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Statistical Studies of Induced and Triggered Seismicity at The Geysers, California

出版	University of California, Davis, 2015
ISBN	13392604929781339260495
URL	http://books.google.com.hk/books?id=3qjVjwEACAAJ&hl=&source=gbs_api

註釋This study considers the statistics of induced and triggered seismicity at The Geysers geothermal field, California. Little seismicity was reported before steam extraction began in 1960. In 1980 the residual water associated with power generation was re-injected, producing induced seismicity. Beginning in 1997 large-scale injections of cold water began in order to enhance the generation of steam. This led to an increase in M 1.2 earthquakes from approximately five per month to twenty. The induced seismicity satisfies Gutenberg- Richter (GR) scaling to a good approximation with b [approximately equal to] 1.3. This study demonstrates that aftershocks of the larger induced earthquakes also satisfy GR scaling as well as Omori's law for their time dependence. Statistics of triggered seismicity at The Geysers are also presented. The 8/24/14 M[subscript]w = 6.02 South Napa earthquake triggered a M [approximately equal to] 4.38 event as well as some 80 other M 1.25 events. The GR and decay statistics will be given. However, in order to separate second-order aftershocks from triggered aftershocks, an additional triggered sequence is studied. The M = 7.2 4/4/10 Baja earthquake had some 34 M>1.25 triggered events in the first hour including a M = 3.37 event.