Soil subsidence map for the coastal areas of Kawasaki City Liquefied in the 2011 off the Pacific coast of Tohoku Earthquake

Abstract

On March 11th, 2011, a gigantic earthquake of moment magnitude Mw 9.0, which is officially named “The 2011 Off the Pacific Coast of Tohoku Earthquake”, caused severe liquefaction damage over the long stretch of reclaimed lands along the coast of the Tokyo Bay. In response to this earthquake, liquefaction-induced soil subsidence map for the eastern part of Tokyo Bay area was immediately prepared by comparing a set of Digital Surface Models before and after the earthquake, and subtracting tectonic displacement. In this study, soil subsidence map is further extended to cover the coastal part of Kawasaki city. The spatial pattern of ground subsidence shown in subsidence map is consistent on the whole with that described in the damage investigation report.