Caldera Collapse in the Galápagos Islands, 1968

American Association for the Advancement of Science (AAAS) - Tập 169 Số 3944 - Trang 429-437 - 1970
Tom Simkin1, Keith A. Howard2
1Smithsonian Institution, Washington, D.C. 20560
2U. S. Geological Survey, Menlo Park, California 94025

Tóm tắt

The summit caldera of Isla Fernandina, a large, uninhabited basaltic shield volcano, was further enlarged by 1 to 2 km 3 in June 1968. A small quake and large vapor cloud on 11 June were followed 4 hours later by a remarkable volcanic ash cloud and, after another hour, by a major explosion recorded at infrasonic stations throughout the hemisphere. Seismic activity increased to a peak on 19 June, when more than 200 events per day were recorded by a seismograph 140 km away. Several hundred quakes were in the magnitude range 4.0 to 5.4 m b , but few such events were recorded after 23 June. Unusual lightning accompanied the major cloud, and, during the evening of 11 June, distant observers reported red glow and flashes from the area. Fine ash fell that night and much of the next day to distances at least 350 km from the volcano.

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American Association for the Advancement of Science (AAAS)

Tập 169 Số 3944

429-437

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