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首页> 外文期刊>Journal of Asian earth sciences >Subduction of transitional crust at the Manila Trench and its geophysical implications
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Subduction of transitional crust at the Manila Trench and its geophysical implications

机译：马尼拉海沟过渡壳的俯冲及其地球物理意义

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摘要

The subducting South China Sea crust at the northern Manila Trench has been categorized as the transitional crust, which is a rifted, thinned continental crust. We tested the consequence of the subduction of transitional crust with a numerical dynamic model. Our numerical model indicates that, with subducting transitional crust, normal fault earthquakes underneath the accretionary prism would occur deeper and probably with larger magnitude. Normal fault earthquakes near the trench outer rise are usually shallower than 30 km depth around the world. A notable exception is at the northern Manila Trench where normal fault earthquakes around 40 km depth are common, which can be explained by our model. Our result indicates that the stress on the northern segment of the Manila Trench is relaxed, which is less likely to generate great megathrust earthquakes.
机译：马尼拉海沟北部俯冲的南海地壳被归类为过渡壳，这是一个裂谷，变薄的大陆壳。我们用数值动力学模型测试了过渡壳俯冲的结果。我们的数值模型表明，在俯冲过渡地壳的作用下，增生棱镜下方的正断层地震会发生得更深，幅度可能更大。靠近沟槽外部上升段的正常断层地震通常在世界范围内深度小于30 km。一个明显的例外是在马尼拉海沟北部，那里40 km深的正常断层地震很普遍，这可以用我们的模型来解释。我们的结果表明，马尼拉海沟北部的应力得到缓解，这不太可能产生巨大的特大推力地震。

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