Destructive strong motion estimation during the old inland large earthquakes based on empirical heterogeneous source model

基于经验异源模型的老内陆大地震破坏性强震估计

基本信息

批准号：
12650570
负责人：
KAMAE Katsuhiro
金额：
$ 1.47万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650570/
关键词：
Crustal earthquake Strong motion simulation Heterogeneous source model Hybrid technique Seismic intensity 7 1945 Mikawa earthquake Recipe of strong motion prediction 内陸地穀内浅発地震過去の内陸地震震度7 経験的不均質震源モデル震度分布

项目摘要

Most of the uncertainties in predicting strong ground motion is to model source heterogeneities of future earthquakes. An available method we propose for characterizing the heterogeneous slip distribution on the fault plane is based on the empirical source characterization derived from the slip models of the crustal earthquakes by Somerville et al. (1999). Areas of asperities having large slips are defined based on the slip models derived from waveform inversion of longer ground motion recordings than 1 second. Using this method, we can specify asperities with uniform slip on the fault surface whose sizes are constrained by the entire seismic moment of an earthquake. We need to investigate the effectiveness of the asperity models through the simulations of broad-band strong ground motions. In this study, the validity and applicability of the source models composed of some asperities and background (off asperities) for strong ground prediction are examined through the simulation of strong ground motions during the 1945 Mikawa earthquake and the 2000 Tottori-ken Senbu earthquake in Japan.In the simulation of the Mikawa earthquake, we have obtained that the distributions of the synthetic peak velocity and instrumental seismic intensity roughly correspond to the distribution of the seismic intensity estimated from the observed collapse ratio of wooden houses. Furthermore, the peak velocity of the corresponding synthetic waveform is close to 150 cm/sec, and compatible to the 1995 Hyogo-ken Nanbu earthquake and the 1948 Fukui earthquake.Resultantly, we found that the asperity models are available for estimating broad-band strong ground motions, and that the destructive strong motions in the area of the intensity 7 have velocity amplitude larger than 150 cm/sec.

预测强大的地面运动的大多数不确定性是建模未来地震的源异质性。我们提出的一种用于表征断层平面上异质滑动分布的方法是基于Somerville等人的地壳地震的滑移模型得出的经验源表征。（1999）。具有较大滑动的浅色区域是根据比1秒钟更长的地面运动记录的波形反转的滑动模型来定义的。使用这种方法，我们可以在断层表面上指定均匀滑动的缝隙，其大小受地震的整个地震力矩的约束。我们需要通过模拟宽带强的地面运动来调查阿斯伯特模型的有效性。在这项研究中，通过模拟1945年的Mikawa地震和2000年Tottori-Ken Senbu地震，在日本的模拟中，通过模拟了Mikawa地震的模拟，通过模拟Mikawa Enertications的启发，通过模拟强大的地震，通过模拟了米卡瓦的Senbu地震，可以通过模拟Mikawa Enertications的构成，通过模拟Mikawa Enertications的构成，通过模拟Mikawa Enertications的构成，通过模拟巨大的地震，通过模拟巨大的地震来检查，在1945年的Mikawa地震和2000年的Mikawa地震中，通过模拟了合成的启发，可以探讨源地震的有效性和适用性。大致对应于根据观察到的木制房屋塌陷比估计的地震强度的分布。 Furthermore, the peak velocity of the corresponding synthetic waveform is close to 150 cm/sec, and compatible to the 1995 Hyogo-ken Nanbu earthquake and the 1948 Fukui earthquake.Resultantly, we found that the asperity models are available for estimating broad-band strong ground motions, and that the destructive strong motions in the area of the intensity 7 have velocity amplitude larger than 150厘米/秒