Survey of the Subsurface Structure in the East of the Osaka Basin
Survey of the Subsurface Structure in the East of the Osaka Basin
复制标题
大阪盆地东部地下构造调查
DOI：
10.4294/zisin1948.49.2_193
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
T. Ikawa
中科院分区：
文献类型：
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作者：
M. Horike;Y. Takeuchi;S. Imai;Takashi Fuzita;H. Yokota;Toshikazu Noda;T. Ikawa
为了预测地震运动，对大阪盆地东部的地下地质构造进行了调查。反射测量揭示了埋藏在1.5-1.7公里深的基岩以下的详细的P-速度结构。大阪盆地反射剖面普遍存在的特征也在反射剖面上得到证实：沉积物被分为由海相和陆相沉积交替堆叠而成的浅层和仅由陆相沉积组成的深层。利用地脉动相速度的反演，对地脉动的阵列分析还揭示了向下到基岩的S速度结构。在此基础上，结合目前和以往的地质资料，提出了大阪盆地东西向二维地下构造模型。
A survey of the geological subsurface structure was conducted in the east of the Osaka basin in order to predict seismic motions. The reflection survey revealed a detailed P-velocity structure down to the basement rock embedded at a depth of 1.5 km to 1.7 km. The features appearing commonly in reflection profiles of the Osaka basin are comfirmed in the reflection profiles as well: the sediments are divided into a shallow layer composed of alternate stacks of marine and non-marine deposits and a deep layer composed of only non-marine deposits. The array analyses of microtremors also revealed S-velocity structures down to the basement rock, using the inversion of microtremor phase velocities. Furthermore, a two-dimensional east-west subsurface structure model of the Osaka basin is proposed, combining geological information obtained by present and past surveys.