| Characteristics of foreshock and its identi-fication |
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| 作者姓名： | 王林瑛 陈佩燕 吴忠良 白彤霞 |
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| 作者单位： | Institute of Geophysics，China Earthquake Administration，Beijing100081，China，Institute of Geophysics，China Earthquake Administration，Beijing100081，China，Institute of Geophysics，China Earthquake Administration，Beijing100081，China，Earth Science Center of Graduate School，Chinese Academy of Sciences，Beijing100039，China，Institute of Geophysics，China Earthquake Administration，Beijing100081，China |
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| 基金项目： | Key Project of State Science and Technology in the tenth Five-year Plan (2001BA601B01-01-02). |
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| 摘 要： | Introduction The characteristics of generalized foreshock and direct foreshock and their identification,as well as their application to medium and short-term prediction of strong earthquake is a major study objective in seismometry both in China and abroad.China has made many short-term and imminent earthquake predictions.Among the ones with clear hazard-mitigating effect and social manifestation,direct foreshock has made an obvious contribution,for example,the MS=7.2Menglian earthquake occu…
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| 收稿时间： | 11 September 2003 |
| 修稿时间： | 21 September 2004 |
Characteristics of foreshock and its identification |
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| WANG Lin-ying,CHEN Pei-yan,WU Zhong-liang,BAI Tong-xia.Characteristics of foreshock and its identi-fication[J].Acta Seismologica Sinica(English Edition),2005,18(2):180-188. |
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| Authors: | WANG Lin-ying CHEN Pei-yan WU Zhong-liang BAI Tong-xia |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;Earth Science Center of Graduate School, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | In the paper, we analyze 117 moderate-strong earthquakes occurred in Chinese mainland (M
S≥5.5 in the east and M
S≥6.0 in the west) since 1970, among them, 11 earthquakes (about 9%) have direct foreshocks and 63 earthquakes (about 51%)
have generalized foreshocks. The predominant time interval between foreshock and main earthquake is no more than 30 days with
a spatial distance less than 50 km and a magnitude difference over 1. From the digital seismic data in liaoning Province,
we know that direct foreshock had an obvious shear-stress background before the M
S=5.6 and M
S=5.1 Xiuyan earthquakes occurred on Nov. 29, 1999 and Jan.15, 2000.
Foundation item: Key Project of State Science and Technology in the tenth Five-year Plan (2001BA601B01-01-02).
Contribution No. 05FE3008, Institute of Geophysics, China Earthquake Administration. |
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| Keywords: | direct foreshock generalized foreshock ambient shear stress |
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