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Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough

机译：冲绳西南海槽地震频率幅度分布的空间变化

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摘要

The relations between the frequency of occurrence and the magnitude of earthquakes are established in the southern Okinawa Trough for 2823 relocated earthquakes recorded during a passive ocean bottom seismometer experiment. Three high b -values areas are identified: (1) for an area offshore of the Ilan Plain, south of the andesitic Kueishantao Island from a depth of 50 km to the surface, thereby confirming the subduction component of the island andesites; (2) for a body lying along the 123.3°E meridian at depths ranging from 0 to 50 km that may reflect the high temperature inflow rising up from a slab tear; (3) for a third cylindrical body about 15 km in diameter beneath the Cross Backarc Volcanic Trail, at depths ranging from 0 to 15 km. This anomaly might be related to the presence of a magma chamber at the base of the crust already evidenced by tomographic and geochemical results. The high b -values are generally linked to magmatic and geothermal activities, although most of the seismicity is linked to normal faulting processes in the southern Okinawa Trough.
机译：在被动海底地震仪实验中记录的2823处重新定位的地震中，在冲绳海槽南部建立了发生频率与地震幅度之间的关系。识别出三个高b值区域：（1）在安第斯山脉的奎伊山涛岛以南，距地表50 km深度处的宜兰平原近海区域，从而确定了该岛安山岩的俯冲成分; （2）沿123.3°E经线位于0至50 km深度的物体可能反映出由于板状裂缝而上升的高温流入; （3）对于第三个圆柱体，其直径在Back Backcc火山小径下方约15公里，深度为0至15公里。这种异常可能与地层底部存在岩浆腔有关，这已经由层析成像和地球化学结果证明了。高b值通常与岩浆和地热活动有关，尽管大多数地震活动与冲绳海槽南部的正常断层过程有关。

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