岷县-漳县6.6级地震前后重力场变化  

VARIATION OF GRAVITY-FIELD BEFORE AND AFTER MINXIAN-ZHANGXIAN Ms6.6 EARTHQUAKE

作　　者：郝洪涛[1,2,3] 李辉[1,2] 张志坚 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉430071 [3]中国科学院大学,北京100039 [4]甘肃省地震局,兰州730000

出　　处：《大地测量与地球动力学》2014年第3期43-47,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震行业专项(201208009;201308009)

摘　　要：对甘肃地区2010-2013区域重力网观测资料进行精细处理,获得2013-07-22岷县-漳县6.6级地震前后的重力场变化图像。结果表明,重力场变化表现出与以往震例类似的异常特征：1）震中及以南地区震前持续正异常变化,临震前最大量级达70×10-8ms-2;2）震后重力场快速反向变化,震中区附近正异常消失。此外,资料处理过程中发现,仪器格值系数的变化对重力场变化结果存在较大的影响。The images of gravity variation before and after the Minxian-Zhangxian Ms6.6 earthquake, based on gravity data recorded by the gravity net in Gansu province show that, there are some similar characteristics with other earthquakes：l ）Before the earthquake,there was a prominent positive gravity anomaly variation amounting to 70 × 10^-8 ms^-2 in the south area of the epicenter ;2）After the earthquake, gravity variation in the same area was negative, and the positive gravity anomaly variation disappeared. In addition, we found that the calibrate factors of the instruments could affect the result of gravity variation and should be detected and corrected. Our result could provide some reference to research of mechanism of this earthquake.

关 键 词：甘肃重力网 岷县-漳县地震 重力异常变化 仪器格值 震中区 

分 类 号：P315[天文地球—地震学]