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Lwandle Plate

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1055: 20: 214: 1677: 1701: 179:– To the east, the boundary may be more of a diffuse boundary. There are current studies trying to pinpoint the exact location of this boundary; it is believed to cut across Madagascar, making it Lwandle's only boundary that is not purely oceanic. Earthquake slip vectors are the primary constraint that predict the actual plate boundaries. Velocity predicted at this boundary is 1.3–1.4 mm/yr. This boundary separates Lwandle from the Somali Plate. 1689: 1713: 210:
this area wouldn't have much seismic activity. The data supports this expectation. Though Lwandle is moving faster relative to the Antarctic plate than to Nubian and Somali, this spreading ridge is one of the slowest on planet Earth, spreading at less than half the rate of human fingernail growth. It appears that Lwandle will be in its current position for quite some time.
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GPS data paired with earthquake slip data is used to estimate the velocity of the Lwandle Plate and its neighbors. The velocity of the Lwandlean Plate, relative to the Nubian and Somali plates, is estimated to be a very slow rate (1–2 mm/yr). With these low rates of motion, it is expected that
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strongly suggests that motion exists. Some models suggest it is a right-lateral strike slip boundary with a rate of about 1 mm/yr, with some extension. Still, others even suggest that motion ceased at this boundary approximately 11 million years ago. This boundary separates Lwandle from the
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There have been very few studies that directly study the Lwandlean Plate. Previous studies about Lwandle have primarily been focused on attempting to quantify the mechanics of the African Rift System. For this reason, the presumed evolution and formation of the microplates are not well known.
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occur most often at plate boundaries and have been used as a guide to predict the locations of multiple plate boundaries. “Lwandle’s” existence was postulated after studying earthquake data in areas that were once assumed to be the interiors of the Nubian and Somali plates. By including the
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system, 22–25 million years ago, resulted in the splitting of the African Plate into 2 smaller plates – the Somali Plate and the Nubian Plate. However, most recently, through the application of GPS technology and integration of earthquake data, it was discovered that the rift created three
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The East African Rift, where three plates are pulling away from one another: the Arabian Plate and two parts of the African Plate—the Nubian and Somali—which eventually led to the formation of the Lwandle plate as well as other microplates. The Afar Triangle, shaded at the center, is a
47:. Its discovery is very recent, so the velocity of the plate is neither well known nor well understood. Many experiments are ongoing to quantify this. The Lwandle Plate lies between 30°E and 50°E, sharing a boundary with the Nubian, Somali, and 97:
technology and data was also introduced in an effort to show with certainty the difference between the Somali Plate and the Nubian Plate. Using the GPS data, researchers could measure the velocity of tectonic plates from their interiors.
105:. Mathematical plate circuit closure is attained while including the existence of Lwandle; using plate circuit closure, plate velocities can be calculated from the velocities of other plates. 108:
In 2008, the entire East African Rift System was successfully "quantified" through the integration of the GPS and earthquake data with the spreading rate and transform azimuth constraints.
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Kelleher, John; Sykes, Lynn; Oliver, Jack (1973). "Possible criteria for predicting earthquake locations and their application to major plate boundaries of the Pacific and the Caribbean".
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The existence of the Lwandle Plate was first quantified using the Lwandle-Antarctica-Nubia plate circuit closure constrained by spreading rates and transform azimuths along the
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Stamps, Sarah; Rambolamanana, Gerard; Calais, Eric; Rajaonarison, Tahiry. "Geodetic Constraints of Rift Initiation Across the Somalia-Lwandle Plate Boundary in Madagascar".
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Lwandlean Plate in their calculation, researchers were able to more accurately solve for the intersection between the East African Rift and the Southwest Indian Ridge.
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Patriat, Philippe; Sloan, Heather; Sauter, Daniel (October 2014). "From slow to ultraslow: A previously undetected event at the Southwest Indian Ridge at ca. 24 Ma".
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with a slow spreading rate of about 12–18 mm/yr, acts as the southern boundary. This spreading ridge separates Lwandle from the Antarctic plate.
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Kinematics of the East African Rift from GPS and earthquake slip vector data, in The Afar Volcanic Province Within the East African Rift System
394:"Plate kinematic evidence for the existence of a distinct plate between the Nubian and Somalian plates along the Southwest Indian Ridge" 977: 872:
Lemaux, James; Gordon, Richard; Royer, Jean-Yves (2002). "Location of the Nubia-Somalia boundary along the Southwest Indian Ridge".
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Lwandle was assumed to be part of the Somali plate, at first. Here are two models that show how thinking about Lwandle has evolved.
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The Lwandle Plate is largely oceanic, lying off the southeast coast of Africa. It is currently believed that the southern part of
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Hartnady, C.J.H. (2002). "Earthquake hazard in Africa : perspectives on the Nubia-Somalia boundary : news and view".
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Chu, Dezhi; Gordon, Richard (1999). "Evidence for motion between Nubia and Somalia along the Southwest Indian ridge".
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Lwandle and its neighboring plates are shown. This figure is simplified, modified from Stamps et al. 2008.
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forms part of the Lwandlean Plate, with one of the plate boundaries cutting through the island.
1650: 1612: 1607: 1590: 1344: 549:; Ebinger, C.J.; Hartnady, C.; Nocquet, J.M. Yirgu, G.; Ebinger, C.J.; Maguire, P.K.H. (eds.). 102: 1017: 306: 19: 1525: 1447: 1437: 1384: 1379: 1319: 1184: 1121: 1044: 1034: 881: 838: 801: 727: 686: 637: 573: 461: 405: 361: 273: 146: 1224: 444:
Stamps, D. Sarah; Calais, Eric; Saria, Elifuraha; Hartnady, Chris; Nocquet, Jean-Mathieu;
8: 1640: 1409: 1174: 936:"Ultra Slow Spreading Ridges and Oceanic Core Complexes: Big Mountains and Bigger Faults" 715: 885: 842: 805: 767:(2nd ed., repr. with corrections. ed.). Cambridge, UK: Cambridge University Press. 731: 690: 641: 623:"Crustal velocity field of western Europe from permanent GPS array solutions, 1996–2001" 577: 465: 409: 365: 277: 1655: 1645: 1570: 1565: 1462: 1309: 1254: 1111: 854: 745: 655: 162:
The majority of Lwandle's plate boundaries are not well understood. What is known is:
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additional “microplates” – the Lwandle Plate, Victoria Plate, and Rovuma Plate.
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Horner-Johnson, Benjamin; Gordon, Richard; Cowles, Sara; Argus, Donald (2005).
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Calais, E.; Dong, L.; Wang, M.; Shen, Z.; Vergnolle, M. (October 2006).
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Horner-Johnson, Benjamin; Gordon, Richard; Argus, Donald (May 2007).
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In this model, Lwandle is considered to be part of the Somali Plate.
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Mainly oceanic tectonic microplate off the southeast coast of Africa
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Red arrows show the relative plate velocity at that boundary
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10.1130/0091-7613(2002)030<0339:lotnsb>2.0.co;2
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The solid earth : an introduction to global geophysics
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along this boundary. Despite that, a misfit to a seafloor
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For many years it was widely accepted that rifting in the
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Altamimi, Z.; MĂ©tivier, L.; Collilieux, X. (July 2012).
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DeMets, Charles; Gordon, Richard; Argus, Donald (2010).
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is one of three tectonic microplates, along with the
515:"Continental break-up: the East African perspective" 781: 563: 144:In this model, Lwandle is its own, separate plate. 906: 713: 871: 347: 262:"Present-day kinematics of the East African Rift" 61: 1731: 756: 940:National Oceanic and Atmospheric Administration 971: 620: 450:"A kinematic model for the East African Rift" 707: 503: 266:Journal of Geophysical Research: Solid Earth 255: 253: 251: 249: 247: 169:– The Southwest Indian Ridge, an ultra-slow 597: 595: 1688: 978: 964: 822: 343: 341: 339: 337: 335: 333: 331: 329: 39:, that make up the African Plate with the 828: 813: 739: 698: 649: 530: 473: 417: 387: 385: 373: 285: 244: 666: 621:Nocquet, J.-M.; Calais, E. (June 2003). 601: 592: 439: 437: 435: 433: 431: 429: 212: 145: 135: 65: 18: 933: 900: 614: 557: 509: 326: 129:Tectonic Model Including Lwandle Plate 1732: 865: 762: 482: 382: 126:Tectonic Model Excluding Lwandle Plate 959: 539: 426: 259: 1712: 927: 350:"Geologically current plate motions" 985: 204: 13: 14: 1751: 794:Geophysical Journal International 630:Geophysical Journal International 157: 1711: 1700: 1699: 1687: 1675: 1053: 815:10.1111/j.1365-246X.2005.02608.x 651:10.1046/j.1365-246X.2003.01935.x 604:South African Journal of Science 532:10.1111/j.1468-4004.2005.46216.x 375:10.1111/j.1365-246X.2009.04491.x 75:that separates the three plates. 679:Journal of Geophysical Research 566:Journal of Geophysical Research 398:Journal of Geophysical Research 1603:South American–Antarctic Ridge 934:Cheadle, Mike; John, Barbara. 294: 62:Discovery of the Lwandle Plate 1: 675:"ITRF2008 plate motion model" 238: 720:Geophysical Research Letters 454:Geophysical Research Letters 448:; Fernandes, Rui M. (2008). 115: 7: 221: 10: 1756: 1556:Galápagos Spreading Center 1669: 1621: 1506: 1423: 1150: 1062: 1051: 993: 490:"U.S. Geological Survey" 1598:Pacific-Antarctic Ridge 763:Fowler, C.M.R. (2006). 586:10.1029/JB078i014p02547 260:Saria, E (April 2014). 228:List of tectonic plates 1651:Pacific-Farallon Ridge 1623:Ancient oceanic ridges 1613:Southwest Indian Ridge 1608:Southeast Indian Ridge 1345:Philippine Mobile Belt 610:(9 & 10): 425–428. 314:Cite journal requires 218: 150: 140: 103:Southwest Indian Ridge 76: 24: 216: 149: 139: 69: 22: 1526:Central Indian Ridge 741:10.1029/2006GL028433 700:10.1029/2011JB008930 475:10.1029/2007GL032781 419:10.1029/2006JB004519 287:10.1002/2013JB010901 1641:Kula-Farallon Ridge 886:2002Geo....30..339L 843:1999Natur.398...64C 806:2005GeoJI.162..221H 732:2006GeoRL..3324319C 691:2012JGRB..117.7402A 642:2003GeoJI.154...72N 578:1973JGR....78.2547K 466:2008GeoRL..35.5304S 446:Ebinger, Cynthia J. 410:2007JGRB..112.5418H 366:2010GeoJI.181....1D 278:2014JGRB..119.3584S 1682:Geology portal 1656:Pacific-Kula Ridge 1646:Mid-Labrador Ridge 1571:Mid-Atlantic Ridge 1566:Juan de Fuca Ridge 219: 151: 141: 77: 25: 1727: 1726: 1541:East Pacific Rise 921:10.1130/G24270A.1 572:(14): 2547–2585. 198:Northern boundary 167:Southern boundary 155: 154: 81:East African Rift 1747: 1715: 1714: 1703: 1702: 1691: 1690: 1680: 1679: 1581:Kolbeinsey Ridge 1057: 980: 973: 966: 957: 956: 951: 950: 948: 946: 931: 925: 924: 904: 898: 897: 869: 863: 862: 826: 820: 819: 817: 785: 779: 778: 760: 754: 753: 743: 711: 705: 704: 702: 670: 664: 663: 653: 627: 618: 612: 611: 599: 590: 589: 561: 555: 554: 543: 537: 536: 534: 525:(2): 2.16–2.21. 507: 501: 500: 498: 496: 486: 480: 479: 477: 441: 424: 423: 421: 389: 380: 379: 377: 345: 324: 323: 317: 312: 310: 302: 298: 292: 291: 289: 272:(4): 3584–3600. 257: 205:Modern movements 191:magnetic anomaly 187:seismic activity 183:Western boundary 177:Eastern boundary 123: 122: 49:Antarctic Plates 1755: 1754: 1750: 1749: 1748: 1746: 1745: 1744: 1740:Tectonic plates 1730: 1729: 1728: 1723: 1674: 1665: 1617: 1591:Reykjanes Ridge 1576:Knipovich Ridge 1521:Carlsberg Ridge 1502: 1419: 1325:North Galápagos 1146: 1058: 1049: 1018:Indo-Australian 989: 987:Tectonic plates 984: 954: 944: 942: 932: 928: 905: 901: 870: 866: 837:(6722): 64–67. 827: 823: 786: 782: 775: 761: 757: 712: 708: 671: 667: 625: 619: 615: 600: 593: 562: 558: 544: 540: 519:Astron. 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Index


Rovuma Plate
Victoria Plate
Somali Plate
Nubian Plate
Antarctic Plates
Madagascar

triple junction
East African Rift
Earthquakes
GPS
Southwest Indian Ridge


spreading ridge
seismic activity
magnetic anomaly

List of tectonic plates
Plate tectonics





"Present-day kinematics of the East African Rift"
Bibcode
2014JGRB..119.3584S
doi

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