1999年11月大同地震部分余震的定位及震源机制反演
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摘要
北京时间1999年11月1日21时25分在山西省大同县的堡村、西团堡村一带,即39°57′N,113°52′E发生了MS5.6的地震,随后发生一系列余震。本文使用近场观测资料对这次地震的部分余震进行了精确定位和震源机制解的测定。野外观测时间是从1999年11月7日到11月18日,精确定位结果显示此次余震活动分布于近东西走向的六棱山北麓断裂和北东走向的大王隐伏断裂及北西走向团堡断裂交汇带上,地理位置在六棱山东段的秋林村至大王村段约10km处。震源机制解的结果表明此部分余震的运动形态主要为倾滑断层。但是断层走向并不完全一致,余震的震源机制解反映了处于多个断层交汇处的复杂的构造应力状态。
An earthquake with magnitude M_S 5.6 hit the place between Pucun to Xituanpu,Datong county,Shanxi province in the first of November,1999.The aftershock sequence followed the main event.The location and mechanism of a part of the aftershocks were illustrated in this paper.The records of the aftershock sequence were from the eleventh of November to eighteenth.We have located 31 events which were well recorded and 18 of them which have clear waveform and were chosen to calculate the mechanism.The software of "Seismic Handler" and HYPO71 program was used for location.The moment tensor inversion program was used to calculated mechanism.The process of Moment Inversion is in frequency domain.The results of the location show that the aftershock sequence is at an intersection of almost EW strike Liulengshang fault,NE Dawang fault and NW TuanBao fault.The geographical position is between Quilin to Dawang about 10 kilometers.The mechanism shows that the movement of aftershock is on strike-slip fault.But the strikes are not at same orientation.Source mechanism come from aftershocks shows that the aftershocks occurred at the fault intersection and the stress field was complicated.
An earthquake with magnitude M_S 5.6 hit the place between Pucun to Xituanpu,Datong county,Shanxi province in the first of November,1999.The aftershock sequence followed the main event.The location and mechanism of a part of the aftershocks were illustrated in this paper.The records of the aftershock sequence were from the eleventh of November to eighteenth.We have located 31 events which were well recorded and 18 of them which have clear waveform and were chosen to calculate the mechanism.The software of "Seismic Handler" and HYPO71 program was used for location.The moment tensor inversion program was used to calculated mechanism.The process of Moment Inversion is in frequency domain.The results of the location show that the aftershock sequence is at an intersection of almost EW strike Liulengshang fault,NE Dawang fault and NW TuanBao fault.The geographical position is between Quilin to Dawang about 10 kilometers.The mechanism shows that the movement of aftershock is on strike-slip fault.But the strikes are not at same orientation.Source mechanism come from aftershocks shows that the aftershocks occurred at the fault intersection and the stress field was complicated.
引文
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丁文学等.2000.1999年山西大同-阳高地震宏观烈度考察报告[J].山西地震,1,2～6
李旭,陈运泰,王培德.1994.水平层状介质中理论地震图计算程序的使用说明[M].北京:国家地震局地球物理研究所
苏宗正,程新原.1992.1989年大同-阳高地震的地质环境与地震构造[J].山西地震,23～29
王国强,安卫平,兰青龙等.1992.1991年大同-阳高5.8级地震的地质环境与地质构造[J].山西地震,46～47
王培德,SKlaus.2001.1989年10月和1991年3月大同地震的活动断裂[J].地震地磁观测与研究,21,6,19～25
徐锡伟,邓起东.1988.晋北张性区盆岭构造及其形成的力学机制[J].中国地震,4,2,19～27
徐锡伟,吴卫民,张先康,马胜利,马文涛,于贵华,顾梦林,江娃利等著.2002.首都圈地区地壳最新构造变动与地震[M].北京:科学出版社
LeeWHKandLahr,JC.1972HYPO71(revised):Acomputerprogramfordeterminghypocenter,magnitudeandfristmo tionpatternoflocalearthquake[J].USGeologySurvey,Open FfileRept.73～311a
StammlerK.1993.SeismicHandle Programblemutichanneldatahandlerforinteracterandautomaticprocessingofseismologi calanalysese[J].ComputerandGeoscience,19(2):135～140
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