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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

期数:

2025年04期

页码:

674-684

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:

Abnormal Variation Characteristics and Interference Analysisof DF Band Signal in gPhone Continuous Gravity Dataat Kunming Earthquake Monitoring Centre Station

作者:

黄雅¹; 2; 韦进³; 申重阳³; 段毅¹; 2; 方伟¹

(1.云南省地震局,云南 昆明 650224; 2.中国地震科学实验场大理中心,云南 大理 671000; 3.中国地震局地震研究所,湖北 武汉 430071)

Author(s):

HUANG Ya¹; 2; WEI Jin³; SHEN Chongyang³; DUAN Yi¹; 2; FANG Wei¹

(1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Dali Center of China Earthquake Science Experiment Site,Dali 671000,Yunnan,China)(3.Institute of Seismology,China Earthquake Administration,Wuhan 430071,Hubei,China)

关键词:

DF频段;  视垂直位移;  ASSM模型;  gPhone重力仪;  台风;  地震活动

Keywords:

DF frequency;  apparent vertical displacement;  ASSM model;  gPhone gravimeter;  typhoon;  seismicity

分类号:

P315.63

DOI:

10.20015/j.cnki.ISSN1000-0666.2025.0069

摘要:

基于2015—2020年昆明地震监测中心站(以下简称“昆明站”)的gPhone连续重力观测数据,采用时频分析方法计算双频微震(DF)频段视垂直位移,利用全球地震背景噪声能量辐射模型(ASSM)正演昆明站DF频段信号,并结合台风和邻近重力站数据,对昆明站DF频段信号异常变化特征进行研究,探讨了昆明站周边地震活动与DF频段信号之间的关系。结果显示:①年变化趋势显示昆明站周边300 km范围内M_S≥5.0地震易发生在台风频繁且DF频段视垂直位移较高的月份内,月变化趋势则显示地震易发生在视垂直位移由低转高的过程中。②2020年巧家M_S5.0地震前DF频段信号的异常变化,并不是由巧家地震引起,而与印度洋台风有关。总结震前DF频段信号异常特征,有助于该地区中强地震预测研究。

Abstract:

Based on gPhone continuous gravity data collected from Kunming Earthquake Monitoring Centre Station during 2015-2020,we adopted the time-frequency analysis method to calculate the apparent vertical displacement in the DF frequency band.We used the global seismic background noise energy radiation model(ASSM)to forward the DF frequency band signal at Kunming station.Referring to the data of the typhoon in the Indian Ocean,and the gravity data from the adjacent stations of Kunming station,we studied the abnormal characteristics of the DF frequency band signal at Kunming station,and explored the relationship between the earthquake activity around Kunming station and the DF frequency band signal.The results reveal that:①The annual variation trend indicates that M_S≥5.0 earthquakes around Kunming station within 300 km are prone to occuring in months with frequent typhoons and high apparent vertical displacement in the DF frequency band,while the monthly variation trend shows that earthquakes are prone to occuring during the process of the apparent vertical displacement changing from low to high.②The abnormal change of DF band signal before the Qiaojia M_S5.0 earthquake are not the precursor of the Qiaojia earthquake,but related to the typhoon from the Indian Ocean.It is helpful to predict moderate and strong earthquakes in the study area by summarizing the abnormal characteristics of DF band signal before the earthquake.

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备注/Memo

备注/Memo:

收稿日期:2024-08-27. 基金项目:中国地震局监测、预报、科研三结合项目(3JH-202401073); 云南省重点研发项目社会发展专项(202203AC100003); 中国地震局地震科技星火计划(XH23026C).
第一作者简介:黄 雅(1993-),硕士,主要从事连续重力资料的处理和分析.E-mail:1812496909@qq.com.
通信作者简介:韦 进(1981-),博士,副研究员,主要从事连续重力资料的处理和分析研究.E-mail:pierce212@163.co

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更新日期/Last Update: 2025-05-01