[1]高曙德,杨晓鹏,陈玉鑫,等.甘肃肃北MS5.5级地震的前震与震前异常研究[J].华南地震,2025,(03):1-5.[doi:10.13512/j.hndz.2025.03.01]
　GAO Shude,YANG Xiaopeng,CHEN Yuxin,et al.Study on the Foreshock and Preseismic Anomaly of the MS5.5 Earthquake in Subei，Gansu Province[J].,2025,(03):1-5.[doi:10.13512/j.hndz.2025.03.01]
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甘肃肃北MS5.5级地震的前震与震前异常研究()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2025年03期
页码:
1-5
栏目:
地震科学研究
出版日期:
2025-09-30

文章信息/Info

Title:
Study on the Foreshock and Preseismic Anomaly of the MS5.5 Earthquake in Subei，Gansu Province
文章编号:
1001-8662（2025）03-0001-05
作者:
高曙德1; 2; 杨晓鹏1; 陈玉鑫1; 武善艺1
1.甘肃省地震局（中国地震局兰州地震研究所），兰州 730000;2.甘肃兰州地球物理国家野外科学观测研究站，兰州 730000
Author(s):
GAO Shude1; 2; YANG Xiaopeng1; CHEN Yuxin1; WU Shanyi1
1.Gansu Earthquake Agency (Lanzhou Institute of Earthquake Research ， CEA )， Lanzhou 730000， China ;2.Lanzhou Geophysics National Observatory and Research Station ， Lanzhou 730000， China
关键词:
肃北5.5级地震; 前兆异常; 前震; 地震预测
Keywords:
Subei MS5.5 earthquake; Precursor anomaly; Foreshock; Earthquake prediction
分类号:
P315
DOI:
10.13512/j.hndz.2025.03.01
文献标志码:
A
摘要:
2023年10月24日甘肃肃北MS5.5级地震发生在NWW向中祁连北缘断裂带上，震源机制逆冲型。该次地震前祁连山中西段有5项测震学异常，其中、震前1个月新增祁连地震带西段MS3级地震围空异常，2023年7月嘉峪关西沟洞体应变EW分量应力变化从拉张转为受压，NS分量出现了年变幅减小，114天后距离测点54km发生甘肃肃北5.5级地震。主震前两天内，在东南方向地震活动明显增强，共记录到26次地震事件，最大为2023年10月22日肃北MS4.7级，在主震前7h左右进入平静期、之后主震发生。总结肃北5.5级地震前各测项的异常变化特征，以及确定前震序列对判断主震发生积累了经验，对地震预测研究增加了新的震例。
Abstract:
On October 24， 2023， the MS5.5 earthquake in Subei， Gansu Province occurred on the NWW-trending fault zone at the northern edge of the Qilian Mountains， with a thrust type focal mechanism. Before the earthquake， there were 5 seismic anomalies in the central and western sections of the Qilian Mountains. Among them， there was a new MS3 earthquake anomaly in the western section of the Qilian earthquake zone one month before the earthquake. In July 2023， the strain EW component of the Xigou Cave in Jiayuguan changed from tension to compression， and the NS component showed a decrease in annual amplitude. 114 days later， 54 km away from the measuring point，a MS5.5 earthquake occurred in Subei，Gansu Province. In the two days before the main earthquake，there was a significant increase in seismic activity in the southeast direction，with a total of 26 recorded earthquake events， the largest of which was Subei MS4.7 earthquake on October 22， 2023. It entered a calm period about 7 hours before the main shock and then the main shock occurred. This paper summarizes the abnormal changes in various measurement items before Subei MS5.5 earthquake， as well as the experience accumulated in determining the occurrence of the main earthquake by determining the foreshock sequence， and adds new earthquake examples to earthquake prediction research.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期：2024-05-10基金项目：甘肃省科技计划项目(25YFFA076，23JRRA1397，22JR5RA315)；甘肃省教育科技创新产业支撑计划项目（2021CYZC-67）联合资助。
作者简介：高曙德（1970-），男，正高级工程师，主要从事地震监测预报和科学研究工作。E-mail：gsd_gsd@126.com
更新日期/Last Update: 2025-09-30