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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Fault plane geometry in the source region of the 1994 Sanriku-oki earthquake
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Fault plane geometry in the source region of the 1994 Sanriku-oki earthquake

机译：1994年三陆OKI地震震源区的断层平面几何形状

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摘要

We present the results of a seismic refraction experiment conducted off eastern Aomori, northeastern Japan forearc region, where the detailed crustal structure was poorly known. An objective analysis using high-quality survey data allowed us to obtain the seismic velocity structure to about 30 km depth, and in particular, to obtain a well-constrained geometry of the plate boundary in the source region of the 1994 Sanriku-oki earthquake. Our results show that the subducting Pacific oceanic plate increases its dip from about 5° to approximately 15° around the longitude of 143.5° E, 80 km landward of the trench axis near the latitude of 40° N. The location of this bend in the plate is 40 km east of the bending point previously proposed on the basis of hypocenter distribution. A cluster of aftershocks of the 1994 Sanriku-oki earthquake occurred around the bending point. This is because the bending of the subducting plate appears to affect the stress state in the vicinity of the plate boundary. Furthermore, the plate geometry is also considered to be related to the coupling or slip features along the plate boundary as the bending point correlates with the spatial distribution of repeating earthquakes. Our results will lead to more reliable determinations of asperity areas because an accurate dip angle of the fault plane is necessary for slip distribution studies.
机译：我们介绍了在日本东北部前臂地区青森县东部进行的地震折射实验的结果，在该地区，详细的地壳结构鲜为人知。使用高质量的调查数据进行的客观分析，使我们能够获得大约30 km深度的地震速度结构，尤其是在1994年三陆木井地震震源区域中，板块边界的几何形状得到了很好的约束。我们的结果表明，俯冲的太平洋洋板围绕着东经143.5°E，在40°N纬度附近的海沟轴着陆80公里处，其倾角从大约5°增大到大约15°。板块在先前根据震源分布提出的弯曲点以东40公里处。在弯曲点附近发生了1994年三陆冲木地震的余震。这是因为俯冲板的弯曲似乎会影响板边界附近的应力状态。此外，板块的几何形状也被认为与沿板块边界的耦合特征或滑动特征有关，因为弯曲点与重复地震的空间分布有关。我们的结果将导致对凹凸区域的确定更加可靠，因为断层平面的准确倾角对于滑动分布研究是必需的。

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