| 四川盆地中部浅层地壳一维剪切波速度结构初步研究 |
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| 引用本文： | 谢军,倪四道,曾祥方.四川盆地中部浅层地壳一维剪切波速度结构初步研究[J].四川地震,2012(2):20-24. |
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| 作者姓名： | 谢军 倪四道 曾祥方 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院蒙城地球物理国家野外科学观测研究站,安徽合肥,230026
2. 中国科学院大地测量与地球物理研究所中科院动力大地测量学重点实验室,湖北武汉,430070 |
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| 摘 要： | 2010年1月31日四川盆地中部的遂宁发生了M5.0地震,四川盆地内部的台站观测到了很强的短周期面波波形数据。本文对地震数据的Rayleigh波和Love波提取基阶群速度频散曲线并反演得到四川盆地中部浅层地壳一维剪切波波速度结构。研究结果表明,四川盆地中部近地表剪切波平均速度约为2km/s,并且随深度逐渐增加,地壳深度在10km左右时,剪切波速度达到了3.5km/s。此结果适用于四川盆地中部以西,从遂宁到龙泉山附近,而四川盆地东部,从遂宁到华蓥山断裂不适用。该结果可为龙门山断裂附近的三维结构研究提供参考,并对强地面运动计算和区域内地震定位的研究有一定参考价值。
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| 关 键 词： | 四川盆地 面波频散 剪切波 |
1 D shear wave velocity structure of the shallow upper crust in central Sichuan Basin |
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| XIE Jun,NI Si-dao,ZENG Xiang-fang.1 D shear wave velocity structure of the shallow upper crust in central Sichuan Basin[J].Earthquake Research in Sichuan,2012(2):20-24. |
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| Authors: | XIE Jun NI Si-dao ZENG Xiang-fang |
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| Institution: | 1. Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Anhui Hefei 230026, China; 2 CAS Key laboratory of dynamic geodesy, Institute of Geodesy and Geophysics. Chinese Academy of Sciences, Hubei Wuhan 430077, China) |
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| Abstract: | An M5.0 earthquake occurred in Suining, Sichuan Province, on 31 January 2010. Strong short periods surface wave are recorded by Seismometers in Sichuan basin. We extract the fundamental dispersion cures of Rayleigh and Love＇s group velocity from those data. Then we inverse the shear wave velocity of central Sichuan basin. Our results show that near surface S wave average velocity of Sichuan Basin is about 2 km/s, and it increases with depth, reaches to 3.5 km/s at about 10 km depth. This structure is suitable from Suining to Longquanshan. The results are useful to both the prediction of strong ground motion and local epicenter determination. |
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| Keywords: | Sichuan Basin dispersion of surface wave shear wave |
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