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首页> 外文期刊>Geochemistry, geophysics, geosystems >Seafloor age dependence of Rayleigh wave phase velocities in the Indian Ocean
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Seafloor age dependence of Rayleigh wave phase velocities in the Indian Ocean

机译：印度洋瑞利波阶段速度的海底依赖性

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摘要

Variations in the phase velocity of fundamental-mode Rayleigh waves across the Indian Ocean are determined using two inversion approaches. First, variations in phase velocity as a function of seafloor age are estimated using a pure-path age-dependent inversion method. Second, a two-dimensional parameterization is used to solve for phase velocity within 1.25 degrees x 1.25 degrees grid cells. Rayleigh wave travel time delays have been measured between periods of 38 and 200 s. The number of measurements in the study area ranges between 4139 paths at a period of 200 s and 22,272 paths at a period of 40 s. At periods<100 s, the phase velocity variations are strongly controlled by seafloor age and shown to be consistent with temperature variations predicted by the half-space-cooling model for a mantle potential temperature of 1400 degrees C. The inferred thermal structure beneath the Indian Ocean is most similar to the structure of the Pacific upper mantle, where phase velocities can also be explained by a half-space-cooling model. The thermal structure is not consistent with that of the Atlantic upper mantle, which is best fit by a plate-cooling model and requires a thin plate. Removing age-dependent phase velocity from the 2-D maps of the Indian Ocean highlights anomalously high velocities at the Rodriguez Triple Junction and the Australian-Antarctic Discordance and anomalously low velocities immediately to the west of the Central Indian Ridge.
机译：在印度洋横跨印度洋的基本模式瑞利波的相位速度的变化使用两种反转方法确定。首先，使用纯路径年龄依赖的反演方法估计作为海底时代的函数的阶段速度的变化。其次，二维参数化用于在1.25度×1.25度网格单元中求解相位速度。在38和200秒的时间内测量了瑞利波行程时间延迟。研究区的测量值在40秒的时间为200秒和22,272条路径之间的4139路径之间。在<100 s期间，通过海底时代强烈控制相速度变化，并且显示与半空冷却模型预测的温度变化一致，用于搭桥势温度为1400℃。印度人下方的推断热结构海洋最类似于太平洋上部地幔的结构，其中相速度也可以通过半空间冷却模型来解释。热结构与大西洋上部地幔的热结构不一致，其最适合板冷却模型，并且需要薄板。从印度洋的2-D地图中去除年龄依赖的阶段速度，在罗德里格斯三交界处和澳大利亚 - 南极不间断和海全低速度到中央印度山脊以西的澳大利亚 - 南极不间断和异常低速度。

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