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| magnitude = 8.6–8.8 Mw〔.〕 | depth = | location = | countries affected = Peru | tsunami = Yes | aftershocks = | intensity = XI (''Extreme'') | casualties = 5,941〔 }} The 1746 Lima–Callao earthquake occurred at on 28 October with a moment magnitude of 8.6–8.8 and a maximum Mercalli intensity of XI (''Extreme''). The epicenter was located about north-northwest of the capital Lima, which was almost completely destroyed, and the subsequent tsunami devastated the port city of Callao. It was the deadliest earthquake in Peru’s history prior to the 1970 earthquake.〔(【引用サイトリンク】 title= Earthquakes of Peru )〕 ==Tectonic setting== Peru lies above the convergent boundary where the Nazca Plate is subducting beneath the South American Plate at a rate of 61 mm per year. It has been the location for many large and damaging earthquakes since historical records began, most of which triggered devastating tsunamis. The southern segment of the Peruvian part of this plate boundary is affected by the presence of the Nazca aseismic ridge, on the downgoing plate. It also marks a major change in the subduction geometry between 'flat-slab' subduction to the northwest and normally dipping subduction to the southeast. The ridge appears to act as a barrier to rupture propagation, reducing the potential earthquake magnitude. The 1746 earthquake is interpreted to be a megathrust event that ruptured the whole of the northern segment of the plate interface within this zone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1746 Lima–Callao earthquake」の詳細全文を読む スポンサード リンク
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