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首页> 外文期刊>Geochemistry, geophysics, geosystems >Stress drops for intermediate-depth intraslab earthquakes beneath Hokkaido, northern Japan: Differences between the subducting oceanic crust and mantle events
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Stress drops for intermediate-depth intraslab earthquakes beneath Hokkaido, northern Japan: Differences between the subducting oceanic crust and mantle events

机译：日本北部北海道下的中厚板内地震的应力下降：俯冲的洋壳和地幔事件之间的差异

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摘要

Spatial variations in the stress drop for 1726 intermediate-depth intraslab earthquakes were examined in the subducting Pacific plate beneath Hokkaido, using precisely relocated hypocenters, the corner frequencies of events, and detailed determined geometry of the upper interface of the Pacific plate. The results show that median stress drop for intraslab earthquakes generally increases with an increase in depth from approximate to 10 to 157 Mpa at depths of 70-300 km. More specifically, median stress drops for events in the oceanic crust decrease (9.9-6.8 MPa) at depths of 70-120 km and increase (6.8-17 MPa) at depths of 120-170 km, whereas median stress drop for events in the oceanic mantle decrease (21.6-14.0 MPa) at depths of 70-170 km, where the geometry of the Pacific plate is well determined. The increase in stress drop with depth in the oceanic crust at depths of 120-170 km, for which several studies have shown an increase in velocity, can be explained by an increase in the velocity and a decrease in the water content due to the phase boundary with dehydration in the oceanic crust. Stress drops for events in the oceanic mantle were larger than those for events in the oceanic crust at depths of 70-120 km. Differences in both the rigidity of the rock types and in the rupture mechanisms for events between the oceanic crust and mantle could be causes for the stress drop differences within a slab.
机译：在北海道以下俯冲的太平洋板块中，使用精确重定位的震源，事件的转折频率以及确定的太平洋板块上交界面的详细几何形状，对1726次中深度板内地震的应力下降的空间变化进行了研究。结果表明，在70-300 km深度处，板内地震的中值应力降通常随深度从大约10 MPa增加到157 Mpa而增加。更具体地说，海洋地壳事件的中值应力下降在70-120 km深度处减小（9.9-6.8 MPa），而在120-170 km处的深度中增大（6.8-17 MPa），而海洋地壳事件的中值应力下降。在70-170 km深度确定了太平洋板块的几何形状时，洋幔减少（21.6-14.0 MPa）。在120-170 km的深度中，随着深度的增加，应力下降随深度的增加而增加，这可以通过速度的增加和由于相变引起的含水量的减少来解释。边界在大洋地壳中处于脱水状态。在70-120 km的深度，大洋幔事件的应力降大于大洋壳事件的应力降。岩石类型的刚度以及大洋地壳与地幔之间事件的破裂机制的差异可能是平板内部应力降差异的原因。

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