THE PLATE SUBDUCTION UNDER KAMCHATKA: «SEISMIC » SPEED, SLOW EVENTS, DEFORMATION VELOCITY
Some results concerning subduction process of the Pacific plate under Kamchatka and related phenomena are presented. Estimates of seismic component of the velocity V of the subducting plate by CMT mechanisms and series of great earthquake in Kamchatka are obtained. The interface boundary between sub...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.582.1440 http://kiska.giseis.alaska.edu/kasp/kasp04/abstracts/gordeev.pdf |
| Summary: | Some results concerning subduction process of the Pacific plate under Kamchatka and related phenomena are presented. Estimates of seismic component of the velocity V of the subducting plate by CMT mechanisms and series of great earthquake in Kamchatka are obtained. The interface boundary between subducting plate and Kamchatka (the continental plate) at depths 30-70 km is supposed to be a rectangle with strike 37°+180 ° and dip angle DIP. The rectangle location and DIP value are determined from analysis of CMT of earthquakes (1976-2003 yy) with Mw>5.5. The rectangle location is determined by CMT hypocenters cloud (DIP=25°). It turns out that the planes of CMT dipping under Kamchatka have the same dip angle 25°. For the velocity V value we have estimates: in south zone (south of c. Shipunsky): V=0.9 cm/y; in central zone (from c. Shipunsky to c. Kronotsky): V=1.4 cm/y. We have information about great Kamchatka earthquakes since 1737 year. In south zone there are 3 earthquakes with Mw>8.5 (moment magnitude estimates by (Gusev, Shumilina, 2004)). In central zone there are 2 earthquakes. |
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