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1771 Great Yaeyama Tsunami
The 1771 Great Yaeyama Tsunami (also called 明和の大津波, the Great Tsunami of Meiwa) was caused by the Yaeyama Great Earthquake at about 8 A.M. on April 24, 1771, south-southeast of Ishigaki Island, part of the former Ryūkyū Kingdom and now forming part of present-day Okinawa, Japan. According to records, 8,439 persons were killed on Ishigaki Island and 2,548 on Miyako Island.
==Earthquake analysis==
According to the Japanese government publication ''Rika-Nenpyō'' (理科年表) or ''Chronological Scientific Tables'',〔http://www.rikanenpyo.jp/〕 the epicenter was 40 km south-southeast of Ishigaki Island with a magnitude of 7.4. According to the Mamoru Nakamura Laboratory, University of the Ryukyus, the earthquake was due to the activity of the fault east of Ishigaki and it is estimated that the magnitude was 7.5.〔()〕 Further simulation led to the activity of faults in the Ryukyu oceanic trench and the magnitude was 8.0. Also, there is a hypothesis that claims the magnitude was 8.5.〔(阿部勝征(1999) ) 阿部勝征(1999): 遡上高を用いた津波マグニチュードMtの決定 -歴史津波への応用-, 地震, 第2輯, 第52巻, 369-377.〕〔阿部勝征 「津波地震とは何か」『月刊地球』Vol.25, No.5, p340〕 The depth was .〔http://seis.sci.u-ryukyu.ac.jp/hazard/EQ/1771yaeyama2/1771tsunami_2.html Meiwa earthquake was magnitude 8〕 This trench lies between the Philippine Sea Plate and the Eurasian Plate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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