Posted by: clione | October 11, 2007

Slow slip earthquakes

The term “slow slip” has come to be heard from 2000. It means underground rockslide, which tends to cause large earthquakes, advances slowly without generating tremors that people can feel.

In the plate theory, the Boso Peninsular is said to be moving in the northwestern direction by approximately two centimeters. However, the observation satellite has found that the rocks have shifted one to two centimeters in the opposite southeastern direction. According to preliminary calculations based on this theory, when a slow slip occurs at an instant, it generates energy equivalent of an earthquake with a magnitude of 6.5. Slow slips have also been observed in the western Shikoku region, the northern Kii Peninsula and Aichi Prefecture. Slow slips occur when Nius move slowly so that they would not cause damage to people, and huge earthquakes occur when they move abruptly at a time.

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