Study on basement of earthquake input motion under the Nobi plain based on earthquake observation

基于地震观测的浓尾平原地震输入运动基底研究

基本信息

批准号：
11555123
负责人：
SAWADA Yoshihiro
金额：
$ 8.77万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555123/
关键词：
hot spring borehole base rock PS logging microtremor array survey earthquake observation Nobi plain 地震入力基盤微動

项目摘要

This report briefly describes about the results of survey and earthquake observation at the San-no hot spring borehole in Nagoya city, the microtremor array survey and the earthquake simulation analysis in the Nobi plain.1. Survey and earthquake observation at the San-no boreholeIt was confirmed that a base rock, consisting of hard granite ; Vs=2.8km/s, under the San-no site lied at a depth of about 670m and S wave velocity distribution was also obtained from the PS logging along the borehole. We observed many earthquake records at the base rock and surface ground, including the micro earthquakes happened under the Nobi plain.2. Survey of deep structure using the microtremor array methodAt first, the microtremor array method was verified by comparing the S wave velocities estimated from this method with those obtained by PS logging along the San-no borehole. Then, twelve sites in all were surveyed on the Nobi plain. Consequently, it was clarified that the abrupt incrimination of base rock exists beneath the western area of Nagoya city, though the base rock at eastern part is about from 500m to 600m in depth.3. Simulation of earthquake motion and examination of ground structure modelSeveral cross section models ware made up in NE-SW and NW-SE directions across the Nobi plain. The simulation analysis by using 2-D finite element method well reproduces the observational waves, and 3-D analysis based on finite difference method shows a good expression for an after phase consisted of surface waves.

该报告简要介绍了名古屋市的San-No温泉钻孔的调查和地震观察结果，Microfemor阵列调查以及Nobi Plain中的地震仿真分析1。 San-No Boreholeit的调查和地震观察被证实，一块由硬花岗岩组成的基本岩石。 VS = 2.8 km/s，在San-No位置下，深度约为670m，S波速度分布也是从沿钻孔的PS记录中获得的。我们观察到基本岩石和地面地面的许多地震记录，包括微地震发生在Nobi平原下2。首先，使用微生物阵列方法对深层结构进行调查，通过将从该方法估计的S波速度与PS沿San-No钻孔进行的PS记录获得的S波速度进行了比较，从而验证了微生物阵列方法。然后，在Nobi平原上对所有十二个地点进行了调查。因此，澄清说，基本岩石的突然犯罪存在于名古屋城的西部地区，尽管东部的基本岩石的深度约为500m至600m。地震运动的模拟和地面结构模型横截面模型的仿真，以NOBI平原的NE-SW和NW-SE方向组成。通过使用2-D有限元方法进行的仿真分析很好地再现了观测波，基于有限差异方法的3-D分析显示出一个由表面波组成的后相的良好表达。