Nonvolcanic Deep Tremor Associated with Subduction in Southwest Japan

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Science  31 May 2002:
Vol. 296, Issue 5573, pp. 1679-1681
DOI: 10.1126/science.1070378

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Deep long-period tremors were recognized and located in a nonvolcanic region in southwest Japan. Epicenters of the tremors were distributed along the strike of the subducting Philippine Sea plate over a length of 600 kilometers. The depth of the tremors averaged about 30 kilometers, near the Mohorovic discontinuity. Each tremor lasted for at most a few weeks. The location of the tremors within the subduction zone indicates that the tremors may have been caused by fluid generated by dehydration processes from the slab.

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