A Comprehensive Study of Shear-Wave Splitting and Related Signals Using the Chi-Chi Earthquake Sequence
利用Chi-Chi地震序列对剪切波分裂及相关信号进行综合研究
基本信息
- 批准号:0124926
- 负责人:
- 金额:$ 16.39万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2002
- 资助国家:美国
- 起止时间:2002-01-01 至 2004-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This is a seismological study of shear-wave splitting in the source volume of the large Mw 7.6 Chi-Chi, Taiwan, earthquake of 1999. The study also investigates the guided fault zone waves, and non-linear wave propagation effects in damaged fault zone rock, using one of the best data sets in the world in a region of high natural seismicity. A comprehensive measurement is carried out on the stress-induced crustal anisotropy, augmented by other possible signatures of damaged fault zone material, and the project also evaluates the relationship of observations with (therefore predictive potential of) the occurrence of great earthquakes. The extensive data set is used that has been collected by the Taiwan Central Weather Bureau Seismic Network (CWBSN) from 1990 to 2000. Rigorous tests are conducted on the correlation of shear-wave splitting and on other signals with regional crustal stress variations and lapse time before and after the Mw 7.6 event. This data set extends back to 1970, providing a 30-year seismic database for monitoring the bulk crustal properties before, during, and after the Chi-Chi earthquake sequence. The CWBSN operates a network of more than 650-station (at 5-km station spacing) of 3-component, large dynamic range, and broadband accelerographs and a network of 75-station 3-component high-gain short-period seismometers. Thousands of M 3 events from the middle-lower crust have been beautifully recorded with excellent S/N ratios. For most M 3 earthquake in the data set, found that there are a number of recording stations directly above the source with epicentral distance less than 20 km. The software for this project performs particle polarization analysis and at the same time extracts the shear-wave spiltting delay times through an automated maximization of the cross-correlation function of the two matched horizontal component signals. This allows accurate measurements to be made for testing the idea of shear-wave splitting as a potential indicator for a large earthquake in the future. This research project has the potential of being more comprehensive and definitive than any shear-wave splitting work that has so far been done to date.
本文是1999年台湾集集7.6级大地震震源体剪切波分裂的地震学研究。 该研究还调查了被引导的断层带波,以及受损断层带岩石中的非线性波传播效应,使用了世界上天然地震活动性高的地区最好的数据集之一。 对应力引起的地壳各向异性进行了全面测量,并通过受损断层带材料的其他可能特征进行了增强,该项目还评估了观测结果与大地震发生的关系(从而预测可能性)。 使用的广泛的数据集,已收集的台湾中央气象局地震台网(CWBSN)从1990年至2000年。 对剪切波分裂等信号与区域地壳应力变化及地震前后时间的相关性进行了严格的检验。 该数据集可追溯到1970年,提供了一个30年的地震数据库,用于监测集集地震序列之前、期间和之后的地壳整体特性。 CWBSN运营着一个由650多个三分量、大动态范围和宽带加速度计台站(台站间距为5公里)组成的网络,以及一个由75个台站组成的三分量高增益短周期地震仪网络。 上千个中下地壳的M3地震都得到了很好的信噪比记录。 对于大部分3级地震的资料,发现有一批记录台站位于震源正上方,震中距小于20 km。 该项目的软件执行粒子偏振分析,同时通过两个匹配的水平分量信号的互相关函数的自动最大化来提取剪切波分裂延迟时间。 这使得精确的测量可以用来测试剪切波分裂作为未来大地震的潜在指标的想法。 这项研究项目有可能比迄今为止所做的任何剪切波分裂工作更全面和明确。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Ta-liang Teng其他文献
Ta-liang Teng的其他文献
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{{ truncateString('Ta-liang Teng', 18)}}的其他基金
Waveform Tomography from an Executed Big Footprint Experiment: The Chi-Chi (Taiwan) Earthquake
执行大足迹实验的波形断层扫描:Chi-Chi(台湾)地震
- 批准号:
0001016 - 财政年份:2000
- 资助金额:
$ 16.39万 - 项目类别:
Continuing Grant
Numerical and Field Experiments of Fault Zone Trapped Modes
断裂带俘获模式的数值与现场实验
- 批准号:
9105322 - 财政年份:1991
- 资助金额:
$ 16.39万 - 项目类别:
Continuing Grant
Study on the Process of a Propagating Rupture
扩展破裂过程的研究
- 批准号:
8904964 - 财政年份:1989
- 资助金额:
$ 16.39万 - 项目类别:
Continuing Grant
Application of the Optimum Telemetry System: Analyses of Seismograms Recorded by the Los Angeles Basin Seismic Network
最优遥测系统的应用:洛杉矶盆地地震台网记录的地震图分析
- 批准号:
8608997 - 财政年份:1986
- 资助金额:
$ 16.39万 - 项目类别:
Standard Grant
Engineering Application of Near-Field Strong Motion Calculations
近场强运动计算的工程应用
- 批准号:
8513446 - 财政年份:1985
- 资助金额:
$ 16.39万 - 项目类别:
Standard Grant
Lateral Inhomogeneities of the Crust and Upper Mantle in thePacific Ocean Basin
太平洋盆地地壳和上地幔的横向不均匀性
- 批准号:
8313678 - 财政年份:1984
- 资助金额:
$ 16.39万 - 项目类别:
Continuing Grant
Field Studies of Rock Microfracturing-Acoustic Emissions
岩石微破裂声发射现场研究
- 批准号:
8212750 - 财政年份:1983
- 资助金额:
$ 16.39万 - 项目类别:
Standard Grant
A Correlative Study of Seismicity and Groundwater Radon Content in Geothermal Wells in Taiwan, China
中国台湾地区地热井地震活动与地下水氡含量的相关性研究
- 批准号:
8306554 - 财政年份:1983
- 资助金额:
$ 16.39万 - 项目类别:
Standard Grant
Research on an Optimum Telemetry System
一种最优遥测系统的研究
- 批准号:
8306557 - 财政年份:1983
- 资助金额:
$ 16.39万 - 项目类别:
Standard Grant
Lateral Inhomogeneities of the Crust and Upper Mantle in The Eurasian and Pacific Plates
欧亚和太平洋板块地壳和上地幔的横向不均匀性
- 批准号:
8025723 - 财政年份:1981
- 资助金额:
$ 16.39万 - 项目类别:
Continuing Grant
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