin, R. E.; Holmes, M.; Abella, S. E. B.; Sylvester, R. (February 2004),
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Johnson, S. Y.; Dadisman, S. V.; Childs, J. R.; Stanley, W. D. (July 1999),
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The Seattle Fault is believed to date from about 40 million years ago (late
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Geological Society of America 1994 Annual Meeting, Abstracts with Programs
2575: 2539: 2457: 1672:"Origin and evolution of the Seattle Fault and Seattle Basin, Washington" 1616: 1349: 532: 417: 370:
The fault extends for approximately 70 km (43 miles) from near
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Other scarps associated with the Seattle fault have been identified by
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Bucknam, R. C.; Hemphill-Haley, E.; Leopold, E. B. (4 December 1992),
2014:"City of Seattle Unreinforced Masonry Building Seismic Hazards Study" 1919: 1820: 1778: 325: 2270: 1787:"Seismic stability of the Duwamish River delta, Seattle, Washington" 1786: 515:
Damage to a masonry building (Cadillac Hotel) in Seattle, from the
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Jacoby, G. C.; Williams, P. L.; Buckley, B. M. (4 December 1992),
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Schuster, R. L.; Logan, R. L.; Pringle, P. T. (4 December 1992),
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Johnson, S. Y.; Potter, C. J.; Armentrout, J. M. (January 1994),
232: 117: 50: 38: 386:). It is the northern edge of the Seattle Uplift, of which the 28: 403: 395: 343: 214: 410: 2198:
Scenario for a Magnitude 6.7 Earthquake on the Seattle Fault
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10.1130/0091-7613(1994)022<0071:OAEOTS>2.3.CO;2
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10.1130/0016-7606(1999)111<1042:ATOTSF>2.3.CO;2
1466:, Geological Map GM–73, 1 sheet, scale 1:24,000, 39 p. text 1261:
10.1130/0016-7606(2002)114<0169:LSASOT>2.0.CO;2
1170:"A Tsunami About 1000 Years Ago in Puget Sound, Washington" 2166:
USGS: Reducing Earthquake Hazards in the Pacific Northwest
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10.1130/1052-5173(2003)13<0004:HLTOTP>2.0.CO;2
1365:, Geologic Map GM–52, 1 sheet, scale 1:625,000, 12 p. text 292: 16:
Zone of multiple thrust faults that passes through Seattle
1359:"Tectonic elements and evolution of northwest Washington" 2050:
10.1130/0016-7606(1984)95<26:AASOLA>2.0.CO;2
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Quaternary fault and fold database for the United States
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City of Seattle Department of Planning and Development
1858:"Serpent Spirit-power Stories along the Seattle Fault" 374:
on the east, where it appears to be terminated by the
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Technical, but readable. And has many good pictures.
1489:"Puget Sound Tsunami Sources – 2002 Workshop Report" 1219:
Ballantyne, D.; Pierepiekarz, M.; Chang, S. (2002),
2177:"Pinpointing devastation if Seattle Fault ruptures" 1702:Karlin, R. E.; Abella, S. E. B. (4 December 1992), 2204:Washington State's Bridge Seismic Retrofit Program 2092:Washington Division of Geology and Earth Resources 1464:Washington Division of Geology and Earth Resources 1363:Washington Division of Geology and Earth Resources 1051:, "Executive Summary", § 2.1.3, and figure 2. 384:Puget Sound faults#Question of western termination 2225:Tsunami Hazard Map of the Elliott Bay Area (NOAA) 2742: 2209:Earthquake Study: Four Vashon-Specific Scenarios 2110:Bulletin of the Seismological Society of America 1826: 1357:Brown, E. H.; Dragovich, J. D. (December 2003), 1218: 1168:Atwater, B. F.; Moore, A. L. (4 December 1992), 1084: 1036: 1015: 1457: 820: 231:that cross the Puget Sound Lowland and through 2215:Puget Sound Tsunami Inundation Modeling (NOAA) 2059:Geology of Seattle: City of Seattle Field Trip 2011: 1960: 1784: 1501: 1486: 1128: 1112: 1108: 1048: 943: 848: 627: 2256: 2230:Additional inundation maps (DNR Publications) 2012:Swanson, D. B.; Findlay, A. (December 2007), 1669: 1637: 1586: 1369: 1319: 1282: 1231: 1072: 999: 915: 883: 859: 832: 804: 792: 780: 768: 741: 591: 402:to the east ceased, due to the intrusions of 331: 2056:Troost, K. G.; Booth, D. B. (May 22, 2004), 1890: 1855: 1797: 1752: 1701: 1538: 1470: 1167: 1132:American Geophysical Union Fall Meeting 2008 1060: 1003: 983: 971: 967: 955: 899: 895: 745: 709: 639: 615: 603: 2082: 2069: 2055: 2026: 1925: 1623: 1428: 1096: 987: 931: 927: 911: 871: 808: 757: 737: 579: 2263: 2249: 452:(near Everett), and the yet to be studied 27: 1615: 1530: 1348: 1311: 686: 2645:Middleton Place–Summerville Seismic Zone 1851:, NEHRP, Project Award Number 08HQGR0075 510: 435: 324: 316: 291: 227:is a zone of multiple shallow east–west 1839: 1785:Kayen, R. E.; Barnhardt, W. A. (2007), 1147: 836: 526:Calculations based on fault length and 490:Washington Department of Transportation 177: 2743: 2571:Long Point–Eureka Heights fault system 2329:Northern Cordilleran Volcanic Province 1827:Koshimura, S.; Mofjeld, H. O. (2001), 1626:"Fault number 570, Seattle fault zone" 1420: 713: 2695:Enriquillo–Plantain Garden fault zone 2244: 2171:USGS: Earthquake ground motion movies 296:Representation of the a'yahos spirit. 258: 2756:Seismic faults of Washington (state) 494:unreinforced masonry (URM) buildings 1628:, in U.S. Geological Survey (ed.), 13: 2655:Northern Appalachians Seismic Zone 2100: 14: 2772: 2353:Southern Great Lakes Seismic Zone 2237:Use of Lidar for locating faults. 2153: 1835:(Session 7, Number 7–18): 861–873 1356: 726: 725:Excerpt from DGER Geological Map 281:(distant right side of picture), 2530:Independence Valley fault system 2220:Elliott Bay inundation map (DNR) 557:Geology of the Pacific Northwest 2706:Lesser Antilles subduction zone 2211:Considerations for all islands. 1935:Journal of Geophysical Research 1432:Journal of Geophysical Research 1329:Journal of Geophysical Research 1102: 1090: 1078: 1066: 1054: 1042: 1030: 1021: 1009: 993: 977: 961: 949: 937: 921: 905: 889: 877: 865: 853: 842: 826: 814: 798: 786: 774: 762: 751: 731: 2640:Eastern Tennessee Seismic Zone 1865:Seismological Research Letters 1150:Seismological Research Letters 719: 703: 645: 633: 621: 609: 597: 585: 573: 265:Lake Washington sunken forests 33:The Seattle Fault cuts across 1: 2381:Laurentian Slope Seismic Zone 2317:Clarendon-Linden fault system 1990:10.1126/science.258.5088.1620 1731:10.1126/science.258.5088.1617 1565:10.1126/science.258.5088.1621 1399:10.1126/science.258.5088.1611 1197:10.1126/science.258.5088.1614 178: 2701:Gulf of California Rift Zone 2235:Puget Sound Lidar Consortium 2183:, 2005-02-20, archived from 1085:Koshimura & Mofjeld 2001 1037:Ballantyne & others 2002 1016:Ballantyne & others 2002 440:Shipping-container crane at 309:ferry dock in West Seattle. 7: 2561:Central Oklahoma Fault Zone 2411:Western Quebec Seismic Zone 2305:Canadian Arctic Rift System 1793:, Professional Paper 1661-E 1482:, Professional Paper 1661-C 821:Dragovich & others 2009 550: 10: 2777: 2761:Buried rupture earthquakes 2617:Wabash Valley Seismic Zone 2401:Saint Lawrence rift system 2286:(crosses national borders) 1121: 1113:Kayen & Barnhardt 2007 1109:Gonzalez & others 2003 1049:Swanson & Findlay 2007 944:Haugerud & others 2003 874:, § 4.3 and figure 2. 849:Anderson & others 2008 628:Schuster & others 1992 450:South Whidbey Island Fault 424:. This is the site of the 376:South Whidbey Island Fault 312: 262: 2677: 2625: 2594: 2553: 2522: 2466: 2439:Olympic–Wallowa Lineament 2426: 2419: 2368: 2283: 2094:, Open File Report 2009-9 1073:Bucknam & others 1992 1000:Bucknam & others 1992 916:Blakely & others 2002 884:Johnson & others 2004 860:Brocher & others 2001 833:Blakely & others 2009 805:Blakely & others 2002 793:Blakely & others 2002 781:Blakely & others 2002 769:Johnson & others 1999 742:Johnson & others 1994 592:Bucknam & others 1992 517:2001 Nisqually earthquake 458:2001 Nisqually earthquake 431: 365:Olympic–Wallowa Lineament 332:Johnson & others 2004 253:regional system of faults 208: 198: 186: 171: 163: 151: 146: 138: 128: 123: 113: 103: 95: 56: 46: 26: 21: 2311:Cascadia subduction zone 2299:Basin and Range Province 2200:Vivid and comprehensive. 1941:(B12): 27, 469–27, 490, 1061:Kelsey & others 2008 1004:Fisher & others 2005 984:Kelsey & others 2008 972:Karlin & others 2004 968:Karlin & Abella 1992 956:Nelson & others 2003 900:Nelson & others 2003 896:Kelsey & others 2008 746:Nelson & others 2003 710:Ludwin & others 2005 640:Jacoby & others 1992 616:Karlin & Abella 1992 604:Atwater & Moore 1992 567: 474:Cascadia subduction zone 470:1700 Cascadia earthquake 2607:New Madrid Seismic Zone 2494:Newport–Inglewood Fault 2489:Mendocino Fracture Zone 2376:Charlevoix Seismic Zone 1840:Liberty, L. M. (2009), 1791:U. S. Geological Survey 1480:U. S. Geological Survey 1452:10.1029/JZ070i022p05573 1335:(B7): 13, 541–13, 564, 1097:Walsh & others 2009 988:Troost & Booth 2004 932:Tabor & others 1984 928:Vance & Miller 1994 912:Pratt & others 1997 872:Pratt & others 1997 738:Pratt & others 1997 580:Danes & others 1965 142:70 km (43 mi) 2509:San Jacinto Fault Zone 1885:10.1785/gssrl.76.4.426 1849:U.S. Geological Survey 1162:10.1785/gssrl.70.2.190 679:10.1126/sciadv.adh4973 519: 506:International District 445: 335: 322: 297: 2711:Middle America Trench 2690:Chixoy-Polochic Fault 2665:Virginia Seismic Zone 2626:Appalachian Mountains 2427:Washington and Oregon 2391:Queen Charlotte Fault 1143:, abstract #T23B-2022 514: 439: 328: 320: 295: 245:Interstate Highway 90 243:) in the vicinity of 2751:Geography of Seattle 2678:Caribbean and Mexico 1833:ITS 2001 Proceedings 1807:(11/12): 1581–1597, 1617:10.1029/2003TC001507 1350:10.1029/2001JB000154 400:Straight Creek Fault 2635:Aiken–Augusta Fault 2612:Sandwich Fault Zone 2513:Elsinore Fault Zone 2434:Brothers Fault Zone 2122:2022BuSSA.112.2715M 2042:1984GSAB...95...26T 1982:1992Sci...258.1620S 1947:1997JGR...10227469P 1912:2003GSAB..115.1388N 1877:2005SeiRL..76..426L 1813:2008GSAB..120.1581K 1771:2004GSAB..116...94K 1723:1992Sci...258.1617K 1688:1994Geo....22...71J 1656:1999GSAB..111.1042J 1608:2004Tecto..23.1011J 1557:1992Sci...258.1621J 1523:2003GSAT...13f...4H 1444:1965JGR....70.5573D 1391:1992Sci...258.1611B 1341:2001JGR...10613541B 1304:2009Geosp...5..105B 1253:2002GSAB..114..169B 1189:1992Sci...258.1614A 1183:(5088): 1614–1617, 1141:2008AGUFM.T23B2022A 671:2023SciA....9H4973B 472:, where the entire 76: /  2728:Puerto Rico Trench 2723:Pedro Miguel Fault 2628:and Atlantic Coast 2499:Puente Hills Fault 2484:Hayward Fault Zone 2406:Timiskaming Graben 2335:Puget Sound faults 2273:seismically active 2130:10.1785/0120220013 1313:10.1130/GES00196.1 528:paleoseismological 520: 466:Juan de Fuca Plate 464:of the subducting 446: 426:West Seattle Fault 353:seismic reflection 336: 323: 298: 259:Notable earthquake 133:Puget Sound faults 80:47.610°N 122.333°W 2736: 2735: 2719:(Central America) 2713:(Central America) 2673: 2672: 2581:Nemaha Fault Zone 2504:Rose Canyon Fault 2386:Leech River Fault 2347:San Andreas Fault 1955:10.1029/97JB01830 1906:(11): 1368–1403, 1438:(22): 5573–5580, 1002:, p. 1611; 221: 220: 217:-recent (40-0 Ma) 2768: 2424: 2423: 2278:of North America 2265: 2258: 2251: 2242: 2241: 2194: 2193: 2192: 2149: 2116:(5): 2715–2744. 2095: 2089: 2079: 2066: 2064: 2052: 2023: 2018: 2008: 1967: 1957: 1932: 1922: 1920:10.1130/B25262.1 1897: 1887: 1862: 1852: 1846: 1836: 1823: 1821:10.1130/B26282.1 1794: 1781: 1779:10.1130/B25158.1 1749: 1708: 1698: 1666: 1650:(7): 1042–1053, 1634: 1620: 1619: 1602:(TC1011): 1–27, 1593: 1583: 1535: 1534: 1508: 1498: 1493: 1483: 1477: 1467: 1454: 1425: 1417: 1376: 1366: 1353: 1352: 1326: 1316: 1315: 1289: 1279: 1277: 1271:, archived from 1238: 1228: 1227: 1215: 1174: 1164: 1144: 1116: 1106: 1100: 1094: 1088: 1082: 1076: 1070: 1064: 1058: 1052: 1046: 1040: 1034: 1028: 1025: 1019: 1013: 1007: 997: 991: 981: 975: 965: 959: 953: 947: 941: 935: 925: 919: 909: 903: 893: 887: 881: 875: 869: 863: 857: 851: 846: 840: 830: 824: 818: 812: 802: 796: 790: 784: 778: 772: 766: 760: 755: 749: 735: 729: 723: 717: 707: 701: 700: 690: 665:(39): eadh4973. 659:Science Advances 649: 643: 637: 631: 625: 619: 613: 607: 601: 595: 589: 583: 577: 537:Commencement Bay 482:Vancouver Island 301:boulder" called 283:tsunami deposits 180: 91: 90: 88: 87: 86: 85:47.610; -122.333 81: 77: 74: 73: 72: 69: 31: 19: 18: 2776: 2775: 2771: 2770: 2769: 2767: 2766: 2765: 2741: 2740: 2737: 2732: 2669: 2649:Woodstock Fault 2627: 2621: 2590: 2549: 2518: 2474:Calaveras Fault 2462: 2415: 2396:Saguenay Graben 2364: 2341:Rio Grande rift 2293:Aleutian Trench 2285: 2279: 2269: 2190: 2188: 2175: 2156: 2103: 2101:Further reading 2098: 2087: 2062: 2016: 1965: 1930: 1895: 1860: 1844: 1765:(1–2): 94–108, 1706: 1591: 1506: 1491: 1475: 1374: 1324: 1287: 1275: 1236: 1225: 1172: 1124: 1119: 1107: 1103: 1095: 1091: 1083: 1079: 1071: 1067: 1059: 1055: 1047: 1043: 1035: 1031: 1026: 1022: 1014: 1010: 998: 994: 982: 978: 966: 962: 954: 950: 942: 938: 926: 922: 910: 906: 894: 890: 882: 878: 870: 866: 858: 854: 847: 843: 831: 827: 819: 815: 809:QFFDB Fault 570 803: 799: 791: 787: 779: 775: 767: 763: 758:QFFDB Fault 570 756: 752: 736: 732: 724: 720: 708: 704: 650: 646: 638: 634: 626: 622: 614: 610: 602: 598: 590: 586: 578: 574: 570: 553: 434: 330:(Fig. 17D from 315: 267: 261: 124:Characteristics 84: 82: 78: 75: 70: 67: 65: 63: 62: 42: 17: 12: 11: 5: 2774: 2764: 2763: 2758: 2753: 2734: 2733: 2731: 2730: 2725: 2720: 2714: 2708: 2703: 2698: 2692: 2687: 2681: 2679: 2675: 2674: 2671: 2670: 2668: 2667: 2662: 2657: 2652: 2642: 2637: 2631: 2629: 2623: 2622: 2620: 2619: 2614: 2609: 2604: 2602:Marianna Fault 2598: 2596: 2592: 2591: 2589: 2588: 2586:Wilzetta Fault 2583: 2578: 2573: 2568: 2566:Humboldt Fault 2563: 2557: 2555: 2551: 2550: 2548: 2547: 2542: 2537: 2532: 2526: 2524: 2520: 2519: 2517: 2516: 2506: 2501: 2496: 2491: 2486: 2481: 2476: 2470: 2468: 2464: 2463: 2461: 2460: 2455: 2441: 2436: 2430: 2428: 2421: 2417: 2416: 2414: 2413: 2408: 2403: 2398: 2393: 2388: 2383: 2378: 2372: 2370: 2366: 2365: 2363: 2362: 2356: 2350: 2344: 2338: 2332: 2326: 2320: 2314: 2308: 2302: 2296: 2289: 2287: 2281: 2280: 2268: 2267: 2260: 2253: 2245: 2239: 2238: 2232: 2227: 2222: 2217: 2212: 2206: 2201: 2195: 2173: 2168: 2163: 2155: 2154:External links 2152: 2151: 2150: 2102: 2099: 2097: 2096: 2080: 2067: 2053: 2024: 2009: 1958: 1923: 1888: 1871:(4): 426–431, 1853: 1837: 1824: 1795: 1782: 1750: 1699: 1667: 1635: 1621: 1584: 1536: 1499: 1484: 1468: 1455: 1426: 1423:Seattle Weekly 1418: 1367: 1354: 1317: 1298:(2): 105–125, 1280: 1247:(2): 169–177, 1229: 1216: 1165: 1145: 1125: 1123: 1120: 1118: 1117: 1101: 1089: 1077: 1065: 1053: 1041: 1029: 1020: 1008: 992: 976: 960: 948: 936: 920: 904: 888: 876: 864: 852: 841: 825: 813: 797: 785: 773: 761: 750: 730: 718: 702: 644: 632: 620: 608: 596: 584: 571: 569: 566: 565: 564: 559: 552: 549: 545:Puyallup River 502:Pioneer Square 478:Cape Mendocino 442:Port-au-Prince 433: 430: 361:Lake Sammamish 314: 311: 271:marine terrace 260: 257: 219: 218: 212: 206: 205: 202: 196: 195: 190: 184: 183: 175: 169: 168: 165: 161: 160: 158:North American 155: 149: 148: 144: 143: 140: 136: 135: 130: 126: 125: 121: 120: 115: 111: 110: 105: 101: 100: 97: 93: 92: 60: 54: 53: 48: 44: 43: 32: 24: 23: 15: 9: 6: 4: 3: 2: 2773: 2762: 2759: 2757: 2754: 2752: 2749: 2748: 2746: 2739: 2729: 2726: 2724: 2721: 2718: 2717:Motagua Fault 2715: 2712: 2709: 2707: 2704: 2702: 2699: 2696: 2693: 2691: 2688: 2686: 2685:Cayman Trough 2683: 2682: 2680: 2676: 2666: 2663: 2661: 2658: 2656: 2653: 2650: 2646: 2643: 2641: 2638: 2636: 2633: 2632: 2630: 2624: 2618: 2615: 2613: 2610: 2608: 2605: 2603: 2600: 2599: 2597: 2593: 2587: 2584: 2582: 2579: 2577: 2574: 2572: 2569: 2567: 2564: 2562: 2559: 2558: 2556: 2552: 2546: 2545:Wasatch Fault 2543: 2541: 2538: 2536: 2533: 2531: 2528: 2527: 2525: 2521: 2514: 2510: 2507: 2505: 2502: 2500: 2497: 2495: 2492: 2490: 2487: 2485: 2482: 2480: 2479:Garlock Fault 2477: 2475: 2472: 2471: 2469: 2465: 2459: 2456: 2453: 2449: 2448:Seattle Fault 2445: 2442: 2440: 2437: 2435: 2432: 2431: 2429: 2425: 2422: 2420:United States 2418: 2412: 2409: 2407: 2404: 2402: 2399: 2397: 2394: 2392: 2389: 2387: 2384: 2382: 2379: 2377: 2374: 2373: 2371: 2367: 2360: 2359:Tintina Fault 2357: 2354: 2351: 2348: 2345: 2342: 2339: 2336: 2333: 2330: 2327: 2324: 2321: 2318: 2315: 2312: 2309: 2306: 2303: 2300: 2297: 2294: 2291: 2290: 2288: 2284:North America 2282: 2277: 2274: 2266: 2261: 2259: 2254: 2252: 2247: 2246: 2243: 2236: 2233: 2231: 2228: 2226: 2223: 2221: 2218: 2216: 2213: 2210: 2207: 2205: 2202: 2199: 2196: 2187:on 2005-02-22 2186: 2182: 2181:Seattle Times 2178: 2174: 2172: 2169: 2167: 2164: 2161: 2158: 2157: 2147: 2143: 2139: 2135: 2131: 2127: 2123: 2119: 2115: 2111: 2105: 2104: 2093: 2086: 2081: 2077: 2073: 2068: 2061: 2060: 2054: 2051: 2047: 2043: 2039: 2035: 2031: 2025: 2022: 2015: 2010: 2007: 2003: 1999: 1995: 1991: 1987: 1983: 1979: 1976:: 1620–1621, 1975: 1971: 1964: 1959: 1956: 1952: 1948: 1944: 1940: 1936: 1929: 1924: 1921: 1917: 1913: 1909: 1905: 1901: 1894: 1889: 1886: 1882: 1878: 1874: 1870: 1866: 1859: 1854: 1850: 1843: 1838: 1834: 1830: 1825: 1822: 1818: 1814: 1810: 1806: 1802: 1796: 1792: 1788: 1783: 1780: 1776: 1772: 1768: 1764: 1760: 1756: 1751: 1748: 1744: 1740: 1736: 1732: 1728: 1724: 1720: 1717:: 1617–1620, 1716: 1712: 1705: 1700: 1697: 1693: 1689: 1685: 1681: 1677: 1673: 1668: 1665: 1661: 1657: 1653: 1649: 1645: 1641: 1636: 1633: 1632: 1627: 1622: 1618: 1613: 1609: 1605: 1601: 1597: 1590: 1585: 1582: 1578: 1574: 1570: 1566: 1562: 1558: 1554: 1551:: 1621–1623, 1550: 1546: 1542: 1537: 1533: 1528: 1524: 1520: 1516: 1512: 1505: 1500: 1497: 1490: 1485: 1481: 1474: 1469: 1465: 1461: 1456: 1453: 1449: 1445: 1441: 1437: 1433: 1427: 1424: 1419: 1416: 1412: 1408: 1404: 1400: 1396: 1392: 1388: 1385:: 1611–1614, 1384: 1380: 1373: 1368: 1364: 1360: 1355: 1351: 1346: 1342: 1338: 1334: 1330: 1323: 1318: 1314: 1309: 1305: 1301: 1297: 1293: 1286: 1281: 1278:on 2019-10-21 1274: 1270: 1266: 1262: 1258: 1254: 1250: 1246: 1242: 1235: 1230: 1224: 1223: 1217: 1214: 1210: 1206: 1202: 1198: 1194: 1190: 1186: 1182: 1178: 1171: 1166: 1163: 1159: 1155: 1151: 1146: 1142: 1138: 1134: 1133: 1127: 1126: 1114: 1110: 1105: 1098: 1093: 1086: 1081: 1074: 1069: 1062: 1057: 1050: 1045: 1038: 1033: 1024: 1017: 1012: 1005: 1001: 996: 989: 985: 980: 973: 969: 964: 957: 952: 945: 940: 933: 929: 924: 917: 913: 908: 901: 897: 892: 885: 880: 873: 868: 861: 856: 850: 845: 838: 834: 829: 822: 817: 810: 806: 801: 794: 789: 782: 777: 770: 765: 759: 754: 747: 743: 739: 734: 728: 722: 715: 711: 706: 698: 694: 689: 684: 680: 676: 672: 668: 664: 660: 656: 648: 641: 636: 629: 624: 617: 612: 605: 600: 593: 588: 581: 576: 572: 563: 560: 558: 555: 554: 548: 546: 542: 538: 534: 529: 524: 518: 513: 509: 507: 503: 499: 495: 491: 485: 483: 479: 475: 471: 467: 463: 459: 455: 454:Olympia Fault 451: 443: 438: 429: 427: 423: 419: 414: 412: 407: 405: 401: 397: 392: 389: 385: 381: 377: 373: 368: 366: 362: 358: 354: 350: 349:thrust faults 345: 341: 333: 327: 319: 310: 308: 304: 294: 290: 288: 284: 280: 276: 272: 266: 256: 254: 250: 246: 242: 238: 234: 230: 229:thrust faults 226: 225:Seattle Fault 216: 213: 211: 207: 203: 201: 197: 194: 191: 189: 185: 182: 176: 174: 170: 166: 162: 159: 156: 154: 150: 145: 141: 137: 134: 131: 127: 122: 119: 116: 112: 109: 106: 102: 99:United States 98: 94: 89: 61: 59: 55: 52: 49: 45: 40: 36: 30: 25: 22:Seattle Fault 20: 2738: 2660:Ramapo Fault 2554:Great Plains 2452:Tacoma Fault 2447: 2323:Denali Fault 2189:, retrieved 2185:the original 2180: 2113: 2109: 2091: 2075: 2071: 2058: 2036:(1): 26–44, 2033: 2030:GSA Bulletin 2029: 2020: 1973: 1969: 1938: 1934: 1903: 1900:GSA Bulletin 1899: 1868: 1864: 1848: 1832: 1804: 1801:GSA Bulletin 1800: 1790: 1762: 1759:GSA Bulletin 1758: 1714: 1710: 1682:(1): 71–74, 1679: 1675: 1647: 1644:GSA Bulletin 1643: 1630: 1599: 1595: 1548: 1544: 1514: 1510: 1495: 1479: 1463: 1435: 1431: 1422: 1382: 1378: 1362: 1332: 1328: 1295: 1291: 1273:the original 1244: 1241:GSA Bulletin 1240: 1221: 1180: 1176: 1153: 1149: 1131: 1111:, § 3; 1104: 1092: 1080: 1068: 1056: 1044: 1032: 1023: 1011: 1006:, p. 8. 995: 979: 963: 951: 939: 934:, pp.26, 43. 923: 914:, p.27,481; 907: 891: 886:, § 72. 879: 867: 855: 844: 837:Liberty 2009 828: 816: 800: 788: 776: 764: 753: 740:, p.27,471; 733: 721: 705: 662: 658: 647: 635: 623: 611: 599: 587: 575: 562:Tacoma Fault 525: 521: 498:Capitol Hill 486: 462:Benioff zone 447: 425: 415: 408: 393: 388:Tacoma Fault 369: 357:aeromagnetic 337: 303:Psai-Yah-hus 299: 274: 268: 224: 222: 193:Thrust fault 2576:Meers Fault 2540:Teton Fault 2523:Great Basin 2458:Walker Lane 2444:Puget Sound 1517:(6): 4–10, 898:. See also 862:, p.13,558. 714:Buerge 1985 533:Elliott Bay 173:Earthquakes 83: / 71:122°19′59″W 58:Coordinates 35:Puget Sound 2745:Categories 2535:Moab Fault 2467:California 2191:2019-01-15 1156:(2): 232, 1075:, p. 1613. 1063:, p. 1596. 986:, p.1588; 970:, p.1619; 504:, and the 422:Alki Point 380:Hood Canal 307:Fauntleroy 279:Alki Point 263:See also: 249:earthquake 241:Washington 237:U.S. state 108:Washington 68:47°36′36″N 2146:251698220 2138:0037-1106 1596:Tectonics 1511:GSA Today 1292:Geosphere 1269:128977256 1087:, p. 872. 958:, p.1389. 835:, p.118; 807:, p.170; 748:, p.1389. 484:, slips. 372:Fall City 305:near the 147:Tectonics 47:Etymology 37:and into 2006:34847168 1998:17742528 1739:17742527 1581:35721127 1573:17742529 1415:39423769 1407:17742525 1213:34602506 1205:17742526 918:, p.169. 823:, GM-73. 795:, p.170. 744:, p.72; 697:37756412 688:10530078 551:See also 541:Duwamish 416:Surface 340:Tertiary 235:(in the 200:Movement 2595:Midwest 2361:(US–CA) 2355:(US–CA) 2349:(US–MX) 2343:(US–MX) 2337:(US–CA) 2331:(CA–US) 2325:(US–CA) 2319:(US–CA) 2313:(US–CA) 2307:(CA–GL) 2301:(US–MX) 2295:(US–RU) 2118:Bibcode 2038:Bibcode 1978:Bibcode 1970:Science 1943:Bibcode 1908:Bibcode 1873:Bibcode 1809:Bibcode 1767:Bibcode 1747:8354010 1719:Bibcode 1711:Science 1684:Bibcode 1676:Geology 1652:Bibcode 1604:Bibcode 1553:Bibcode 1545:Science 1519:Bibcode 1440:Bibcode 1387:Bibcode 1379:Science 1337:Bibcode 1300:Bibcode 1249:Bibcode 1185:Bibcode 1177:Science 1137:Bibcode 1122:Sources 1039:, p.11. 667:Bibcode 476:, from 404:plutons 313:Geology 275:Science 233:Seattle 204:Reverse 129:Part of 118:Seattle 96:Country 51:Seattle 39:Seattle 2697:(Cuba) 2369:Canada 2276:faults 2271:Major 2144:  2136:  2004:  1996:  1745:  1737:  1579:  1571:  1413:  1405:  1267:  1211:  1203:  1018:, p.9. 695:  685:  432:Hazard 418:scarps 396:Eocene 344:basalt 215:Eocene 181:900 CE 167:Active 164:Status 139:Length 114:Cities 2142:S2CID 2088:(PDF) 2063:(PDF) 2017:(PDF) 2002:S2CID 1966:(PDF) 1931:(PDF) 1896:(PDF) 1861:(PDF) 1845:(PDF) 1743:S2CID 1707:(PDF) 1592:(PDF) 1577:S2CID 1507:(PDF) 1492:(PDF) 1476:(PDF) 1411:S2CID 1375:(PDF) 1325:(PDF) 1288:(PDF) 1276:(PDF) 1265:S2CID 1237:(PDF) 1226:(PDF) 1209:S2CID 1173:(PDF) 727:GM-52 568:Notes 411:LIDAR 378:, to 153:Plate 104:State 2134:ISSN 2078:: 88 1994:PMID 1735:PMID 1569:PMID 1496:NOAA 1403:PMID 1201:PMID 693:PMID 355:and 223:The 188:Type 2126:doi 2114:112 2046:doi 1986:doi 1974:258 1951:doi 1939:102 1916:doi 1904:115 1881:doi 1817:doi 1805:120 1775:doi 1763:116 1727:doi 1715:258 1692:doi 1660:doi 1648:111 1612:doi 1561:doi 1549:258 1527:doi 1448:doi 1395:doi 1383:258 1345:doi 1333:106 1308:doi 1257:doi 1245:114 1193:doi 1181:258 1158:doi 683:PMC 675:doi 543:or 480:to 239:of 210:Age 2747:: 2450:, 2179:, 2140:. 2132:. 2124:. 2112:. 2090:, 2076:24 2074:, 2044:, 2034:95 2032:, 2019:, 2000:, 1992:, 1984:, 1972:, 1968:, 1949:, 1937:, 1933:, 1914:, 1902:, 1898:, 1879:, 1869:76 1867:, 1863:, 1847:, 1831:, 1815:, 1803:, 1789:, 1773:, 1761:, 1757:, 1741:, 1733:, 1725:, 1713:, 1709:, 1690:, 1680:22 1678:, 1674:, 1658:, 1646:, 1642:, 1610:, 1600:23 1598:, 1594:, 1575:, 1567:, 1559:, 1547:, 1543:, 1525:, 1515:13 1513:, 1509:, 1494:, 1478:, 1462:, 1446:, 1436:70 1434:, 1409:, 1401:, 1393:, 1381:, 1377:, 1361:, 1343:, 1331:, 1327:, 1306:, 1294:, 1290:, 1263:, 1255:, 1243:, 1239:, 1207:, 1199:, 1191:, 1179:, 1175:, 1154:70 1152:, 1135:, 930:; 712:; 691:. 681:. 673:. 661:. 657:. 508:. 500:, 342:) 287:CE 255:. 179:c. 2651:) 2647:( 2515:) 2511:( 2454:) 2446:( 2264:e 2257:t 2250:v 2148:. 2128:: 2120:: 2048:: 2040:: 1988:: 1980:: 1953:: 1945:: 1918:: 1910:: 1883:: 1875:: 1819:: 1811:: 1777:: 1769:: 1729:: 1721:: 1694:: 1686:: 1662:: 1654:: 1614:: 1606:: 1563:: 1555:: 1529:: 1521:: 1450:: 1442:: 1397:: 1389:: 1347:: 1339:: 1310:: 1302:: 1296:5 1259:: 1251:: 1195:: 1187:: 1160:: 1139:: 1115:. 1099:. 990:. 974:. 946:. 902:. 839:. 811:. 783:. 771:. 716:. 699:. 677:: 669:: 663:9 642:. 630:. 618:. 606:. 594:. 582:. 334:)

Index


Puget Sound
Seattle
Seattle
Coordinates
47°36′36″N 122°19′59″W / 47.610°N 122.333°W / 47.610; -122.333
Washington
Seattle
Puget Sound faults
Plate
North American
Earthquakes
c. 900 CE
Type
Thrust fault
Movement
Age
Eocene
thrust faults
Seattle
U.S. state
Washington
Interstate Highway 90
earthquake
regional system of faults
Lake Washington sunken forests
marine terrace
Alki Point
tsunami deposits
CE

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