HR: 1340h
AN: S43A-1034    [Abstracts]
TI: Eruption seismicity of Bezymianny Volcano, Kamchatka, Russia
AU: * West, M
EM: west@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, United States
AU: Senyukov, S
EM: ssl@emsd.iks.ru
AF: Kamchatka Branch of Geophysical Services, Institute of Volcanology and Seismology, Petropavlovsk, Kamchatka, Russian Federation
AU: Chebrov, V
EM: chebr@emsd.iks.ru
AF: Kamchatka Branch of Geophysical Services, Institute of Volcanology and Seismology, Petropavlovsk, Kamchatka, Russian Federation
AU: Thelen, W
EM: wethelen@ess.washington.edu
AF: Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, United States
AU: Nikulin, A
EM: alnikulin@gmail.com
AF: Department of Geological Sciences, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, United States
AU: Buurman, H
EM: helena@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, United States
AB: Seismic activity at Bezymianny volcano is currently being studied via a two-pronged approach. Real-time telemetered data from an increasingly dense short-period seismic network is analyzed by the Kamchatka Branch of Geophysical Services (KBGS; Russian Academy of Science Far East Division). This network is currently being supplemented by a campaign-style broadband array supported by the NSF Partners in Research and Education (PIRE) program. The combination of these networks is beginning to provide research-grade seismic data from Bezymianny's twice annual plinian eruptions. The St. Helens-like sector collapse and eruption of Bezymianny in 1956 (VEI 5) heralded the beginning of what has evolved into one of the most regular, and predictable, sequences of explosive eruptions in the world. Seismic data, as well as thermal remote sensing data, follow a repeatable pre-eruption sequence which has been exploited by KBGS to provide accurate forecasts days before impending eruptions. This remarkable pattern strongly suggests that the mechanics of recent Bezymianny eruptions are stable and long-lived. The implication of a robust, largely self-regulating system makes Bezymianny a preeminent target for discerning the mechanics of pre-eruption seismicity. Because Bezymianny is arguably the type example of a growing class of volcanoes that have experienced massive sector collapse followed by decades-long lava dome growth, the mechanics of Bezymianny may well be portable to numerous other volcanoes.
UR: http://gps.alaska.edu/PIRE/
DE: 7280 Volcano seismology (8419)
DE: 7294 Seismic instruments and networks (0935, 3025)
DE: 8425 Effusive volcanism
DE: 8428 Explosive volcanism
DE: 8494 Instruments and techniques
SC: Seismology [S]
MN: 2007 Fall Meeting