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Deep Structure and Seismotectonics of the Wharton Basin,Indian Ocean

机译：印度洋沃顿盆地的深部构造和地震构造

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摘要

The deep seismic sounding materials on the structure of the earth's crust and upper mantle in the Wharton Basin of the Indian Ocean are generalized and reinterpreted.The bulk of the deep seismic sounding data in the Wharton Basin were obtained during American edpeditions using two-vessel techniques.The sections of the earth's crust and upper mantle were compiled with the use of the T_0 method assuming a horizontally layered medium with constant seismic velocities in each of the layers.The time-distance curves of the first arrivals of refracted waves published by Francis and Raitt [23] were digitized and reinterpreted with the two-dimensional modeling method with account for the vertical velocity gradient in the layers of the earth's crust and upper mantle.In so doing,the changes in the bottom topography and thickness of the sediments over the deep seismic sonding profiles were also taken into account.The results of the modeling over selected profiles are presented in the form of a combined seismic cross section along a sublatitudinal transect 3250 km long;it suggests a significant variability in the deep structure of the Wharton Basin.A database on the earthquakes of the region considered was comp9iled;it contains 77 events that have occurred from 1903 up to the present.It was used to pplot histograms of distributions of magnitudes and hyp9ocenters of the earthquakes in the basin.A conclusion is made about the correlation between the seismicity and tectonics of the region.
机译：对印度洋沃顿盆地地壳和上地幔结构的深层地震测深资料进行了归纳和重新解释。沃顿盆地深层地震测深资料是在美国航次期间使用两容器技术获得的地壳和上地幔的断面是使用T_0方法编制的，假设每一层中的层状介质均具有恒定的地震波速。弗朗西斯和考虑到地壳和上地幔各层的垂直速度梯度，用二维建模方法对Raitt [23]进行了数字化和重新解释。这样，底部地形和沉积物厚度的变化还考虑了深部地震探空剖面。以梳状形式呈现所选剖面的建模结果沿3250 km长的横断面横断面的ined地震剖面;这表明沃顿盆地深层结构存在显着变化。已汇编了一个有关该地区地震的数据库;该数据库包含从1903年到1903年发生的77次地震。用它绘制了该盆地地震的震级和震源分布的直方图。得出了该地区地震活动性与构造之间的相关性结论。

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