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| 2011年安庆4.8级地震序列S波分裂研究 | |
| 引用本文： | 李玲利,陈浩朋,刘泽民,倪红玉,洪德全.2011年安庆4.8级地震序列S波分裂研究[J].地震,2012,32(3):28-36. |
| 作者姓名： | 李玲利 陈浩朋 刘泽民 倪红玉 洪德全 |
| 作者单位： | 1. 中国科学技术大学,安徽合肥230000;安徽省地震局,安徽合肥230031;蒙城地球物理国家野外科学观测研究站,安徽蒙城233500 2. 武汉大学测绘学院,湖北武汉,430079 3. 安徽省地震局,安徽合肥,230031 4. 安徽省地震局,安徽合肥230031;蒙城地球物理国家野外科学观测研究站,安徽蒙城233500 |
| 基金项目： | 安徽省地震局科研重点基金项目资助 |
| 摘 要： | 采用互相关系数法,计算了2011年安庆Ms4.8地震的余震S波分裂参数.结果表明,余震序列的S波分裂现象明显,快S波平均偏振方向在近NNW向,与区域最大水平主压应力方向基本一致.通过分析延迟时间随时间的变化趋势,可以看出Ms4.8地震后有明显的应力释放现象.在几次较大余震前,观测到延迟时间呈现增加的特征,并且其中一次余... |
| 关 键 词： | S波分裂 延迟时间 2011年安庆Ms4.8地震 |
Shear Wave Splitting Analysis of the 2011 Anqing Ms4.8 Earthquake Sequence |
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| LI Ling-li , CHEN Hao-peng , LIU Ze-min , Ni Hong-yu , HONG De-quan.Shear Wave Splitting Analysis of the 2011 Anqing Ms4.8 Earthquake Sequence[J].Earthquake,2012,32(3):28-36. | |
| Authors: | LI Ling-li CHEN Hao-peng LIU Ze-min Ni Hong-yu HONG De-quan |
| Institution: | 2,4(1.University of Science and Technology of China,Hefei 230006,China;2.Earthquake Administration of Anhui Province,Hefei 230032,China;3.School of Geodesy and Geomatics,Wuhan University, Wuhan 430079,China;4.Mengcheng National Geophysical Observatory, Mengcheng 233500,China) |
| Abstract: | Using correlation coefficient method,a study of shear wave splitting is made through the recording of aftershocks of the Anqing MS4.8 earthquake,Anhui province in 2011.The results show that the preponderant polarization of the fast shear wave is NNW.It accords with the regional predominant direction of principal compressional stress.By analyzing the change of S wave time delay,obvious stress relaxation could be seen after the MS4.8 earthquake.The time delay basically increases before strong aftershocks.However,it was observed that the time delay decreased abruptly immediately before one strong aftershock.It is coincident with the conclusion that long-term stress accumulation and short-term stress relaxation existed before earthquakes.It is significant for the short-term earthquake prediction that the time delay decreases before strong earthquakes.The result suggests that parameters of shear wave splitting may reflect the dynamic change of regional stress field and provide useful information for the study of stress field and earthquake prediction. |
| Keywords: | Shear wave splitting Time delay the 2011 Anqing MS4 8 earthquake |
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