Abstract

Simultaneous separation of source, propagation path, and local site effects from observed strong motion records is carried out by an inversion method in the frequency range from 1 to 10 Hz for the purpose of empirical evaluation of the local site effects in different geological conditions. The analyzed data are S-wave portions of 167 accelerograms from 20 events observed at 7 stations along the Pacific coast of southern Tohoku and Kanto districts, Japan. These events are shallow earthquakes with magnitude from 4.0 to 6.7 and with hypocentral distance from 43 to 243 km.

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