ESTIMATION OF GROUND MOTION AT FURUKAWA GAS DURING 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

Abstract

 During 2011 off the Pacific coast of Tohoku Earthquake, strong ground motion caused serious damage to residences at Furukawa area in Miyagi Prefecture, north eastern part of Japan. Furukawa Gas supplies city gas in the damaged area, whereas no major damages were reported. Furukawa Gas manages a seismometer to monitor seismic intensity (SI), and the seismometor recorded the ground motion. However, only the later ground motion is available, and the main parts were missed. In this study, we estimate the main parts of the ground motion from the surrounding other ground motion records, aftershock records, and observed SI and PGA values by applying a time-frequency analysis.