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1797 Riobamba earthquake : ウィキペディア英語版
1797 Riobamba earthquake

The 1797 Riobamba earthquake occurred at 12:30 UTC on 4 February. It devastated the city of Riobamba and many other cities in the Interandean valley, causing up to 40,000 casualties. It is estimated that seismic intensities in the epicentral area reached at least XI (''Extreme'') on the Mercalli intensity scale, and that the earthquake had a magnitude of 8.3,〔(【引用サイトリンク】title=Comments for the Significant Earthquake )〕 the most powerful historical event known in Ecuador. The earthquake was studied by Alexander von Humboldt, when he visited the area in 1801/2.
==Tectonic setting==
The active tectonics of Ecuador is dominated by the effects of the subduction of the Nazca Plate beneath the South American Plate. The main NNE-SSW trending fault systems show a mixture of dextral (right lateral) strike-slip faulting and reverse faulting. In addition to these faults that run parallel to the Andes in Ecuador, there are two important SW-NE trending-dextral-fault systems: the Pallatanga fault and the Chingual fault. The Pallatanga fault runs close to the epicenter and movement on this fault has been suggested as the cause of the earthquake, although there is no clear surface break supporting such recent movement.

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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