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首页> 外文期刊>Earth, planets and space: EPS >Low Vp and Vp/Vs zone beneath the northern Fossa Magna basin, central Japan, derived from a dense array observation
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Low Vp and Vp/Vs zone beneath the northern Fossa Magna basin, central Japan, derived from a dense array observation

机译：密集阵列观测资料得出的日本中部北部福萨麦格纳盆地下方的低Vp和Vp / Vs带

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摘要

The northern Fossa Magna (NFM) basin is a Miocene rift system formed in the final stage of the opening of the Japan Sea. The northern part of the Itoigawa-Shizuoka Tectonic Line (ISTL) bounds the western part of the northern Fossa Magna. In order to understand the active tectonics in these areas, it is essential to explain the seismic velocity structures, deep structures of active faults, and microseismicity near the active faults. In the autumn of 2002, we conducted a seismic array observation across the northern part of the ISTL and the NFM to obtain a structural image beneath the NFM. Arrival times of local earthquakes and explosive shots were used in a joint inversion for earthquake locations and 3-D Vp and Vp / Vs structures. P - and S -wave arrival time data were obtained from 73 events including 4 explosive shots, and 3809 P - and 2659 S -wave arrival times were used for the inversion analysis. We obtained a seismic velocity model revealing good correlations with the surface geology along the profile. In particular, we found thick low-velocity zones beneath the NFM and the Komoro basin and a high-velocity zone beneath the Central Uplift Zone. Beneath the NFM, a low-velocity zone with low-to-moderate Vp / Vs extends to a depth of approximately 10 km. The low-velocity suggests the existence of aqueous fluid-filled pores with high aspect ratios.
机译：北部的福萨麦格纳（NFM）盆地是日本海开放最后阶段形成的中新世裂谷系统。系鱼川-静冈构造线（ISTL）的北部与北部Fossa Magna的西部接壤。为了了解这些地区的活动构造，必须解释地震速度结构，活动断层的深层结构以及活动断层附近的微地震。在2002年秋天，我们在ISTL和NFM的北部进行了地震阵列观测，以获取NFM下的结构图像。在地震位置和3-D Vp和Vp / Vs结构的联合反演中，使用了局部地震和爆炸镜头的到达时间。从73次事件（包括4次爆炸）获得了P波和S波到达时间数据，并将3809 P波和2659 S波到达时间用于反演分析。我们获得了一个地震速度模型，揭示了沿剖面与表层地质的良好相关性。特别是，我们在NFM和Komoro盆地下方发现了厚厚的低速带，在中央隆升区下方发现了一个高速带。在NFM下，具有低至中等Vp / Vs的低速区延伸到大约10 km的深度。低速表明存在高纵横比的含水流体孔隙。

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