| Study on shear wave splitting in the aftershock region of the Yao＇an earthquake in 2000 |
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| 引用本文： | 王新岭,刘杰,张国民,马宏生,王辉.Study on shear wave splitting in the aftershock region of the Yao＇an earthquake in 2000[J].地震学报(英文版),2006,19(2):123-135. |
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| 作者姓名： | 王新岭 刘杰 张国民 马宏生 王辉 |
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| 作者单位： | [1]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China [2]China Earthquake Network Center, China Earthquake Administration, Beijing 100081, China |
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| 基金项目： | National Program on Key Basic Projects （2004CB418406） and Program for the tenth Five-year Plan of China （2004BA601 B01-04-03）. |
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| 摘 要： | After Ms=6.5 Yao＇an earthquake on January 15, 2000, a large amount of aftershock waveforms were recorded by the Near Source Digital Seismic Network （NSSN） installed by Earthquake Administration of Yunnan Province in the aftershock region. It provides profuse data to systematically analyze the features of Yao＇an earthquake. The crustal anisotropy is realized by shear wave splitting propagating in the upper crust. Based on the accurate aftershock relocations, the shear wave splitting parameters are determined with the cross-correlation method, and the results of different stations and regions are discussed in this paper. These conclusions are obtained as follows： firstly, the average fast directions of aftershock region are controlled by the regional stress field and parallel to the maximum horizontal compressive stress direction; secondly, the average fast directions of disparate stations and regions are different and vary with the structural settings and regional stress fields; finally, delay time value is affected by all sorts of factors, which is affinitive with the shear wave propagating medium, especially.
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| 关 键 词： | 地震 剪切波 余震 震波 延时 |
| 文章编号： | 1000-9116（2006）02-0123-13 |
| 收稿时间： | 2005-03-21 |
| 修稿时间： | 2006-01-12 |
Study on shear wave splitting in the aftershock region of the Yao’an earthquake in 2000 |
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| Wang Xin-ling , Liu Jie , Zhang Guo-min , Ma Hong-sheng and Wang Hui.Study on shear wave splitting in the aftershock region of the Yao’an earthquake in 2000[J].Acta Seismologica Sinica(English Edition),2006,19(2):123-135. |
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| Authors: | Wang Xin-ling Liu Jie Zhang Guo-min Ma Hong-sheng and Wang Hui |
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| Institution: | (1) Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China;(2) China Earthquake Network Center, China Earthquake Administration, Beijing, 100081, China |
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| Abstract: | After M
S=6.5 Yao’an earthquake on January 15, 2000, a large amount of aftershock waveforms were recorded by the Near Source Digital
Seismic Network (NSSN) installed by Earthquake Administration of Yunnan Province in the aftershock region. It provides profuse
data to systematically analyze the features of Yao’an earthquake. The crustal anisotropy is realized by shear wave splitting
propagating in the upper crust. Based on the accurate aftershock relocations, the shear wave splitting parameters are determined
with the cross-correlation method, and the results of different stations and regions are discussed in this paper. These conclusions
are obtained as follows: firstly, the average fast directions of aftershock region are controlled by the regional stress field
and parallel to the maximum horizontal compressive stress direction; secondly, the average fast directions of disparate stations
and regions are different and vary with the structural settings and regional stress fields; finally, delay time value is affected
by all sorts of factors, which is affinitive with the shear wave propagating medium, especially.
Foundation item: National Program on Key Basic Projects (2004CB418406) and Program for the tenth Five-year Plan of China (2004BA601B01-04-03). |
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| Keywords: | crustal anisotropy shear wave cross-correlation method fast direction delay time |
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