Questionnaire Investigation of Ground Motion Characteristics of main shock and aftershock of the 2011 Great East Japan Earthquake

概要

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Currently used Japanese seismic intensity based on measurement value by mechanical instrumentation, which is called measurement seismic intensity and not always affects human body feeling and earthquake damage. The measurement seismic intensity represents local ground motion characteristics at an observation point due to the foundation and geology conditions and is difficult to evaluate the seismic intensity at a point between observation points. The questionnaire seismic intensity can be said to be very effective in the point. Therefore, in this research, the questionnaire survey to investigate areal ground motion characteristics in two cities in Miyagi prefecture during the 2011 off the Pacific coast of Tohoku Earthquake and its one of aftershocks on April 7, 2011. One is Ohsaki city of which central area was suffered from serious damage in the main shock. The other is Kurihara city including the Tsukidate area where serious damage in the main shock. The other is Kurihara city including the Tsukidate area where serious damage was not recognized even if the seismic intensity scale was 7 during the main shock.