Investigation of Seismic Records of the 2011 off the Pacific Coast of Tohoku Earthquake at the Base of a Dam Site Using the Empirical Green's Function Method

Abstract

Seismic waveforms of the 2011 off the Pacific Coast of Tohoku Earthquake recorded at the base of a dam site in Fukushima prefecture are analyzed comparing bore-hole motion records of KiK-net, and are reproduced based on the empirical Green's function method. Three empirical Green's functions are prepared to five strong-motion-generation-areas (SMGAs) model by the records at minor earthquakes, considering the spread of the fault area. Nearly simultaneous arrivals from SMGAs at off-shore Miyagi prefecture and off-shore Fukushima prefecture contributed to the maximum acceleration value at the target site.