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1498 Nankai earthquake
The 1498 Nankai earthquake (明応地震 Meiō Jishin) occurred off the coast of Nankaidō, Japan, at about 08:00 local time〔(【引用サイトリンク】title=IISEE search page )〕 on 20 September 1498.〔 It had a magnitude estimated at 8.6 MS〔 and triggered a large tsunami. The death toll associated with this event is uncertain, but between 26,000 and 31,000 casualties were reported.〔(【引用サイトリンク】title=Comments for the Tsunami Event )〕 A tsunami caused by the Meiō Nankaidō earthquake washed away the building housing the statue of the Great Buddha at Kōtoku-in in Kamakura.
==Tectonic setting==
The southern coast of Honshū runs parallel to the Nankai Trough, which marks the subduction of the Philippine Sea Plate beneath the Eurasian Plate. Movement on this convergent plate boundary leads to many earthquakes, some of them of megathrust type. The Nankai megathrust has five distinct segments (A-E) that can rupture independently, the segments have ruptured either singly or together repeatedly over the last 1,300 years. Megathrust earthquakes on this structure tend to occur in pairs, with a relatively short time gap between them. In addition to the two events in 1854, there were similar earthquakes in 1944 and 1946. In each case, the northeastern segment ruptured before the southwestern segment. In the 1498 event, the earthquake is thought to have ruptured segments C, D and E and possibly A and B. If both parts of the megathrust ruptured, the events were either simultaneous, or close enough in time, to not be distinguished by historical sources.〔
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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