基于固定位置插值累加法的重力异常等值线图分析
张展伟1，张纳莉1，杨雅慧1，张庆扬1，刘 龙2，王朝景1，刘洪良1

1.河北省地震局保定地震监测中心站，河北保定 071000;2.河北省地震局应急服务中心，石家庄 050000

固定位置插值累加法;重力异常等值线图;震中至零等值线距离

Analysis of Gravity Anomaly Contour Map Based on Fixed Location Interpolation Accumulation Method
ZHANG Zhanwei1，ZHANG Nali1，YANG Yahui1，ZHANG Qingyang1，LIU Long2，WANG Zhaojing1，LIU Hongliang1

1.Baoding Earthquake Monitoring Central Station ， Hebei Earthquake Agency ， Baoding 071000， China ;2.Emergency Service Center ， Hebei Earthquake Agency ， Shijiazhuang 050000， China

Fixed position interpolation accumulation method; Gravity anomaly contour map; Distance between the epicenter and zero contour

DOI: 10.13512/j.hndz.2023.01.07

备注

相较于重力异常等值线图绘制中常用的同点差值插值法，使用了一种新重力异常等值线图的制图方法，称之为固定位置插值累加法。分别应用模拟数据及河北省2018至2021年度相对重力实测数据，使用同点差值插值法与固定位置插值累加法绘制了重力异常等值线图，并对结果进行了对比，结果表明固定位置插值累加法在使用测点数据次数和等值线密度方面有所改进。此外，参考河北省南部2018年6月至2019年10月震例，计算得出此两种方法震中与重力异常零等值线的距离。结果表明：使用固定位置插值累加法较同点差值插值法缩短了震中与震前重力异常零等值线间的距离。
This paper uses a new mapping method of gravity anomaly contour map，which is called fixed position interpolation and accumulation method. Using the simulated data and the relative gravity measured data of Hebei Province from 2018 to 2021， the gravity anomaly contour map is drawn by using the same point difference interpolation method and fixed position interpolation accumulation method， and the results are compared. The results show that the fixed position interpolation accumulation method is improved in terms of the number of measuring point data and contour density. In addition，the distance between the epicenter and the zero contour of gravity anomaly is calculated by referring to the 10 earthquake cases in south Hebei Province from June 2018 to October 2019. The results show that the distance between the epicenter and the zero contour line of gravity anomaly before the earthquake is shortened by using the fixed position interpolation accumulation method compared with the same point difference interpolation method.
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