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1611 Sanriku earthquake
The occurred on December 2, 1611, with an epicenter off the Sanriku coast in Iwate Prefecture. The magnitude of the earthquake was 8.1M〔http://hnn.us/articles/139314.html〕 It triggered a devastating tsunami. A description of this event in an official diary from 1612 is probably the first recorded use of the term 'tsunami'.
==Overview==
At about 10:30 on December 2, 1611 (Keichō 16, 10th month, 28th day), there was a severe earthquake, and at about 14:00 (local time), this was followed by a devastating tsunami. According to old documents, the earth shook violently three times.
The estimated rupture area for the earthquake is similar to that calculated for the 1933 Sanriku earthquake.
With this earthquake, the area along the Pacific Ocean in what is currently called the Sanriku Coast did shake strongly, but only about 4-5 on the Shindo scale. The damage from the tsunami far exceeded that from the earthquake, so this is considered to be a tsunami earthquake. Consequently, the disaster caused by earthquake is also known as the "Keicho Sanriku tsunami earthquake". It would have been very similar to the 1605 Keichō Nankaidō earthquake, a tsunami earthquake in the Nankai Trough area.
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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