九寨沟震前地表重力变化向邻近空间高度的解析延拓

Upward Continuation of Earth Surface’s Gravity Changes in Height of Near Space before Jiuzhaigou Earthquake

以2017年九寨沟7.0级地震为例,使用重力场向上解析延拓算法计算邻近空间中可能与孕震相关的重力变化,以探讨未来邻近空间无人重力测量技术在地震监测应用中的观测精度需求。结果表明,地面上约为70μGal的重力变化在20 km处衰减为18μGal。

This paper uses the Jiuzhaigou M S7.0 earthquake as an example to discuss the precision of the earthquake monitoring system.The result shows that a change of 70μGal on earth surface declines to 18μGal in near space(20 km high)to earth.