Phase velocities of Rayleigh waves in the MELT experiment on the East Pacific Rise
Phase velocities of Rayleigh waves in the MELT experiment on the East Pacific Rise
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DOI：
10.1126/science.280.5367.1235
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发表时间：
1998-05-22
期刊：
影响因子：
56.9
通讯作者：
Shen, Y
中科院分区：
文献类型：
--
作者：
Forsyth, DW;Webb, SC;Shen, Y
瑞利波的相速度增加更迅速地从东太平洋隆起（EPR）轴的距离比岩石圈的传导冷却模型预测。轴附近的低速可能是由几百公里宽的区域内20至70公里深处的部分熔融造成的。波的传播是各向异性的;快波方向近似垂直于脊，平行于扩展方向。各向异性从轴附近的最小值增加到侧面的3%或更多。
The phase velocities of Rayleigh waves increase more rapidly with distance from the East Pacific Rise (EPR) axis than is predicted by models of conductive cooling of the lithosphere. Low velocities near the axis are probably caused by partial melt at depths of 20 to 70 kilometers in a zone several hundred kilometers wide. The lowest velocities are offset to the west of the EPR, Wave propagation is anisotropic; the fast direction is approximately perpendicular to the ridge, parallel to the spreading direction. Anisotropy increases from a minimum near the axis to 3 percent or more on the flanks.