2012年5月28日河北省唐山4.8级地震
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摘要
2012年5月28日河北省唐山市古冶区与滦县交界发生4.8级地震,地震宏观震中位于古冶区的王辇庄乡。震中烈度为Ⅴ度,地震发生在NE走向的唐山断裂带附近。地震没有造成人员伤亡和经济损失。震源机制解P轴方位为SEE,T轴方位为SSW,接近水平,这与华北构造应力场的NE-NEE方向不一致。唐山4.8级地震是1976年唐山7.8级地震晚期余震的正常起伏,2004年以来唐山老震区的ML4.0以上地震呈现了很好的准周期性。唐山4.8级地震前地震活动性和测震学参数存在背景性异常,从不同角度反映了老震区地震活动平静、起伏的阶段性特征。前兆异常以中短期异常为主,其中地下流体异常、电磁异常表现更为突出。此次地震虽然震级不高,但无论是地震活动性还是前兆方面都出现了一定数量的异常。异常既有趋势性的,也有短临的,配套性很好。
An M4.8 earthquake occurred in the joint area of Guye and Luanxian of Tangshan city on May 28,2012.The macroscopic epicenter was located in Wangnianzhuang in Guye region.The Intensity of epicenter was Ⅴ degree.The earthquake occurred in the middle of Tangshan Fault in the northeast direction.The earthquake caused no human casualties and economic losses.In the focal mechanism solution,the azimuth of P axis was SEE and T axis was SSW near horizontal.It was not uniform with the tectonic stress field in North China,which is in NE-NEE direction.The M4.8 earthquake was undulation of the aftershocks of Tangshan M7.8 earthquake occurred in 1976.The over ML4.0 earthquakes in Tangshan area showed a quasi-periodic characteristic.There were some background anomalies both in seismicity and seismometry before the event,and they reflected the quiet and undulant process of the seismic activity in the old earthquake region from different views.The precursory anomalies were mainly middle and short term ones,in which groundwater and electromagnetic anomalies were obvious.The magnitude of the earthquake was not high,but it showed many anomalies,both in seismicity or precursor.The anomalies matched very well,in which there were both tendency and current ones.
An M4.8 earthquake occurred in the joint area of Guye and Luanxian of Tangshan city on May 28,2012.The macroscopic epicenter was located in Wangnianzhuang in Guye region.The Intensity of epicenter was Ⅴ degree.The earthquake occurred in the middle of Tangshan Fault in the northeast direction.The earthquake caused no human casualties and economic losses.In the focal mechanism solution,the azimuth of P axis was SEE and T axis was SSW near horizontal.It was not uniform with the tectonic stress field in North China,which is in NE-NEE direction.The M4.8 earthquake was undulation of the aftershocks of Tangshan M7.8 earthquake occurred in 1976.The over ML4.0 earthquakes in Tangshan area showed a quasi-periodic characteristic.There were some background anomalies both in seismicity and seismometry before the event,and they reflected the quiet and undulant process of the seismic activity in the old earthquake region from different views.The precursory anomalies were mainly middle and short term ones,in which groundwater and electromagnetic anomalies were obvious.The magnitude of the earthquake was not high,but it showed many anomalies,both in seismicity or precursor.The anomalies matched very well,in which there were both tendency and current ones.
引文
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刘蒲雄、吕晓健,2011,唐山地震序列空间分布复杂性原因研究,地震,31(4),1～14。
曲均浩、蒋海昆,2012,余震活动机理研究综述,中国地震,28(2),109～120。
乔子云、张跃刚、丁瑞同等,2012,河北省数字电磁扰动应用研究,地震地磁观测与研究,33(2),67～73。
许忠淮、汪素云、1994,我国部分早期震源机制解答的重新测定,地震地磁观测与研究,15(5),1～9。
尤惠川、徐锡伟、吴建平等,2002,唐山地震深浅构造关系研究,地震地质,24(4),571～582。
张肇诚、罗咏生、郑大林等,1990,1976年7月28日河北省唐山7.8级地震,中国震例(1976～1980),59～103。
张宏志、刁桂苓、陈祺福等,2008,1976年唐山7.8级地震震区现今地震震源机制分析,地震研究,31(1),1～6。
仲秋、史保平,2012,1976年唐山MS7.8地震余震序列持续时间及对地震危险性分析的意义,地震学报,34(4),494～508。
刘保金、曲国胜、孙铭心等,2011,唐山地震区地壳结构和构造:深地震反射剖面结果,地震地质,33(4),901～912.
刘蒲雄、吕晓健,2011,唐山地震序列空间分布复杂性原因研究,地震,31(4),1～14。
曲均浩、蒋海昆,2012,余震活动机理研究综述,中国地震,28(2),109～120。
乔子云、张跃刚、丁瑞同等,2012,河北省数字电磁扰动应用研究,地震地磁观测与研究,33(2),67～73。
许忠淮、汪素云、1994,我国部分早期震源机制解答的重新测定,地震地磁观测与研究,15(5),1～9。
尤惠川、徐锡伟、吴建平等,2002,唐山地震深浅构造关系研究,地震地质,24(4),571～582。
张肇诚、罗咏生、郑大林等,1990,1976年7月28日河北省唐山7.8级地震,中国震例(1976～1980),59～103。
张宏志、刁桂苓、陈祺福等,2008,1976年唐山7.8级地震震区现今地震震源机制分析,地震研究,31(1),1～6。
仲秋、史保平,2012,1976年唐山MS7.8地震余震序列持续时间及对地震危险性分析的意义,地震学报,34(4),494～508。
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