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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

期数:

2025年04期

页码:

612-622

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:

Analysis of the Temporal and Spatial Trends of the Time-varying Gravity Field Prior to Strong Earthquakes on the North-South Seismic Belt

作者:

于飞; 吴桂桔; 郝洪涛

(中国地震局地震研究所 地震大地测量重点实验室,湖北 武汉 430071)

Author(s):

YU Fei; WU Guiju; HAO Hongtao

(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China EarthquakeAdministration,Wuhan 430071,Hubei,China)

关键词:

南北地震带;  时变重力场;  二维水平梯度;  中强震

Keywords:

the North-South Seismic Belt;  time-varying gravity field;  two-dimensional horizontal gradient;  moderate- and strong-earthquakes

分类号:

P315.726

DOI:

10.20015/j.cnki.ISSN1000-0666.2025.0062

摘要:

南北地震带是中国强震频发区之一,分析该区域重力场时空变化趋势对理解强震机理、构造变形具有重要意义。引入二维水平梯度分析方法,基于2016年9月—2021年9月所获取的5期时变重力数据,计算南北地震带时变水平梯度值,结合研究区地震信息和地质构造资料,分析2017年以来研究区M_S≥5.0震中区域地震震前时变水平梯度与地震活动的时空分布特征。结果表明:研究区M_S≥5.3地震震中区域震前时变水平梯度特征与震级呈正相关; M_S≥6.0地震震中区域震前时变水平梯度高值带逐渐沿块体边界、大型断裂展布,极大值大于1.7 μGal/km,区域标准差大于0.4 μGal/km。

Abstract:

The North-South Seismic Belt is one of the regions where strong earthquakes occur frequently in China.Analyzing the temporal and spatial variation trend of the gravitational field on this belt is of great significance for understanding the mechanism of strong earthquakes and the tectonic deformation.In this paper,a two-dimensional horizontal gradient analysis method is introduced.Based on five periods of time-varying gravity data obtained from September 2016 to September 2021,the time-varying horizontal gradient values of the North-South Seismic Belt are calculated.Based on the records of the historical earthquakes(M_S≥5.0)and the geological structure in the study area,the temporal and spatial distribution characteristics of the pre-earthquake time-varying horizontal gradient and the historical earthquakes(M_S≥5.0)in the study area since 2017 are analyzed.The results indicate that the time-varying horizontal gradient before the M_S≥5.3 earthquakes is positively correlated with the magnitude of these earthquakes.Before the M_S≥6.0 earthquakes,the high-value zone of the time-varying horizontal gradient gradually extends along the block boundaries and the large faults.In addition,the maximum value can be greater than 1.7 μGal/km,and the regional standard deviation can be greater than 0.4 μGal/km.

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备注/Memo

备注/Memo:

收稿日期:2024-08-13.
基金项目:国家自然基金面上项目(42074172).
第一作者简介:于 飞(1999-),硕士研究生在读,主要从事重力数据解释研究.E-mail:13731310544@163.com.
通信作者简介:吴桂桔(1983-),研究员,主要从事重力探测和重力数据解释、强震危险性等研究工作.E-mail:wugjsky@126.com.

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更新日期/Last Update: 2025-05-01