论文部分内容阅读
用联合反演三维速度结构与震源参数的方法确定日本西南部九州背弧层析图象。成像中使用的是从日本西部到中国东部广大区域内305个地震台记录的2736个地方震的初至到时资料。同时补充使用了357个远震的到时。在北纬30°～34°和东经128°～132°范围至少深达150km 范围内,我们得到了高分辨率的地幔顶层的 P 波层析图象。反演结果揭示出九州岛以西近海40～100km 深度范围内有一个大的强低速带。这种特征可能是由延展的冲绳海槽东北缘地区热地幔上涌产生的部分熔融引起的。
Determination of Kyushu back arc tomographic image in southwestern Japan using joint inversion of 3D velocity structure and source parameters. The first arrival data of 2736 local earthquakes recorded by 305 seismostation stations from the west of Japan to the vast area of eastern China were used for the imaging. At the same time replenishment of the use of the arrival of 357 telekinesis. At a depth of at least 150 km from latitude 30 ° to 34 ° N and longitude 128 ° to 132 ° E, we obtain a high-resolution P-wave tomographic image of the top of the mantle. The inversion results reveal that there is a large strong low-speed zone in the depth of 40 ~ 100 km near the west of Kyushu Island. This feature may be caused by partial melting of the extended upwelling of the hot mantle in the northeastern margin of the extended Okinawa Trough.