| 利用重复地震P波走时差观测地壳介质的微动态 |
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| 引用本文： | 张致伟,程万正,吴朋,周龙泉.利用重复地震P波走时差观测地壳介质的微动态[J].中国地震,2010,26(4). |
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| 作者姓名： | 张致伟 程万正 吴朋 周龙泉 |
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| 作者单位： | 1. 四川省地震局,成都市人民南路三段29号,610041
2. 中国地震台网中心,北京,100045 |
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| 基金项目： | 中国地震局2010年度跟踪课题 |
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| 摘 要： | 基于研究区域地震震相到时资料及地震波数据,给出了两个局部地区地壳介质微动态变化的实例。一个是汶川8.0级地震起始破裂区域,即A区;另一个是三岔口地区,即B区,该区域为活动断裂交汇部位,未发生过大地震,但近年来中小地震频繁。分析A区后发现,在汶川8.0级地震前,部分台站观测的地壳介质微动态出现了中短期异常,震源区正东及北东方向波速升高,反映出地壳介质受到显著挤压而处于硬化阶段;震源区西南方向的波速则比较稳定。分析B区后发现,可能受到汶川8.0级地震的影响,部分台站给出的计算结果在地震前后发生了变化,显示出不同方位地壳介质承压状态的差异。
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| 关 键 词： | 重复地震 精定位 P波走时 地壳介质 射线追踪 |
Monitoring micro-dynamic of the crustal medium by using P-wave travel-time difference of repeating earthquakes |
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| Zhang Zhiwei,Cheng Wanzheng,Wu Peng,Zhou Longquan.Monitoring micro-dynamic of the crustal medium by using P-wave travel-time difference of repeating earthquakes[J].Earthquake Research in China,2010,26(4). |
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| Authors: | Zhang Zhiwei Cheng Wanzheng Wu Peng Zhou Longquan |
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| Institution: | Zhang Zhiwei1) Cheng Wanzheng1) Wu Peng1) Zhou Longquan2) 1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2) China Earthquake Networks Center,Beijing 100036,China |
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| Abstract: | Based on seismic phase arrival time and waveform data of regional earthquakes,the crustal medium micro-dynamic of two local regions are given.One is the initial rupture area of the Wenchuan MS8.0 earthquake,namely region A;the other is the Sanchakou area,namely region B.Region B is an intersection part of active faults,which had no great earthquake,but the activities of moderate and small earthquakes were frequent in recent years.The analysis of region A finds that the micro-dynamic of crustal medium appear... |
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| Keywords: | Repeating earthquakes Accurate location P-wave travel-time difference Micro-dynamic of the crustal medium Ray tracing |
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