2008年河南封丘4级震群前后重力场时空演化特征
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摘要
河南封丘4级震群尤其是ML4.8地震前后重力场的变化和动态演化特征的研究表明:震前冀鲁豫测区的重力场出现上升→下降→上升变化可能是较明显的中短期前兆异常反映;封丘地震发生在重力加速变化过程中。重力场动态图像较清晰地反映了孕震区准均匀态→非均匀态→发震的演化过程。震后该区的重力异常没有恢复。还介绍了根据重力异常对封丘地震预测的过程。
The variation features of gravity field and seismicity before and after the Fengqiu earthquake swarm are discussed based on the data of gravity monitoring network in border region of Hebei-Henan-Shandong provinces.The results show that the ascent→descent→ascent variations of the gravity field before the earthquake are the obvious reflection of medium-short-term anomalies in the gravity field,and the earthquake occurred during changing stage of acceleration.The dynamic images reflect clearly the evolutionary process of the gravity field in the seismogenic zone,i.e.quasi-homogeneous state→inhomogeneous state→earthquake occurrence.After the earthquakes,the gravity anomalies in this region did not recover.The prediction of Fengqiu earthquake according to the gravity anomalies is presented in the paper also.
The variation features of gravity field and seismicity before and after the Fengqiu earthquake swarm are discussed based on the data of gravity monitoring network in border region of Hebei-Henan-Shandong provinces.The results show that the ascent→descent→ascent variations of the gravity field before the earthquake are the obvious reflection of medium-short-term anomalies in the gravity field,and the earthquake occurred during changing stage of acceleration.The dynamic images reflect clearly the evolutionary process of the gravity field in the seismogenic zone,i.e.quasi-homogeneous state→inhomogeneous state→earthquake occurrence.After the earthquakes,the gravity anomalies in this region did not recover.The prediction of Fengqiu earthquake according to the gravity anomalies is presented in the paper also.
引文
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[8]李清林,秦建增,冯建林.河南原阳2002年11月7日ML4.5地震前后的重力场变化[A]∥地震研究与工程抗震[G].北京:原子能出版社,2003:111-115.
[9]李清林,秦建增.大同5.6级地震前后的重力场变化和深部动力学过程[J].地壳形变与地震,2001,19(4):43-51.
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[11]苏树朋,张跃刚.河北省文霸网流动重力观测对网区及周边地震的反应[J].西北地震学报,2009,31(1):91-96.
[12]刘代芹,王晓强,李杰,等.新疆南天山地区重力场动态演化特征[J].西北地震学报,2009,31(2):174-178.
[13]梁伟锋,祝意青,刘练,等.民乐6.1级地震前后的重力变化[J].大地测量与地球动力学,2006,26(3):59-64.
[14]胡斌,祝意青,田勤俭,等.关中地区重力场及其时空动态演化特征[J].中国地震,2006,22(2):172-181.
①中国地震局地球物理勘探中心.2009年度地震趋势研究报告.2008.
②中国地震局地球物理勘探中心.2008年度地震趋势研究报告.2007.
[2]赵金仁,张先康,张成科,等.河南林县地震区地壳深部构造背景探讨[J].中国地震,1999,15(3):229-236.
[3]嘉世旭,张先康,方盛明.华北裂陷盆地不同块体地壳结构及演化研究[J].地学前缘,2001,8(2):259-266.
[4]国家地震局,地震重复重力测量规范[S].北京:地震出版社,1983.
[5]张国民,傅征祥,桂燮泰,等.地震预报引论[M].北京:科学出版社,2001.
[6]秦建增,李清林,郭德科,等,河南范县ML4.3地震前后的重力场与预测过程[J].西北地震学报,2007,29(4):380--384.
[7]秦建增,李清林,李德庆,等.流动重力结果与河南范县ML4.7地震[J].华北地震科学,2008,26(1):17-21.
[8]李清林,秦建增,冯建林.河南原阳2002年11月7日ML4.5地震前后的重力场变化[A]∥地震研究与工程抗震[G].北京:原子能出版社,2003:111-115.
[9]李清林,秦建增.大同5.6级地震前后的重力场变化和深部动力学过程[J].地壳形变与地震,2001,19(4):43-51.
[10]孟夏,孟万辉,徐敬文,等.流动重力测量结果与地震的关系[J].西北地震学报,2001,23(3):74-77.
[11]苏树朋,张跃刚.河北省文霸网流动重力观测对网区及周边地震的反应[J].西北地震学报,2009,31(1):91-96.
[12]刘代芹,王晓强,李杰,等.新疆南天山地区重力场动态演化特征[J].西北地震学报,2009,31(2):174-178.
[13]梁伟锋,祝意青,刘练,等.民乐6.1级地震前后的重力变化[J].大地测量与地球动力学,2006,26(3):59-64.
[14]胡斌,祝意青,田勤俭,等.关中地区重力场及其时空动态演化特征[J].中国地震,2006,22(2):172-181.
①中国地震局地球物理勘探中心.2009年度地震趋势研究报告.2008.
②中国地震局地球物理勘探中心.2008年度地震趋势研究报告.2007.
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