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Segula is made up of overlapping strata of lava flows and pyroclastic deposits, built up from the caldera. Largely built of eruptive material, the stratovolcano is conical and marked by a fissure. Since it is surrounded by lava flows on the north flank and a
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on the southern and eastern flanks and a submarine deposit to the north of the summit which extends for 11 miles (18 km) have very little erosion, making it likely that Segula has erupted in the last few hundred years.
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on the other, the mountain's caldera, or main crater, appears tiny and is therefore very difficult to make out from any photographs. The north side of the island is summarized by sharp
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and a shallow reef which together make accessibility from that side difficult. It has not had a recorded eruption, though numerous deposits of lava flows and other
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lava and pyroclastic material was ejected from the underwater crater, building up over time to break the surface from nearly 350 feet (107 m) underwater.
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and the volcano formed over an underwater land surface which hosts other
Aleutian volcanoes such as
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Built on top of a shallow platform, the volcano grew steadily from eruptions, and is composed of
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W.H. Nelson (1956), "Geology of Segula, Davidof and
Khvostof Islands, Alaska",
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316:"Geology of Segula, Davidof and Khvostof Islands Alaska"
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383:Landforms of Aleutians West Census Area, Alaska
122:lies 1,228 miles (1,976 km) westward of
113:Unrecorded, within the last few hundred years
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393:Volcanoes of Unorganized Borough, Alaska
262:United States Geological Survey Bulletin
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388:Stratovolcanoes of the United States
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398:Cinder cones of the United States
378:Volcanoes of the Aleutian Islands
266:United States Geological Survey
232:United States Geological Survey
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34:3,783 ft (1,153 m)
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227:Alaska Volcano Observatory
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289:Global Volcanism Program
294:Smithsonian Institution
222:"Segula - Introduction"
134:of Alaska. An inactive
47:North Pacific, part of
354:52.01528°N 178.13667°E
165:to as far east as the
314:Nelson, W.H. (1959).
153:Geography and geology
145:of flow deposits and
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322:. Retrieved
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299:December 19,
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163:Kiska Island
157:Part of the
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102:Aleutian Arc
57:Parent range
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345:178°08′12″E
193:cinder cone
159:Rat Islands
147:pyroclastic
63:Rat Islands
372:Categories
342:52°00′55″N
208:References
149:material.
185:Andesitic
124:Anchorage
91:Volcanic
65:(part of
39:Geography
30:Elevation
284:"Segula"
177:Khvostof
44:Location
324:18 June
181:Davidof
130:in the
126:on the
74:Geology
234:. 2009
201:ejecta
197:cliffs
143:strata
49:Alaska
319:(PDF)
326:2018
301:2009
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