印度Ms6.8地震区域重力场变化特征研究  

GRAVITY VARIATION DETECTED BY GRACE IN INDIAN Ms6.8 EARTHQUAKE REGION

作　　者：徐海军[1] 张永志[1] 段虎荣[2,3] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西安科技大学测绘与科学技术学院,西安710054 [3]陕西铁路职业技术学院测绘工程系,渭南714000

出　　处：《大地测量与地球动力学》2012年第1期10-12,16,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金面上项目(40674001);中央高校基本科研业务费专项(CHD2010ZY016);长安大学基础研究支持计划专项基金;陕西省科学基础研究计划项目(2011JM5005)

摘　　要：利用GRACE卫星测量数据,以3个月时间尺度计算了2011-07—09月印度地震区域的重力场变化,并将计算结果与2009年和2010年同一时间尺度的变化结果进行比较,结果显示,2009年研究区域的重力值变化为正,其中新德里、博帕尔、锡金邦地区重力变化均超过了4×10-8ms-2,表明此段时期内地壳应力处于积累状态,2010年同期重力变化较小,2011年地震区域重力变化较大,震中重力值较2009年变化了约6×10-8ms-2。强震就发生在重力变化梯度带内。The gravity variations were computed in Indian earthquake region （76° -96°E, 16° -36°N） with GRACE data observed from July to September in 2009,2010 and 2011 respectively taking the GRACE GGM03C gravity field model as a reference and then the monthly gravity variations of Indian mainland before and after the Gaussian smoothing were compared between each other. The computed result is the most reasonable when the radius of the Gaussian smoothing is 600 kin. The results show that the gravity variation of the studied area was positive in 2009. The gravity variation changed more than 4 × 10^-8 ms^-2 in New Delhi, Bhopal and Sikkim districts. In 2010, it was smaller than that in the same time ,2009. The gravity variation change at the epicenter was of almost 6 × 10^ -8 ms^-2 in 2011 than that in 2009. The strong earthquake occurred within the steep gradient zone.

关 键 词：GRACE 重力场 高斯平滑 印度地震 地壳应力 

分 类 号：P315.6[天文地球—地震学]