2005年江西九江—瑞昌M_S5.7地震破裂参数及余震静态应力触发研究
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摘要
根据地震破裂过程中的多普勒效应,利用多台波谱参数推算九江—瑞昌MS5.7地震的震源破裂参数,得到主震的破裂方位角φ0≈319.6,°破裂速度约为2.3 km/s,用最小二乘法拟合的相关系数极值约为0.80。在此基础上,分别计算了主震在4.8级强余震的两个节面上的静态库仑应力变化量,结果显示:主震在4.8级余震节面Ⅰ、Ⅱ上的静态库仑应力变化均为正值,分别为0.48 MPa和0.02 MPa。主震在节面Ⅰ、Ⅱ上产生的静态库仑应力的变化十分接近。应力增加的区域主要位于主震断层的右侧,应力减小的区域主要分布在震中南部。统计显示:绝大部分余震均发生在静态库仑应力增加的区域内,尤其是在节面Ⅰ上,表明主震破裂产生的库仑破裂应力变化对4.8级余震的发生有重要的触发作用,同时也有利于大多数余震的发生。
According to the Doppler Effect in the earthquake rupture process,we use the multi-station spectrum to calculate rupture parameters of the Jiujiang-Ruichang MS5.7 earthquake in Jiangxi.We get the results that the rupture azimuth is about 319.6°,the rupture velocity is about 2.3 km/s,and the fitted minimum correlation-coefficient is about 0.80 by minimum squares.And on this basis,We calculate the variation of static Coulomb stress separately in the two rupture planes of the MS4.8 aftershock.The results show that the variation of the static Coulomb stress separately on two nodal planes are positive,the values are about 0.48 MPa and 0.02 MPa respectively.The variations of static Coulomb stress on nodalⅠ and Ⅱ are very close.Stress-increasing area is mainly located on the right of the main earthquake fault.Stress-reducing area is mainly located to the south of the epicenter.Most of the aftershocks occur in the static Coulomb stress-increasing region,especially on the nodal.This shows the Coulomb failure stress variation caused by the main shock has an important role in triggering of the MS4.8 aftershock,and also conductive to majori aftershocks' occurrence.
According to the Doppler Effect in the earthquake rupture process,we use the multi-station spectrum to calculate rupture parameters of the Jiujiang-Ruichang MS5.7 earthquake in Jiangxi.We get the results that the rupture azimuth is about 319.6°,the rupture velocity is about 2.3 km/s,and the fitted minimum correlation-coefficient is about 0.80 by minimum squares.And on this basis,We calculate the variation of static Coulomb stress separately in the two rupture planes of the MS4.8 aftershock.The results show that the variation of the static Coulomb stress separately on two nodal planes are positive,the values are about 0.48 MPa and 0.02 MPa respectively.The variations of static Coulomb stress on nodalⅠ and Ⅱ are very close.Stress-increasing area is mainly located on the right of the main earthquake fault.Stress-reducing area is mainly located to the south of the epicenter.Most of the aftershocks occur in the static Coulomb stress-increasing region,especially on the nodal.This shows the Coulomb failure stress variation caused by the main shock has an important role in triggering of the MS4.8 aftershock,and also conductive to majori aftershocks' occurrence.
引文
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Reasenberg P A,Simpson R W.1992.Response of regional seismicity tothe static stress change produced by the Loma Prieta earthquake[J].Science,255:1687-1690.
陈学忠,王琼,刘冬英.2005.1995年河北沙城ML4.1级地震发震断层参数测定[J].地震,25(2):69-74.
丁国瑜,田勤俭,孔凡臣,等.1993.活断层分段--原则、方法及应用[M].北京:地震出版社.
环文林,常向东,黄纬琼.1990.地震危险性分析中的综合概率法[M].北京:地震出版社.
李传友,曾新福,张剑玺.2008.2005年江西九江5.7级地震构造背景与发震构造[J].中国科学(D辑):38(3):343-354.
刘桂萍,傅征祥.2000.1976年7月28日唐山7.8级地震触发的区域地震活动和静应力场变化[J].地震学报,22(1):17-26.
刘杰,郑斯华,黄玉龙.2003.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,25(2):211-218.
刘强,倪四道,秦嘉政,等.2007.2007年宁洱6.4级地震强余震库仑破裂应力触发研究[J].地震研究,30(4):331-335.
吕坚,郑勇,倪四道,等.2008.2005年11月26日九江-瑞昌MS5.7、4.8地震的震源机制及发震构造[J].地球物理学报,51(1):158-164.
吕坚,朱新运,高建华,等.2006.江西九江-瑞昌震区的尾波衰减特征初探[J].地震,26(4):15-21.
万永革,吴忠良,周公威,等.2002.地震应力触发研究[J].地震学报,24(5),533-551.
王椿镛,张先康,陈步云,等.1997.大别造山带地壳结构研究[J].中国科学(D辑),(3):221-226.
徐果明,周惠兰.1982.地震学原理[M].北京:科学出版社.
杨中书,曾文敬.2007.利用双差法对2005年江西九江-瑞昌5.7级地震序列重新定位[J].地震地磁观测与研究,28(2):25-31.
Abbodel-Fattah AK.2003.An approach to investigate earthquake ruptureprocesses[J].Acta.Geohpys.Pol.51(3):257-269.
Badawy A,Abbdel-Fattah A K.2001.Source parameter and fault planedetermination of the28th,Dec,1999northern Cairo earthquake[J].Tectonophysics,334(1-2):63-77.
Frankel A,Fletcher J,Vernon F,et al.1986.Rupture characteristics andtomographic source imaging ofML3earthquakes near Anza,southernCalifornia[J].JGR,91:12633-12650.
Hardebeck J L,Nazareth J J,Huaksson E.1998.The static stress changetriggering model:Constraints from two southern California aftershocksequences[J].JGR,98:4461-4472.
Harris,R A.1998.Introduction to special section:Stress triggers,stressshadows,and implications for seismic hazard[J].JGR,103:24347-24348.
King G C P,Stein R S,Lin J.1994.Static stress changes and the trigge-ring of earthquakes[J].BSSA,84:935-953.
Nakamura Y.1989.A method for dynamic characteristics estimation ofsubsurface using microtremor on the ground surface[J].QuarterlyReport of Railway Technical Research Institute,30(1):25-33.
Okada Y.1992.Internal deformation due to shear and tensile faults in ahalf-space[J].BSSA,82:1018-1040.
Reasenberg P A,Simpson R W.1992.Response of regional seismicity tothe static stress change produced by the Loma Prieta earthquake[J].Science,255:1687-1690.
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