2016年7月31日广西苍梧5.4级地震测震学异常研究
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摘要
2016年7月31日广西苍梧县发生5.4级地震,震源深度10 km,宏观震中位于苍梧县沙头镇。此次地震发生在地震监测能力较好的中等地震活动区,打破了东南沿海地震带长达17年5级地震平静,对东南沿海地震带地震活动具有重要指示意义。在收集苍梧地震前广西及邻区地震地质和地震活动资料基础上,较系统分析了此次地震序列和测震学指标异常的特征,结果显示:苍梧5.4级地震属孤立型地震序列,震前3年广西及邻区出现小震活动增强、小震群活跃、"平果地震窗"开窗及地震活动性参数时间扫描等中期异常,短临异常不明显。
On July 31st, 2016, an M_S 5.4 earthquake occurred in Cangwu county, Guangxi province, with the focal depth of 10 km, and the macro epicenter was located in Shatou town, Cangwu county. The earthquake occurred in a moderate seismic activity area with relatively good seismic monitoring capability. For the Cangwu M_S 5.4 Earthquake has broken the calmness of the southeast coastal earthquake belt for 17 years, it is of great significance to study the seismic activity of the earthquake. Based on the seismic geological and seismic activity data of Guangxi and adjacent areas, this paper systematically analyzed the characteristics of the earthquake sequence and seismograph anomalies before the earthquake. The results shows that: the Cangwu M_S 5.4 Earthquake sequence belongs to isolated earthquake sequence, there had been such medium-term anomalies assmall earthquakes increasement, small earthquakes group activity, "Pingguo seismic window" opening window and seismic parameters time scanning 3 years before the earthquake in Guangxi and its adjacent area, but the short imminent anomalies is not obvious.
On July 31st, 2016, an M_S 5.4 earthquake occurred in Cangwu county, Guangxi province, with the focal depth of 10 km, and the macro epicenter was located in Shatou town, Cangwu county. The earthquake occurred in a moderate seismic activity area with relatively good seismic monitoring capability. For the Cangwu M_S 5.4 Earthquake has broken the calmness of the southeast coastal earthquake belt for 17 years, it is of great significance to study the seismic activity of the earthquake. Based on the seismic geological and seismic activity data of Guangxi and adjacent areas, this paper systematically analyzed the characteristics of the earthquake sequence and seismograph anomalies before the earthquake. The results shows that: the Cangwu M_S 5.4 Earthquake sequence belongs to isolated earthquake sequence, there had been such medium-term anomalies assmall earthquakes increasement, small earthquakes group activity, "Pingguo seismic window" opening window and seismic parameters time scanning 3 years before the earthquake in Guangxi and its adjacent area, but the short imminent anomalies is not obvious.
引文
[1]周军学,聂高众,谭劲先,等.2016年7月31日广西苍梧5.4级地震灾害特征分析[J].地震地质,2017,39(4):780-792.
[2]郭培兰.广西中等地震前地震活动性增强特征分析[J].华南地震,2011,31(1):29-36.
[3]吴时平,郭培兰.运用地震活动时间扫描分析方法的综合预测信度预测地震时间的研究[J].华南地震,2005,25(2):1-12.
[4]郭培兰.广西及邻区中等地震前地震活动参数时间扫描异常特征[J].地震地磁观测与研究,2006,27(1):1-7.
[5]Mogi K.Some Features of Recent Seismic Activity in and near Japan[J].Bulletin of the Earthquake Research Institute University of Tokyo,1969,46.
[6]中国地震局监测预报司.中国大陆地震序列研究[M].地震出版社,2007.
[7]广西壮族自治区地质局.贺县幅地质图[M].北京:地质出版社,1965.
[8]莫敬业,游象照,兰建才,等.广西通志-地震志[M].广西人民出版社,1990.
[9]焦远碧,刘特培.中等地震对华南中强地震的指示意义[J].地震地磁观测与研究,2004,25(3):42-47.
[10]易桂喜,韩渭宾.四川及邻区强震前地震活动频度的变化特征[J].地震研究,2004,27(1):8-13.
[11]赵小艳,付虹.2013年洱源MS5.5和MS5.0地震发震构造识别[J].地震学报,2014,36(4):640-650.
[12]聂晓红,高朝军,史新娣.新疆尼勒克、巩留交界MS6.0地震前部分地震学异常及序列特征[J].内陆地震,2012,26(3):193-202.
[13]张琳琳,敖雪明,聂晓红.2017年精河6.6级、库车5.7级地震前“库米什地震窗”异常特征[J].中国地震,2017,33(4):721-727.
[14]洪德全,王行舟,程鑫,等.安徽霍山窗重复地震尾波Qc值变化研究[J].地球物理学报,2013,56(10):3 416-3424.
[15]易桂喜,龙锋,张致伟,等.长宁窗地震与四川及邻区M≥5.5地震的对应关系[J].地震研究,2013,36(4):427-432.
[16]Mogi K.Some discussions on aftershocks,foreshocks,and earthquakeswarms:The fracture of a semi-infinite body caused by aninner stress origin and its relation to the earthquake phenomena[J].Bull.Earthquake Res.Inst.Tokyo Unit,1963,41:615-658.
[17]Hill D P.A model for earthquake swarms[J].J.Geophys.Res.1977,82:1347-1352.
[18]Toda S,Stein R S,Sagiya T.Evidence from the AD 2000Izu islands earthquakeswarm that stressing rate governs seismicity[J].Nature,2002,419(6902):58-61..
[19]姜秀娥,陈非比.区域震群与唐山大震[J].地震学报,1983,5(2):146-156.
[20]李兴才,冯树文.震群活动的一种可能触发机制[J].地震学报,1983,5(3):297-303.
[21]陆远忠,宋俊高,戴维乐.一个判断震情的指标——震群的U值[J].地震学报,1984,6(增刊):495-508.
[22]任雪梅,盛菊琴,蔡新华.宁夏及邻区震群的前兆性分析[J].中国地震,2016,32(4):738-746.
[2]郭培兰.广西中等地震前地震活动性增强特征分析[J].华南地震,2011,31(1):29-36.
[3]吴时平,郭培兰.运用地震活动时间扫描分析方法的综合预测信度预测地震时间的研究[J].华南地震,2005,25(2):1-12.
[4]郭培兰.广西及邻区中等地震前地震活动参数时间扫描异常特征[J].地震地磁观测与研究,2006,27(1):1-7.
[5]Mogi K.Some Features of Recent Seismic Activity in and near Japan[J].Bulletin of the Earthquake Research Institute University of Tokyo,1969,46.
[6]中国地震局监测预报司.中国大陆地震序列研究[M].地震出版社,2007.
[7]广西壮族自治区地质局.贺县幅地质图[M].北京:地质出版社,1965.
[8]莫敬业,游象照,兰建才,等.广西通志-地震志[M].广西人民出版社,1990.
[9]焦远碧,刘特培.中等地震对华南中强地震的指示意义[J].地震地磁观测与研究,2004,25(3):42-47.
[10]易桂喜,韩渭宾.四川及邻区强震前地震活动频度的变化特征[J].地震研究,2004,27(1):8-13.
[11]赵小艳,付虹.2013年洱源MS5.5和MS5.0地震发震构造识别[J].地震学报,2014,36(4):640-650.
[12]聂晓红,高朝军,史新娣.新疆尼勒克、巩留交界MS6.0地震前部分地震学异常及序列特征[J].内陆地震,2012,26(3):193-202.
[13]张琳琳,敖雪明,聂晓红.2017年精河6.6级、库车5.7级地震前“库米什地震窗”异常特征[J].中国地震,2017,33(4):721-727.
[14]洪德全,王行舟,程鑫,等.安徽霍山窗重复地震尾波Qc值变化研究[J].地球物理学报,2013,56(10):3 416-3424.
[15]易桂喜,龙锋,张致伟,等.长宁窗地震与四川及邻区M≥5.5地震的对应关系[J].地震研究,2013,36(4):427-432.
[16]Mogi K.Some discussions on aftershocks,foreshocks,and earthquakeswarms:The fracture of a semi-infinite body caused by aninner stress origin and its relation to the earthquake phenomena[J].Bull.Earthquake Res.Inst.Tokyo Unit,1963,41:615-658.
[17]Hill D P.A model for earthquake swarms[J].J.Geophys.Res.1977,82:1347-1352.
[18]Toda S,Stein R S,Sagiya T.Evidence from the AD 2000Izu islands earthquakeswarm that stressing rate governs seismicity[J].Nature,2002,419(6902):58-61..
[19]姜秀娥,陈非比.区域震群与唐山大震[J].地震学报,1983,5(2):146-156.
[20]李兴才,冯树文.震群活动的一种可能触发机制[J].地震学报,1983,5(3):297-303.
[21]陆远忠,宋俊高,戴维乐.一个判断震情的指标——震群的U值[J].地震学报,1984,6(增刊):495-508.
[22]任雪梅,盛菊琴,蔡新华.宁夏及邻区震群的前兆性分析[J].中国地震,2016,32(4):738-746.