About HIRAKAWA KAZUOMI
About 歴史地震(Web)
About tsunami deposit
About Holocene Epoch
About Hokkaido
About Sado Island
About major tsunami
About Sea of Japan
About peninsula
About Aomori prefecture
About Akita prefecture
About Yamagata prefecture
About tsunami
About ancient tsunami
About Okushirito Island
About Oga Peninsula
About historical tsunami
About Sedimentary environments,facies
About 日本海東縁
About 津波堆積物
About 巨大津波
About 履歴