泾阳4.8级地震前后重力变化探析
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摘要
系统分析了泾阳MS4.8地震前后陕西关中地区流动重力观测资料,探讨了重力场的时空变化及其映震特征。结果表明:①震前在震中区附近形成较显著地重力负异常区,且与沉降区基本吻合。②泾阳地震震中区既是重力变化梯度带,也是重力异常的正值区到负值区的过度带。③由于震源区应力作用方式是以水平为主的左旋走滑运动,震前局部重力异常不显著。
The mobile gravity observation data before and after the Jingyang M_S 4.8 earthquake in GuanZhong region of Shaanxi province had been systematically analyzed,and the characteristics of variation in time and spatial domains and reflection earthquake had been studied.We have the following understanding from the results.First,there was notable gravity negative anomaly area in epicenter area before the earthquake.It was coincided with subsidence area.Second,the epicenter area was gradient area of gravity anomaly i.e.transitional area from positive to negative of gravity anomaly.Third,partial gravity anomaly before earthquake was not obvious because stress action pattern was left-slip movement of horizontal.
The mobile gravity observation data before and after the Jingyang M_S 4.8 earthquake in GuanZhong region of Shaanxi province had been systematically analyzed,and the characteristics of variation in time and spatial domains and reflection earthquake had been studied.We have the following understanding from the results.First,there was notable gravity negative anomaly area in epicenter area before the earthquake.It was coincided with subsidence area.Second,the epicenter area was gradient area of gravity anomaly i.e.transitional area from positive to negative of gravity anomaly.Third,partial gravity anomaly before earthquake was not obvious because stress action pattern was left-slip movement of horizontal.
引文
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陈章立,葛治洲等.1998.大陆地震预报的方法和理论———中国“八五”地震预报研究进展[M].地震出版社,273～278,483～488
戴王强,王庆良,冯希杰,赵小茂等.2003.用GPS资料分析渭河盆地及邻近地区地壳运动特征[J].地震,23(4):32～36
贾民育,詹洁晖.2000.中国地震重力监测体系的结构与能力[J].地震学报,22(4):360～367
梅世蓉,冯德益,张国民,朱岳清,高旭,张肇诚.1993.中国地震预报概论[M].地震出版社,96～114,131～133
王卫东.2002.泾阳4.8级地震的构造背景[J].西北地震学报,24(2):145～149
王卫东,王平.1998.泾阳4.8级地震的震源参数和震源机制[J].西北地震学报,20(6):656～658
吴富春,段锋,柯长安,张春生,董星宏.2000.1998年泾阳4.8级地震的一些特征[J].西北地震学报,22(1):53～57
张四新,张希.1997.关中地区近期地壳垂直形变特征[J].地震,17(4):404～409
祝意青,胡斌,李辉,陈兵.2003.新疆地区重力变化与伽师6.8级地震[J].大地测量与地球动力学,23(3):66～69
祝意青,胡斌,张永志.1999.永登5.8级地震前后的重力场动态图像特征研究[J].地壳形变与地震,19(1):71～77
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