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A Study on the Effect of Deep Sedimentary Layrs below the Plain on Earthquake Motions

平原以下深层沉积层对地震作用的研究

基本信息

批准号：
08650689
负责人：
OHBA Shintaro
金额：
$ 1.15万
依托单位：
Osaka Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650689/
关键词：
Earthquake Observation Earthquake motion Sedimentary layr Predominant period Duration time 1995 Hyogoken-Nanbu Earthquake Range of longer period Sedimentary plain 振動継続時間表面波盆地状地形地震規模

项目摘要

This study mainly covered the influence of deep sedimentary layrs on earthquake motion characteristics, based on observation records taken from the 1995 Hyogoken-Nanbu Earthquake (Magnitude 7.2) and the 1997 March 16th Aichiken Toubu Earthquake with a magnitude of 5.8 in the Osaka Plain, Nara basin and nearly plains. Earthquake observation results show that earthquake motion characteristics in a sedimentary plain surrounded by mountains are greatly influenced by the scale of plain and magnitude of the earthquake motions.The analysis of these observations are summarized as follows :1)The range of longer period above 1.0 sec.is dependent upon the magnitude of earthquake motions and the thickness of the sedimentary layr. The predominant period increases with the increase in magnitude and depth of layrs.2)The range of shorter prevailing periods under 1.0 sec.is dependent upon the thickness of sedimentary layr within a depth of approx.100 meters.3)The predominant period in the Osaka Plain is longer than that in the Nara Basin, which has a thinner sedimentary layr. In the case of the Hyogoken-Nanbu Earthquake which has a magnitude of 7.2, the predominant period was 4.0 sec.in the Osaka Plan, and 2.5 sec.in the Nara Basin.4)The duration time of earthquake motion in a sedimentary plain depends on size of plain particularly the area. The duration time in the Osaka Plain is more than twice that of the Nara Basin, which has a smaller area.

本研究主要基于1995年兵库县南部地震（7.2级）和1997年3月16日爱知县东部5.8级地震在大阪平原、奈良盆地及近平原的观测记录，主要研究了深层沉积层对地震运动特征的影响。地震观测结果表明，群山环抱的沉积平原的地震运动特征受平原规模和地震震级的影响较大。对这些观测结果的分析总结如下：1）1.0秒以上较长周期的范围取决于地震震级和沉积层的厚度。随着地层大小和深度的增加，主导周期也随之增加。2）1.0秒以下的较短盛行周期的范围取决于深度约100米内沉积层的厚度。3）大阪平原的主导周期比奈良盆地的长，奈良盆地的沉积层较薄。在7.2级兵库县南部地震中，大阪计划的主震周期为4.0秒，奈良盆地的主震周期为2.5秒。4）沉积平原地震运动的持续时间取决于平原的大小，特别是面积。大阪平原的持续时间是面积较小的奈良盆地的两倍以上。