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Comparative Study of Remotely Triggered Seismicity at the Katmai Volcanoes, Alaska: Jacqueline Caplan-Auerbach

Project Title: Comparative Study of Remotely Triggered Seismicity at the Katmai Volcanoes, Alaska
Mendenhall Fellow: Jacqueline Caplan-Auerbach, (907) 786-7460, jca@usgs.gov
Duty Station:Anchorage, Alaska
Start Date: January 12, 2004
Education: Ph.D., U. of Hawai`i at Manoa, 2001
Research Advisors: John Power (907) 784-7426, jpower@usgs.gov; Seth Moran (360) 993-8934, smoran@usgs.gov

Project Description: Recent large earthquakes such as the 2002 M7.9 Denali earthquake and the 1997 M7.1 Hector Mine event have confirmed that regional and teleseismic earthquakes can trigger local seismicity in active volcanic or geothermal regions. In Alaska, the Katmai volcanic group appears to be particularly susceptible to triggering, with triggered activity occurring following the Denali event as well as two M>6.5 earthquakes occurring near Kodiak Island in 1999. Intriguingly, other earthquakes of comparable magnitude and distance to Katmai did not instigate local seismicity at the volcanoes. The Kodiak Island earthquakes are unusual in that they were deeper (hypocentral depths of 40-50 km) than many other earthquakes known to have triggered seismicity. This project seeks to investigate the causes of triggered seismicity in the Katmai region with emphasis on the effects of earthquake depth, rupture mechanism and slip history. Why Katmai exhibits triggering while other highly seismically active volcanoes in Alaska, many of which were nearer the triggering earthquakes, do not will be evaluated.

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