Three-dimensional shear velocity structure beneath the Japan islands and its tectonic implications.
Three-dimensional shear velocity structure beneath the Japan islands and its tectonic implications.
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日本列岛下方三维剪切速度结构及其构造意义.
DOI：
10.4294/jpe1952.28.221
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
K. Hirahara
中科院分区：
文献类型：
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作者：
K. Hirahara
通过应用 Aki 等人开发的反演技术，研究了日本列岛和日本海下方的三维剪切速度结构。将所获得的结构与先前获得的三维压缩速度结构进行了比较，讨论了下行太平洋板块及其周围上地幔的内部物理性质和构造。结果表明，高剪切速度（VS）异常通常与高压缩速度（VP）异常重合，其中存在中震源和深源地震的高地震活动。与之前的 P 波结果一样，S 波观测很好地揭示了下降至 450 公里的太平洋板块和日本海下延伸至日本西南部的内部低 V 区。板块内最高的VS异常为6-8%（50-250km）、5%（350km）和2-3%（450km），略大于相应的VP异常。内部低VS异常为-2--4%，也比VP异常强一些。板与内部低 V 区之间 VS 和 VP 的速度对比需要较大的温差和
A three-dimensional shear velocity structure beneath the Japan Islands and the Sea of Japan have been investigated by applying an inversion technique developed by Aki and others. The obtained structure has been compared with the three-dimensional compressional velocity structure obtained earlier to discuss the internal physical properties and tectonics of the downgoing Pacific plate and the surrounding upper mantle. The results show that high shear velocity (VS) anomalies generally coincide well with high compressional velocity (VP) anomalies, where there are high seismic activities of intermediate and deep-focus earthquakes. The descending Pacific plate down to 450km and the inner low-V zone extending under the Sea of Japan to southwest Japan have been well revealed by the S-wave observations as in the previous results from P-waves. The highest VS anomalies within the plate are 6-8% (50-250km), 5% (350km) and 2-3% (450km), which are somewhat greater than the corresponding VP anomalies. The inner low VS anomalies are -2--4%, which also somewhat stronger than the VP anomalies. The velocity contrasts of both VS and VP between the plate and the inner low-V zone require large temperature differences and
影响因子：
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作者：
K. Aki;A. Christoffersson;E. Husebye
通讯作者：
K. Aki;A. Christoffersson;E. Husebye