首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >A bump on the upper surface of the Philippine Sea plate beneath the Boso Peninsula, Japan inferred from seismic reflection surveys: A possible asperity of the 1703 Genroku earthquake
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A bump on the upper surface of the Philippine Sea plate beneath the Boso Peninsula, Japan inferred from seismic reflection surveys: A possible asperity of the 1703 Genroku earthquake

机译:根据地震反射调查推断,日本Boso半岛下方菲律宾海板上表面的一个凸起:1703年根禄地震的可能粗糙

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摘要

To reveal a subsurface structure beneath the southern part of the Boso Peninsula, Japan, where the Philippine Sea plate is subducting and great interplate earthquakes associated with the subduction occur repeatedly, we conducted a new seismic reflection survey from March to April 2005 (Boso05). We also reanalyzed old multi_channel seismic (MCS) survey data that had been collected off the Boso Peninsula in 1978 (SK78). We found clear strong reflectors beneath the southern coast of the Boso Peninsula. Since common mid points (CMPs) were distributed widely beneath the study area owing to the design of the receiver and shot lines of Boso05, we selected appropriate directions of stacking lines to get the best image of the dipping reflectors by optimum azimuth search (OAS) processing. We carefully checked the seismic profiles at the intersections of the survey lines to confirm the NNE-dipping configuration of the strong reflectors. These strong reflectors were interpreted as the upper surface of the subducting PHS plate from their locations and the estimated velocities beneath the reflectors. Furthermore, these reflectors revealed a topographic high (bump) beneath the southern coast of the Boso Peninsula where the source fault of the Genroku earthquake of 1703 is thought to be located.
机译:为了揭示日本Boso半岛南部下方的地下结构,菲律宾海板块正在俯冲,并且与俯冲相关的板块间地震反复发生,我们于2005年3月至4月进行了新的地震反射调查(Boso05)。我们还重新分析了1978年从Boso半岛(SK78)采集的旧的多通道地震(MCS)勘测数据。我们在Boso半岛南部海岸下方发现了清晰的强反射层。由于Boso05的接收器和发射线的设计,共同的中点(CMP)广泛分布在研究区域下方,因此我们选择了适当的堆叠线方向,以通过最佳方位角搜索(OAS)获得浸入式反射器的最佳图像。处理。我们仔细检查了测量线相交处的地震剖面,以确认强反射器的NNE浸入配置。这些强反射器从其位置和反射器下方的估计速度解释为俯冲PHS板的上表面。此外,这些反射器还发现了Boso半岛南部海岸下方的地形高点(凸点),据信该地是1703年根禄库地震的震源所在。

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