云南双震型地震序列震源参数特征研究
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摘要
采用云南区域测震台网资料,运用布伦模式方法测算云南地区震源参数,对盐津、腾冲和川滇交界地区3个典型的双震型地震序列震源参数进行了综合分析研究。结果表明双震型地震震源参数中,首次强震的应力降较低,可能是受震源区存在障碍体的影响,构造应力未能在首次地震中得以完整释放,再次发震其应力降值较高,表明已突破障碍体。从地震预测角度,首次地震的应力降大小,可以初步判定震区未来是否可能再次发震。
Basing on the data in Yunnan Regional Seismic Network,we calculated the source parameters of 2 533 3. 0≤M( L,S)≤6. 6 earthquakes in Yunnan from 1999 to 2013 by Brune circle model method,and analyzed the source parameters of three typical double shock earthquake sequence in the junction area of Yanjin,Tengchong and Yunnan-Sichuan. The result shows that in the source parameter of double shock earthquakes,the stress drop of the first shock is lower,which indicate the tectonic stress cannot be fully released by the effects of the existence of obstacle in focal region,however,the stress drop of the second shock is much higher than the first one,which indicate the obstacle has been broken through. In the aspect of earthquake prediction,the scaling of stress drop of the first shock can be used to make a preliminary determination whether the earthquake would happen again in focal region.
Basing on the data in Yunnan Regional Seismic Network,we calculated the source parameters of 2 533 3. 0≤M( L,S)≤6. 6 earthquakes in Yunnan from 1999 to 2013 by Brune circle model method,and analyzed the source parameters of three typical double shock earthquake sequence in the junction area of Yanjin,Tengchong and Yunnan-Sichuan. The result shows that in the source parameter of double shock earthquakes,the stress drop of the first shock is lower,which indicate the tectonic stress cannot be fully released by the effects of the existence of obstacle in focal region,however,the stress drop of the second shock is much higher than the first one,which indicate the obstacle has been broken through. In the aspect of earthquake prediction,the scaling of stress drop of the first shock can be used to make a preliminary determination whether the earthquake would happen again in focal region.
引文
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陈学忠,王小平,王林瑛,等.2003.地震视应力用于震后趋势快速判定的可能性[J].国际地震动态,(7):1-4.
皇甫岗,陈颙,秦嘉政,等.2010.云南地震活动性[M].昆明:云南科技出版社,94-107.
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叶建庆,陈慧,刘学军,等.2008.2006年云南盐津5.1级双震的监测与研究[J].地震研究,31(2):134-141.
郑治真.1983.波谱分析基础[M].北京:地震出版社,238-299.
中国地震局.1998.地震现场工作大纲和技术指南[M].北京:地震出版社,25-26.
钟羽云,张帆,张震峰,等.2004.应用强震应力降和视应力进行震后趋势快速判定的可能性[J].防震减灾工程学报,24(1):8-14.
Brune J.N..1970.Tectonic stress and the spectra of seismic shear wavesfrom earthquakes[J].J.Geophys.Res.,75(26):4997-5009
Das S.,Aki K..1977.Fault Plane with Barriers:A versatile EarthquakeModel[J].Journal of Geophysical Research,82(36):5658-5670.
陈学忠,王小平,王林瑛,等.2003.地震视应力用于震后趋势快速判定的可能性[J].国际地震动态,(7):1-4.
皇甫岗,陈颙,秦嘉政,等.2010.云南地震活动性[M].昆明:云南科技出版社,94-107.
秦嘉政,阚荣举.1986.用近震尾波估算昆明及其周围地区的Q值和地震矩[J].地球物理学报,29(2):145-156.
时振梁,张少泉,赵荣国,等.1992.地震工作手册[M].北京:地震出版社,265-267.
苏有锦,刘杰,郑斯华,等.2006.云南地区S波非弹性衰减Q值研究[J].地震学报,28(2):206-212.
吴忠良,黄静,林碧苍.2002.中国西部地震视应力的空间分布[J].地震学报,24(3):293-301.
叶建庆,陈慧,刘学军,等.2008.2006年云南盐津5.1级双震的监测与研究[J].地震研究,31(2):134-141.
郑治真.1983.波谱分析基础[M].北京:地震出版社,238-299.
中国地震局.1998.地震现场工作大纲和技术指南[M].北京:地震出版社,25-26.
钟羽云,张帆,张震峰,等.2004.应用强震应力降和视应力进行震后趋势快速判定的可能性[J].防震减灾工程学报,24(1):8-14.
Brune J.N..1970.Tectonic stress and the spectra of seismic shear wavesfrom earthquakes[J].J.Geophys.Res.,75(26):4997-5009
Das S.,Aki K..1977.Fault Plane with Barriers:A versatile EarthquakeModel[J].Journal of Geophysical Research,82(36):5658-5670.
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