EVALUATION OF BEDROCK MOTIONS IN TOKYO BAY AREA AND SITE AMPLIFICATION CHARACTERISTICS OF LONG PERIOD GROUND MOTIONS DURING THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

Abstract

This report describes engineering bedrock motions in Urayasu and Yumenoshima sites using the strong ground motions recorded in the downhole array observations during the 2011 off the Pacific Coast of Tohoku earthquake. Site amplification characteristics of long period ground motions are discussed in Tokyo bay area, where soft surface layers on the engineering bedrock attributed to amplification of the ground motions with period range over 1s.