Video and seismic observations of Strombolian eruptions at Erebus volcano,Antarctica |
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| Authors: | RR Dibble PR Kyle CA Rowe |
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| Institution: | 1. Research School of Earth Science, Victoria University, Wellington, New Zealand;2. 81 Oriel Avenue, Tawa, Wellington, New Zealand;3. Department of Earth & Environmental Science, NM Tech, Socorro, NM 87801, USA;4. Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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| Abstract: | Between 1986 and 1990 the eruptive activity of Erebus volcano was monitored by a video camera with on-screen time code and recorded on video tape. Corresponding seismic and acoustic signals were recorded from a network of 6 geophones and 2 infrasonic microphones. Two hundred Strombolian explosions and three lava flows which were erupted from 7 vents were captured on video. In December 1986 the Strombolian eruptions ejected bombs and ash. In November 1987 large bubble-bursting Strombolian eruptions were observed. The bubbles burst when the bubble walls thinned to ∼ 20 cm. Explosions with bomb flight-times up to 14.5 s were accompanied by seismic signals with our local size estimate, “unified magnitudes” (mu), up to 2.3. Explosions in pools of lava formed by flows in the Inner Crater were comparatively weak. |
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| Keywords: | Erebus volcano Antarctica seismology video surveillance Strombolian eruptions |
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