미국 · 성층화산
Mount Vsevidof
Vsevidof
- 화산 유형
- 성층화산
- 해발
- 2160m
- 마지막 분화
- 1878년
- 화산 유형
- 성층화산
- 국가
- 미국
- 지역
- 북아메리카 / Aleutian Ridge Volcanic Arc
- 해발
- 2160m
- 좌표
- 53.126, -168.688
- 마지막 분화
- 1878년
- 판구조 환경
- 섭입대 / 중간 지각 (15-25 km)
- 화산 지형
- 복성화산체
- 주요 암석
- 안산암 / 현무암질 안산암
지질학적 요약
The symmetrical Vsevidof stratovolcano, near the SW end of Umnak Island, contains a 1.2-km-wide, ice-filled summit crater that is breached by glaciers on the E and N sides. An E-W-trending zone of scoria cones that extends down much of the W flank has been the source of recorded eruptions. Most of the cone was constructed during the Holocene. Andesitic and dacitic lava flows originated from vents on the N and S flanks, and on the W-flank rift. The largest lava flow traveled down the W flank to the coast, forming Cape Kigushimkada.
Wikipedia 요약
영어 요약Mount Vsevidof is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings. The base of the volcano is around 10 km (6 mi) wide, steepening from about 15 degrees at 300 m (980 ft) altitude to around 30 degrees near the summit. Some glacial tongues have cut through narrow canyons up to 120 m (390 ft) deep, due to ice filling the crater and extending down the north and east flanks of the cone. It is most likely that Mount Vsevidof has not erupted in historic time. Reports of its latest eruption in 1957 is considered questionable by the Alaska Volcano Observatory. This also includes possible eruptions or activity which may have occurred at the volcano in 1784, 1790, 1830, 1878, and 1880.
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분화 이력
7건 기록용어집상세 타임라인
- 1957년VEI 2근거 미기재1957-03-11 ~ 1957-03-12West flank fissure
- 1880년VEI ?근거 미기재1880-07-02 ~ 종료일 미상
- 1878년VEI 2관측 기록1878-07-02 ~ 종료일 미상West flank fissure ?
- 1830년VEI ?관측 기록1830-07-02 ~ 종료일 미상SW end of Umnak Island
- 1817년VEI 3관측 기록1817-07-02 ~ 종료일 미상
- 1790년VEI ?근거 미기재1790-05-30 ~ 종료일 미상
- 1784년VEI ?근거 미기재1784 ~ 종료일 미상
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