| Changes in source parameters of foreshocks and aftershocks of the 2001 Ms=6.0 Yajiang,Sichuan, earthquake |
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| 作者姓名： | 程万正 陈天长 魏娅玲 朱航 |
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| 作者单位： | SeismologicalBureauofSichuanProvince,Chengdu610041,China |
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| 摘 要： | In this paper changes in focal mechanisms) parameters of wave spectra, and stress drops for the Ms=5.0 forcshock and Ms=6.0 mainshock in February 2001 in Yajiang County, Sichuan, and seismicity in cpiccntral region are studied. Comparison of focal mechanisms for the Yajiang earthquakes with distribution patterns of aftcrshocks, the nodal plane Ⅰ, striking in the direction of NEN, of the Yajiang M=5.0 event is chosen as the faulting plane, the nodal plane Ⅱ, striking in the direction of WNW, of the M=6.0 event as the faulting plane. The strikes of the two faulting planes are nearly perpendicular to each other. The level of stress drops in the cpicentral region before the occurrence of the M=6.0 earthquake increases, which is consistent with increase of seismicity in the epicentral region. The rate decay of the Yajiang earthquake sequence, changes in wave spectra for foreshocks and aftershocks,and focal mechanisms are complex.
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| 关 键 词： | 地震 序列特征 源参数 前震 余震 中国 四川 波谱 震源 |
| 收稿时间： | 10 July 2002 |
| 修稿时间： | 5 March 2003 |
Changes in source parameters of foreshocks and aftershocks of the 2001 M S=6.0 Yajiang, Sichuan, earthquake |
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| Cheng Wan-zheng , Chen Tian-chang , Wei Ya-ling and Zhu Hang.Changes in source parameters of foreshocks and aftershocks of the 2001 Ms=6.0 Yajiang,Sichuan, earthquake[J].Acta Seismologica Sinica(English Edition),2003,16(4):371-381. |
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| Authors: | Cheng Wan-zheng Chen Tian-chang Wei Ya-ling and Zhu Hang |
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| Institution: | (1) Seismological Bureau of Sichuan Province, 610041 Chengdu, China |
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| Abstract: | In this paper changes in focal mechanisms, parameters of wave spectra, and stress drops for the M
S=5.0 foreshock and M
S=6.0 mainshock in February 2001 in Yajiang County, Sichuan, and seismicity in epicentral region are studied. Comparison of
focal mechanisms for the Yajiang earthquakes with distribution patterns of aftershocks, the nodal plane I, striking in the
direction of NEN, of the Yajiang M=5.0 event is chosen as the faulting plane; the nodal plane II, striking in the direction of WNW, of the M=6.0 event as the faulting plane. The strikes of the two faulting planes are nearly perpendicular to each other. The level
of stress drops in the epicentral region before the occurrence of the M=6.0 earthquake increases, which is consistent with increase of seismicity in the epicentral region. The rate decay of the
Yajiang earthquake sequence, changes in wave spectra for foreshocks and aftershocks, and focal mechanisms are complex.
Foundation item: State Key Basic Development and Programming Project “Mechanism and Prediction of Continental Strong Earthquakes” (95130505). |
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| Keywords: | Yajiang earthquake sequence characteristics source parameters |
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