P Wave Velocity Distribution in the Down Going Slab

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  • TADA Takashi
    Department of Earthsciences, Faculty of Science, Nagoya University

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  • 深発地震帯中のP波速度分布
  • シンパツ ジシンタイ チュウ ノ Pハ ソクド ブンプ

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P wave velocity distribution in the down going slab near the Japanese islands arc was studied by the travel time curves derived from the deep focus earthquakes.<br>The P wave velocity in the down going slab is higher than the surrounding normal mantle: about 5, 3.5, and 2.5% at the depth of 200, 400, and 600km respectively. The velocity anomaly of 5% corresponds to the temperature anomaly of about 1000° at the depth of 200km. This value agrees well with the theoretical temperature anomaly in the down going slab by many other authors.<br>The low velocity layer in the down going slab may not be existent, but the low velocity layer in the surrounding normal mantle near the Japanese islands arc may begin beneath the Moho discontinuity and the depth of the minimum velocity is about 100km.<br>The existence of the olivine-spinel phase transitional layer in the down going slab is not still clear.

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