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1730 Valparaíso earthquake : ウィキペディア英語版 | 1730 Valparaíso earthquake
The 1730 Valparaíso earthquake occurred at 03:45 local time (08:45 UTC) on July 8. It had an estimated magnitude of 8.7 and triggered a major tsunami with an estimated magnitude of Mt=8.75, that inundated the lower parts of Valparaíso. The earthquake caused severe damage from La Serena to Chillan, while the tsunami affected more than of Chile's coastline.〔(【引用サイトリンク】title=NGDC page for this event )〕 ==Tectonic setting== The earthquake took place along the boundary between the Nazca and South American tectonic plates, at a location where they converge at a rate of seventy millimeters a year. Chile has been at a convergent plate boundary that generates megathrust earthquakes since the Paleozoic (500 million years ago). In historical times the Chilean coast has suffered many megathrust earthquakes along this plate boundary, including the strongest earthquake ever measured. Most recently, the boundary ruptured in 2010 in central Chile.
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