【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。更多还原

【Abstract】 Annual gravity changes in China mainland and its vicinity are calculated from GRACE data,and the characteristics of annual changes are discussed.By analyzing the gravity changes before and after several strong earthquakes,the results show that the gravity in 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.更多还原