地震重力分析是指，通过研究时变重力场变化，进而获取地球内部介质物性变化信息。本文选取川滇地区 2013—2017 年流动重力观测资料，采用欧拉反褶积方法，对研究区重力变化场源深度及空间分布特征进行反演和解释，分析研究区重力观测网总体监测能力。以 2014 年鲁甸 MS 6.5 地震为例，通过反演计算研究区重力场差分变化，发现重合度较好地区集中在鲁甸以南垂直于昭通断裂的 NW 向条带状区域，整体场源深度集中分布在 20—40 km 范围内，与此次鲁甸地震序列主震和余震深度分布范围相对应，重力变化且集中在断裂带附近。研究结果可为进一步研究川滇地区深部孕震环境特征提供一定参考。
Seismic gravity analysis refers to the acquisition of information on the physical properties of the Earth’s internal medium by studying the changes in the time-varying gravity field. This paper selects the mobile gravity observation data of the Sichuan-Yunnan region from 2013 to 2017, and uses the Euler deconvolution method to invert and interpret the source depth and spatial distribution characteristics of the gravity change field in the study area, and to analyze the overall monitoring capability of the gravity observation network in the study area. Taking the Ludian MS 6.5 earthquake in 2014 as an example, the differential changes in the gravity field in the study area are calculated through inversion. It is found that the areas with good coincidence are concentrated in the NW-trending strip-shaped area south of Ludian, perpendicular to the Zhaotong Fault. The overall source depth is concentrated in the range of 20-40 km, which corresponds to the depth distribution range of the main shock and aftershocks of this Ludian earthquake sequence. The gravity changes are concentrated near the fault zone. The research results can provide a certain reference for further studying the deep seismogenic environment characteristics of the Sichuan Yunnan region.
