History
The epicenter of the 1933 Sanriku earthquake was located offshore, 290 kilometres (180 mi) east of the city of Kamaishi, Iwate. The initial shock occurred on at 0230 AM on March 2, 1933. The earthquake measured 8.4 on the moment magnitude scale and was in approximately the same location as the 1896 Meiji-Sanriku earthquake. The epicenter occurred far enough away from the town that the earthquake itself did little damage to buildings. Approximately three hours after the main shock was a magnitude 6.8 aftershock, followed by 76 more aftershocks (with a magnitude of 5.0 or greater) over a period of six months.
This earthquake was an intraplate earthquake in the Pacific Plate. The focal mechanism of this earthquake showed that it was a normal faulting earthquake.
Read more about this topic: 1933 Sanriku Earthquake
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