Evidence for a thick mantle transition zone beneath the Philippine Sea from multiple‐ScS waves recorded by JISNET
Evidence for a thick mantle transition zone beneath the Philippine Sea from multiple‐ScS waves recorded by JISNET
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JISNET 记录的多次 ScS 波证明菲律宾海下方存在厚地幔过渡带
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Ibnu Purwana
中科院分区：
文献类型：
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作者：
T. Ohtaki;D. Suetsugu;K. Kanjo;Ibnu Purwana
我们在印度尼西亚西部和中部部署了 JISNET 宽带地震台网。利用 JISNET 和其他宽带站的数据，我们利用 ScS 混响法估算了东亚、东南亚和菲律宾海下方地幔过渡带的厚度。其厚度在东亚和东南亚以下约240公里，菲律宾海西缘以下280-290公里，菲律宾海中部以下260-280公里，伊豆-小笠宁岛弧以下260公里。这些结果意味着，菲律宾海西缘以下的温度比全球平均温度低约300 K，菲律宾海中部以下的温度低200 K，伊豆-小笠宁岛弧以下的温度低130 K，几乎等于东亚和东南亚的平均温度。
We deployed the JISNET broadband seismic network in west and central Indonesia. Using data from JISNET and other broadband stations, we estimate the thickness of the mantle transition zone beneath East and Southeast Asia and the Philippine Sea using the ScS reverberation method. The thickness is about 240 km beneath East and Southeast Asia, 280–290 km beneath the western edge of the Philippine Sea, 260–280 km beneath the central part of the Philippine Sea, and 260 km beneath the Izu‐Bonin Arc. These results imply that the temperature is about 300 K lower than the global average beneath the western edge of Philippine Sea, 200 K lower beneath the mid part of the Philippine Sea, 130 K lower beneath the Izu‐Bonin arc, and almost equal to the average beneath East and Southeast Asia.