利用小波变换研究2024-01-23乌什M_(S)7.1地震前重力异常特征  

Study on Gravity Anomaly Characteristics Using Wavelet Transform before the Wushi M_(S)7.1 Earthquake on January 23,2024

作　　者：陈丽[1,2] 刘代芹 艾力夏提·玉山[1,2,3] 阿卜杜塔伊尔·亚森 赵磊[1,2] 丁宇 李秉烨[1,2] 李瑞 CHEN Li;LIU Daiqin;AILIXIATI Yushan;ABUDUTAYIER Yasen;ZHAO Lei;DING Yu;LI Bingye;LI Rui(Earthquake Agency of Xinjiang Uygur Autonomous Region,338 Second-Kexue Street,Urumqi 830011,China;Xinjiang Pamir Intracontinental Subduction National Observation and Research Station,338 Second-Kexue Street,Urumqi 830011,China;School of Earth and Space Sciences,University of Science and Technology of China,96 Jinzhai Road,Hefei 230026,China)

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐市830011 [2]新疆帕米尔陆内俯冲国家野外科学观测研究站,乌鲁木齐市830011 [3]中国科学技术大学地球和空间科学学院,合肥市230026

出　　处：《大地测量与地球动力学》2025年第3期279-283,共5页Journal of Geodesy and Geodynamics

基　　金：新疆维吾尔自治区自然科学基金(2022D01A106,2023D01A105);新疆维吾尔自治区重点研发项目(2020B03006-2);第三次新疆综合科学考察项目(2022xjkk1305)。

摘　　要：利用南天山地区2020—2023年流动重力观测资料,获取2024-01-23乌什M_(S)7.1地震前不同时间尺度下区域重力场动态演化特征,并通过功率谱分析方法,获取各阶小波重力细节对应的近似场源深度。结果表明:1)流动重力(3 a尺度)结果显示,乌什M_(S)7.1地震前,乌恰至巴楚地区和阿克苏地区重力变化呈现明显的四象限分布,震中位于四象限边缘及零值线附近;2)2020—2023年南天山地区重力场小波变换(4阶小波重力细节)结果显示,乌什M_(S)7.1地震前,乌恰至巴楚地区重力变化出现明显的四象限分布,震中位于四象限边缘及零值线附近。The dynamic evolution characteristics of regional gravity field at different time scales before the Wushi M_(S)7.1 earthquake are obtained by using the mobile gravity observation data of southern Tianshan area from 2020 to 2023,and the approximate field source depth corresponding to each order wavelet gravity detail is obtained by power spectrum analysis method.The results show that:1)Before the Wushi M_(S)7.1 earthquake,the gravity changes in Wuqia-Bachu and Aksu areas show an obvious four-quadrant distribution,and the epicenter is located at the edge of four quadrants and near the zero line.2)The wavelet transform results of gravity field in southern Tianshan area from 2020 to 2023 show that before the Wushi M_(S)7.1 earthquake,the gravity changes in Wuqia-Bachu area shows obvious four-quadrant distribution,and the epicenter is located at the edge of four quadrants and near the zero line.

关 键 词：流动重力 小波变换 乌什地震 

分 类 号：P312[天文地球—固体地球物理学]