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| 中国东西部地区震后形变有效松弛时间研究 | |
| 引用本文： | 郝明,王庆良,占伟,李煜航.中国东西部地区震后形变有效松弛时间研究[J].大地测量与地球动力学,2011,31(6):49-53. |
| 作者姓名： | 郝明 王庆良 占伟 李煜航 |
| 作者单位： | 1. 中国地震局第二监测中心,西安710054;中国地震局地质研究所,北京100029 2. 中国地震局第二监测中心,西安,710054 3. 中国地震局第一监测中心,天津,300180 |
| 基金项目： | 国家自然科学基金，中国地震局地震行业科研专项 |
| 摘 要： | 顾及脆性转换带上的断层蠕动及其深部黏滞流对震后地表位移的影响,对5次大地震的震后垂直位移进行了最小二乘反演,并估计了有效松弛时间.反演结果表明,中国东、西部地震的有效松弛时间差异很大,其中唐山地震的有效松弛时间最长(10.3年),邢台地震次之(4.4年),而西部通海、炉霍、共和等3次地震的有效松弛时间则仅为2年多.究其... |
| 关 键 词： | 震后形变 指数衰减 松弛时间 地壳厚度 黏滞系数 |
ON EFFECTIVE RELAXATION TIME OF POSTSEISMIC DEFORMATION IN EASTERN AND WESTERN CHINA |
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| Hao Ming,Wang Qingliang,Zhan Wei,Li Yuhang.ON EFFECTIVE RELAXATION TIME OF POSTSEISMIC DEFORMATION IN EASTERN AND WESTERN CHINA[J].Journal of Geodesy and Geodynamics,2011,31(6):49-53. | |
| Authors: | Hao Ming Wang Qingliang Zhan Wei Li Yuhang |
| Institution: | 1) 1)Second Crustal Monitoring and Application Center,Xi’an 710054 2)Institute of Geology,China Earthquake Administration,Beijing 100029 3)First Crustal Monitoring and Application Center,Tianjin 300180 |
| Abstract: | The post seismic deformation,observed by precise leveling,of Ms7.2 Xingtai earthquake in 1966, Ms7.8 Tangshan earthquake in 1976, Ms7.8 Tonghai earthquake in 1970, Ms7.6 Luhuo earthquake in 1973 and Ms7.0 Gonghe earthquake in 1990 each shows typical characteristics of decaying exponential. Considering both the effects of fault creep on the brittle creeping fault zone (BCFZ) and viscous flow below BCFZ,we estimate the effective relaxation time of the five great earthquakes with least square method. The inversion results show that the difference of relaxation time between eastern and western China is very significant. The effective relaxation time of Tangshan earthquake is the longest (10.3 years), and the time of Xingtai earthquake is the second longest (4.4 years), while the effective relaxation time of Tonghai, Luhuo and Gonghe earthquake are about 2 years only. The significant difference may be caused by different upper crustal depth and viscosity of lower crust and upper mantle between eastern and western China. |
| Keywords: | post-seismic deformation decaying exponential relaxation time crustal depth viscosity |
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