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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.

本文简要介绍了名古屋市三野温泉井的调查和地震观测结果、野壁平原的微震台阵观测和地震模拟分析。三无井的调查和地震观测证实，三无井下有一基岩，由坚硬的花岗岩组成，V_s=2.8公里/S，埋深约670m，并由沿井的PS测井获得了S波速分布。我们在基岩和地表观测到了许多地震记录，包括诺比平原下发生的微震。利用微震阵法进行深部结构探测首先，将微震阵法估算的S波速与沿三无井的PS测井结果进行对比，验证了微震阵法的有效性。然后，对诺比平原上总共12个地点进行了调查。从而明确了名古屋市西部地区虽然东部基岩埋深约为500~600m，但存在基岩突然侵入的现象。地震运动模拟和地面结构模型检验在诺比平原的NE-西南和NW-SE方向上建立了几个横断面模型。用二维有限元方法进行的模拟分析很好地再现了观测波，而基于有限差分方法的三维分析则很好地表达了由面波组成的后相。