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| | Abstract | | To clarify the vibration characteristics in Oshu City of Iwate Prefecture, where many houses were damaged by both the 2011 off the Pacific coast of Tohoku Earthquake and the aftershock occurred at April 7, 2011, the survey of seismic intensity was done using questionnaires for both the main shock and the aftershock. 7,284 questionnaires were distributed for parents of students of 31 elementary schools for both earthquakes. The seismic intensities for the main shock were ranging from 7.3 to 2.8, and the average was 5.5. The seismic intensities for the aftershock were ranging from 7.2 to 2.2, and the average was 4.8. The seismic intensities calculated from questionnaires were averaged for 1km or 250m square meshes in whole Oshu City. As a result, it was revealed that the seismic intensities in Maesawa Distruct and Esashi District of Oshu City ware large. The seismic intensities for the main shock had a good correlation with those for the aftershock. In whole Oshu city, however, the seismic intensities for the main shock did not have a good correlation with site amplifications. |
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