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首页> 外文期刊>Pure and Applied Geophysics >Interplate Coupling in the Kanto District, Central Japan, and the Boso Peninsula Silent Earthquake in May 1996
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Interplate Coupling in the Kanto District, Central Japan, and the Boso Peninsula Silent Earthquake in May 1996

机译：1996年5月，日本中部关东地区的板间耦合和Boso半岛无声地震

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— I studied crustal deformation in the Kanto district, central Japan, based on continuous GPS data. Horizontal as well as vertical displacement rate demonstrate significant interaction between the landward Kanto block and the Philippine Sea plate. Although the subduction effect of the Pacific plate is not apparent, it is reasonable to consider the entire Kanto district is displaced westward due to the interaction with the Pacific plate. The GPS velocity data were inverted to estimate the slip deficit distribution on the Sagami Trough subduction zone. The result delineates a strongly coupled region on the plate interface, part of which corresponds to the 1923 Kanto earthquake. The strongly coupled region is located shallower than 20 km. In addition, the plate interaction is laterally heterogeneous even in the same depth range, implying thermal structure is not the only factor controlling interplate coupling. The GPS data also detected a silent earthquake event on the interface of the Philippine Sea slab east of the Boso Peninsula in the middle of May, 1996. The silent rupture propagated over a 50 km * 50 km wide area during about a week. The maximum slip was approximately 50 mm and the released seismic moment was 4.7*1018Nm (M w 6.4). There was a small seismicity triggered by this silent event. The silent slip was located in the peripheral of the strongly coupled area, suggesting that frictional properties and/or stress conditions are inhomogeneous on the plate boundary interface.
机译：—我根据连续的GPS数据研究了日本中部关东地区的地壳变形。水平位移和垂直位移率都表明陆上的关东地块与菲律宾海板块之间存在显着的相互作用。尽管太平洋板块的俯冲作用不明显，但考虑到与太平洋板块的相互作用，可以认为整个关东地区都向西移动。将GPS速度数据反转，以估算相模谷俯冲带上的滑差分布。结果描绘出板块界面上的强耦合区域，该区域的一部分对应于1923年关东地震。强耦合区位于20公里以下。此外，即使在相同的深度范围内，板的相互作用在横向上也是不均匀的，这意味着热结构不是控制板间耦合的唯一因素。 GPS数据还于1996年5月中旬在Boso半岛以东的菲律宾海平板界面上检测到无声地震事件。无声破裂在大约一周的时间内传播了50 km * 50 km宽的区域。最大滑移约为50 mm，释放的地震矩为4.7 * 1018 Nm（M w 6.4）。此无声事件触发了小地震。无声滑动位于强耦合区域的外围，表明摩擦特性和/或应力条件在板边界界面上是不均匀的。

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