Abstract
Detailed seismic intensity distribution was re-evaluated from the data of damage wooden houses during the 1923 Kanto earthquake in Tokyo Metropolis. The seismic intensities of most blocks were less than 5+ in JMA scale on the Yamanote terrace. They were 6+ or 7 in the east side of Sumida River in the Shitamachi lowland, while they were less than 6- in the west side even in the Shitamachi lowland because there is a buried diluvial terrace under this region. The other areas where seismic intensity was 6+ or 7 were located along the line of Kanda-Zinbo-cho, Otemachi, and Hobiya. According to the old map before more than 500 years, this line was corresponding to the old creak of Kanda River and the Hibiya inlet, where a valley was buried under the ground and alluvial soil was accumulated very thick.
