| Estimation of seismic stress drop from the peak velocity of ground motion |
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| 作者姓名： | 秦嘉政 刘祖荫 钱晓东 谢庆茵 |
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| 作者单位： | JIA ZHENG QIN ZU YIN LIU XIAO DONG QIAN QING YIN XIESeismological Bureau of Yunnan Province，Kunming 650041，China |
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| 摘 要： | ＥｓｔｉｍａｔｉｏｎｏｆｓｅｉｓｍｉｃｓｔｒｅｓｄｒｏｐｆｒｏｍｔｈｅｐｅａｋｖｅｌｏｃｉｔｙｏｆｇｒｏｕｎｄｍｏｔｉｏｎＪＩＡＺＨＥＮＧＱＩＮ（秦嘉政）ＺＵＹＩＮＬＩＵ（刘祖荫）ＸＩＡＯＤＯＮＧＱＩＡＮ（钱晓东）ＱＩＮＧＹＩＮＸＩＥ（谢庆...
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| 收稿时间： | 15 May 1996 |
| 修稿时间： | 2 January 1997 |
Estimation of seismic stress drop from the peak velocity of ground motion |
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| Jia-Zheng Qin, Zu-Yin Liu, Xiao-Dong Qian and Qing-Yin Xie.Estimation of seismic stress drop from the peak velocity of ground motion[J].Acta Seismologica Sinica(English Edition),1997,10(5):581-591. |
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| Authors: | Jia-Zheng Qin Zu-Yin Liu Xiao-Dong Qian and Qing-Yin Xie |
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| Institution: | (1) Seismological Bureau of Yunnan Province, 650041 Kunming, China |
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| Abstract: | According to the source dislocation model suggested by Brune(1970), the authors have calculated the displacement spectra of
S-wave and source parameters of the Heqing M
s 5.3 earthquake sequence, using the digital data of this sequence obtained in the Western Yunnan Earthquake Prediction Experimental
Field (WYEPEF). Based on this calculation we have studied the dependence of the peak velocity (rv) of ground motion on the seismic stress drop Δσ. From the seismic scaling law we obtained (rv) ∞Δσ
2/3, thus the three formulae of calculating seismic stress drop Δσ using the peak velocity parameters can be derived: lg(rv)=d1+1/3lgM
0+2/lgΔσ lg(rv)=d2+1/3M
L+2/3lgΔσ=-1.0+1.5lg(rv). Assuming that the average stress drop Δσ=3.0×106 Pa for great and small earthquakes, then the constants d
1= −3.88 and d
2=−0.38 are determined by the observational data of the Heqing M
s5.3 sequence. Results of the source parameters for this sequence show that the seismic moment M
0 is between 1011 N · m and 1015 N · m, the rupture radius a of the source is between 200 m and 600 m, the stress drop Δσ is between 0.1 MPa and 10 MPa and the average stress drop Δσ=3.7 MPa calculated from the peak velocity parameter of the ground motion. Δσ values measured from these scaling relations are basically in agreement with the results given by Brune’s method (1970).
Results of this study show that the dependence of the ground motion peak velocity parameter (rv) on the stress drop Δσ is even stronger than that on the seismic moment M
0.
This subject is supported by the “Key problem of the 8th-Five Plan of the State Seismological Bureau of China”. |
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| Keywords: | seismic moment stress drop peak velocity earthquake sequence |
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