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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

期数:

2025年04期

页码:

631-640

栏目:

重力场及其变化观测与地球科学应用专辑

出版日期:

2025-05-01

文章信息/Info

Title:

Reconstruction of Relative Gravity Data and Inversion of Apparent Density: A Case Study of the 2021 Yangbi M_S6.4 Earthquake

作者:

徐声鑫; 黄江培; 郑秋月; 曹颖; 吴宇琴

(云南省地震局,云南 昆明 650024)

Author(s):

XU Shengxin; HUANG Jiangpei; ZHENG Qiuyue; CAO Ying; WU Yuqin

(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

关键词:

时空平滑;  数据重构;  视密度;  六面体;  辨识度;  漾濞6.4级地震

Keywords:

spatio-temporal smoothing;  data reconstruction;  apparent density;  Hexahedron;  identifiability;  the Yangbi M_S6.4 earthquake

分类号:

P315.726

DOI:

10.20015/j.cnki.ISSN1000-0666.2025.0064

摘要:

针对相对重力观测过程中可能受到环境等因素影响而出现高频信号和局部异常的情况,以2021年漾濞6.4级地震前重力变化为例,通过时空平滑约束重构重力变化数据,对比重构前后重力变化情况。基于球坐标系下六面体模型模拟场源体介质,反演场源视密度变化,分析场源区介质密度演化特征。结果显示:观测数据经过时空平滑重构后,在不改变总体变化趋势的情况下,标准差由17.86×10^-8 m/s²降到8.99×10^-8 m/s²,变化值区间从(-74.20～66.28)×10^-8 m/s²降到(-21.79～27.70)×10^-8 m/s²,数据离散程度得到有效压缩,并能压制高频信号和局部噪声,孕震区域内重力变化时空演化趋势更加连续,便于异常特征的识别。场源区视密度变化显示有一个明显的NW-SE向物质迁移过程,在经过震中位置后逐渐收缩,在震中位置形成一个“孤岛”形态。孕震过程中正负变化分界线从SW-NE向转为NW-SE向,在分界线与构造走向一致后随即发震。

Abstract:

In response to the possibility of high-frequency signals and local anomalies caused by environmental factors during relative gravity observation,spatio-temporal smoothing constraints are introduced to reconstruct the data change,and then the gravity changes before and after reconstruction is compared.Further,the field source medium is simulated based on a hexahedral model in spherical coordinates,and the apparent density changes of the field source is inverted,to analyze the evolution characteristics of the medium density in the field source area.The results show that after spatio-temporal smoothing reconstruction,the standard deviation of the observed data decreased from 17.86×10^-8 m/s² to 8.99×10^-8 m/s² without changing the overall trend.The range of variation values decreased from(-74.20-66.28)×10^-8 m/s² to(-21.79-27.70)×10^-8 m/s²; this effectively compressed the degree of data dispersion and suppressed high-frequency signals and noise in some areas.Thus,the relative gravity spatio-temporal evolution trend in the seismogenic region became more continuous,which facilitated the identification of abnormal features.The change in apparent density in the source area reveals an obvious NW-SE migration process of the underground material.The material gradually contracted after passing through the epicentral area,forming an “island” at the epicenter.During the seismogenic process,the boundary between positive variation and negative variation shifted from SW-NE to NW-SE direction,and earthquakes occurred immediately after the boundary became in line with the structural direction.

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备注/Memo

备注/Memo:

收稿日期:2024-07-29.
基金项目:云南省地震局地震科技专项(2024ZX03,2024ZX04); 中国地震局震情跟踪定向工作任务(2024010202).
第一作者简介:徐声鑫(1985-),工程师,主要从事流动地球物理场野外数据采集相关工作.E-mail:408705228@qq.com.
通信作者简介:黄江培(1984-),高级工程师,主要从事利用重力数据采集及资料分析应用工作.E-mail:164909307@qq.com.

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更新日期/Last Update: 2025-05-01