| Characteristics of ambient stress values for micro－earthquake sequences in Western Yunnan Earthquake Prediction Experimental Field |
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| 引用本文： | 秦嘉政,刘阻荫,蒋乐群.Characteristics of ambient stress values for micro－earthquake sequences in Western Yunnan Earthquake Prediction Experimental Field[J].地震学报(英文版),1995,8(4):563-574. |
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| 作者姓名： | 秦嘉政 刘阻荫 蒋乐群 |
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| 作者单位： | Seismological Bureau of Yunnan Province，Kunming 650041，China |
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| 摘 要： | Ｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆａｍｂｉｅｎｔｓｔｒｅｓｓｖａｌｕｅｓｆｏｒｍｉｃｒｏ－ｅａｒｔｈｑｕａｋｅｓｅｑｕｅｎｃｅｓｉｎＷｅｓｔｅｒｎＹｕｎｎａｎ Ｅａｒｔｈｑｕａｋｅ Ｐｒｅｄｉｃｔｉｏｎ Ｅｘｐｅｒｉｍｅｎｔａｌ ＦｉｅｌｄＪｉａ－Ｚ...
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| 收稿时间： | 23 July 1994 |
| 修稿时间： | 17 October 1994 |
Characteristics of ambient stress values for micro-earthquake sequences in Western Yunnan Earthquake Prediction Experimental Field |
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| Jia-Zheng Qin, Zu-Yin Liu and Le-Qun Jiang.Characteristics of ambient stress values for micro-earthquake sequences in Western Yunnan Earthquake Prediction Experimental Field[J].Acta Seismologica Sinica(English Edition),1995,8(4):563-574. |
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| Authors: | Jia-Zheng Qin Zu-Yin Liu and Le-Qun Jiang |
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| Institution: | (1) Seismological Bureau of Yunnan Province, 650041 Kunming, China |
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| Abstract: | According to the source velocity spectrum model suggested by Chen and Duda (1993), the method of directly measuring the maximum
value <Vc (cm) >max of the velocity spectrum from the seismic momentM
0 has been studied. The authors have measured the seismic momentM
0 and source mechanical parameters of three microearthquake sequences, the Er’ yuan, Maidi and Songgui sequences, by use of
the digital data of these sequences obtained by near-field observation in the Western Yunnan Earthquake Prediction Experimental
Field (WYEPEF). The magnitudesM
L of the three micro-earthquake sequences are mostly between 1.0 and 2.5, the measured seismic momentM
0 is between 1010N · m and 1013N · m, and the rupture radius a of the source between 90 m and 270 m. The study of the ambient stress parametersτ
0 and Δ
σ
shows that the ground motion peak velocityr ·v is a function of the ambient stress parametersτ
0 and Δ
σ
, while the ambient stresses are related to the seismotectonics and the media states in turn. The values of ambient stress
parametersτ
0 and Δ
σ
for the three earthquake sequences are between 0.5–5.0 MPa for the high stress earthquake swarm (Maidi sequence), between
0.3–1.5 MPa for the moderate stress swarm (Songgui sequence), and between 0.01–0.5 MPa for the low stress swarm (Er’ yuan
sequence). We have further discussed the dependence of the high, moderate and low stress states on the tectonics and on the
difference in media state. This study can help us to understand deeply the relation that the features of ambient stress states
bear with the seismogenic process and the potential earthquake risk zone. Besides, the authors have also found that there
is an obvious difference between the moment scaling laws for large and small earthquakes. The scaling law between the peak
velocityr ·v and the seismic momentM
0 isr ·v∞M
00.6 whenM
0>1014 (N · m), but isr ·v∞M
0
1/2
whenM
0<1014 (N · m).
This study was supported by the grant of the Eighth-Five key Programs, State Seismological Bureau (SSB). |
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| Keywords: | Seismic moment seismic sequence ambient stress Western Yunnan velocity spectrum model |
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