| Application of observed strain steps to the study of remote earthquake stress triggering |
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| 作者姓名： | 邱泽华 石耀霖 |
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| 作者单位： | Institute of Crustal Dynamics，China Earthquake Administration，Beijing 100085，China，Graduate School of Chinese Academy of Sciences，Beijing 100039，China |
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| 基金项目： | NationalNaturalScienceFoundationofChina(40374011)，JointSeismologicalFoundationofChina(1040037)andInvestigatingActiveFaultsinMajorCitiesProgram. |
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| 摘 要： | IntroductionModernseismologysuggeststhatearthquakesarecausedbyfaultslippingtriggeredbytec-tonicstressesaccumulatedtoacertainextent;andthefaultslip,inturn,releasesstresses.Infact,whenanintensivequakeoccurs,thefracturingoftheseismogenicfaultdoesnotleadtothereleaseofallthestressesbut,accordingtothegeometricrelationsamongthefaults,releasesstressesonsomeofthefaultstomakethemmorestable,whileaccumulatesstressesonotherfaultstomakethemtendtoslip.Asanapproximation,thestrengthofthefaulttobeysByerleylawby…
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| 收稿时间： | 31 March 2003 |
| 修稿时间： | 20 November 2003 |
Application of observed strain steps to the study of remote earthquake stress triggering |
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| Qiu Ze-hua,and Shi Yao-lin.Application of observed strain steps to the study of remote earthquake stress triggering[J].Acta Seismologica Sinica(English Edition),2004,17(5):534-541. |
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| Authors: | Qiu Ze-hua and Shi Yao-lin |
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| Institution: | 1. Institute of Crustal Dynamics,China Earthquake Administration,Beijing,100085,China
2. Graduate School of Chinese Academy of Sciences,Beijing,100039,China |
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| Abstract: | A study of the Kunlunshan earthquake of MS = 8.1 based on observed coseismic strain steps from the borehole strain monitoring network over China has been carried out with some interesting results. Firstly, many recordings disagree with theoretic calculation using static dislocation model. Secondly, abnormally large strain steps are ob-served at quite a few stations in the tectonically active east-northern China, while in the relatively inactive east-southern China no obvious steps are recorded. It is inferred that seismic stress triggering may significantly affect remote seismic strain field. In other words, whether remote faulting be seismically triggered or not may de-termine the pattern of local seismic strain changes. Further comparison study results of March 11, 1999 Zhangbei earthquake and November 1, 1999 Datong earthquake show that the specific pattern of seismic zones has obvious influence on seismic strain changes in the region. This supports the idea that observed abnormal strain steps might be produced by coseismicly stress-triggered local faulting. |
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| Keywords: | stress triggering strain observation seismic stress step |
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