云南地震流动重力监测网建设与映震能力分析

Construction and Analysis of Seismic Response Capability of Gravimetric Network in Yunnan

总结云南地区流动重力测网建设,根据分形几何原理,计算云南及周边地区现行测网的空间格网距和空间分辨率,给出最佳格网距为69 km,空间分辨率为61 km。结合近年云南及周边地区流动重力观测成果,绘制重力场变化图像,分析2014-08-03鲁甸6.5级地震、2014-10-07景谷6.6级地震以及2015年以后大理-保山一带部分5级以上地震相关重力场变化。综合分析认为,云南及周边地区流动重力监测网能识别5级以上地震相关的重力变化,但个别地区监测能力仍需加强。

This article summarizes the history of mobile gravimetry network construction in Yunnan.The grid space and spatial resolution of the gravimetry network in Yunnan and its adjacent areas are calculated according to the principle of fractal geometry.The results show that the optimum grid spacing is 69 km and spatial resolution is 61 km.According to gravity observations in recent years,we prepare a series of images of gravity field changes.The gravity changes for Ludian M6.5 earthquake on August 3,2014,Jinggu M6.6 earthquake on October 7,2014,and some earthquakes with magnitude larger than 5 in Dali-Baoshan region,are analyzed.In conclusion,the gravity changes for earthquakes with magnitude greater than 5 can be identified by mobile gravimetry in Yunnan and its adjacent areas,and the network should be improved in the future.