Comprehensive study of the seismotectonics of the Aleutian Arc. Annual progress report, March 1, 1973--February 28, 1974
Description: Basic research is carried out to derive a coherent theory for the tectonic structure and geological history of the Alaska-Aleutian island arc in the framework of recent advancements of plate tectonics. An important part of this study is the evaluation of the seismic risk particularly in the eastern Aleutian arc which forms a major section of the active boundary between the North American and Pacific plates. The main effort during the current research term was concentrated on installation of a sufficiently dense and modern seismic station network. Two independent, telemetered networks were installed. One covers the Shumagin Islands region, a section of the eastern Aleutian Arc which was identified from earlier research as a region of susaected high risk for a possible major earthquakes in the not too distant future. Another less concentrated and rather elongated network was installed jointly with the University of Alaska along a roughly 1000 km long section of the eastern Aleutian arc east of longitude 168 deg W including the Alaskan Peninsula. It monitors the regional seismic background activity. Seismic data from these two networks provide the basis for testing physical models which were recently developed in an effort to advance systematic methods for earthquake prediction. (auth)
Date: January 1, 1974
Creator: Jacob, K.H.
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