GRACE探测强地震重力变化  

DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE

作　　者：邹正波[1,2,3] 罗志才[1] 李辉[2,3] 申重阳[2,3] 周新[2,3] 

机构地区：[1]武汉大学测绘学院,武汉430079 [2]中国地震局地震研究所,武汉430071 [3]地壳运动与地球观测实验室,武汉430071

出　　处：《大地测量与地球动力学》2010年第2期6-9,共4页Journal of Geodesy and Geodynamics

基　　金：科技支撑项目(2008BAC354B05);国家自然科学基金(40704009)

摘　　要：利用GRACE卫星重力资料,计算中国及周缘地区重力场年变化,探讨重力场年变化特点。对几次大地震前后重力场变化特征的分析显示,大地震前震源区附近会出现大范围正变化,震后逐渐转变为负异常,汶川Ms8.0地震前后的局部重力场变化也具有相同特征。研究结果表明,大地震对局部重力场影响明显,卫星重力具有探测强地震重力变化的能力。Annual gravity changes in China mainland and its vicinity are calculated from GRACE data, and the characteristics of annual changes are discussed. earthquakes, the results show that the gravity in By analyzing the gravity changes before and after several strong the epicenter zone appears positive before the earthquake and converts to negative after the shock. The calculation of the gravity before and after the Wenchuan earthquake shows the same phenomenon. It is concluded that the regional gravity field is affected by strong earthquakes, and gravity satellites have the ability of detecting gravity changes caused by strong earthquakes.

关 键 词：GRACE卫星 重力场 重力变化 汶川地震 地震监测 

分 类 号：P315.726[天文地球—地震学]