地震地磁观测与研究2025，Vol.46Issue(5)：45-50,6.DOI:10.3969/j.issn.1003-3246.2025.05.006
2023年积石山MS6.2地震地球物理异常时空演化特征
The spatio-temporal evolution characteristics of geophysical anomalies of Jishishan MS 6.2 earthquake
摘要
Abstract
Taking the epicenter of the Jishishan MS 6.2 earthquake occurred on December 18,2023 as the center,we sortedout the geophysical anomalies at different epicentral distances,and analyzedtheir evolution characteristics.Research shows that a total of 24 precursory anomalies were identified beforetheearthquake,distributed within therange of 101 to 350 kilometers from the epicenter.The geophysical anomalies of Jishishan earthquake exhibited three stages of evolution characteristics:α stage(991 to 200 days before the earthquake),where the anomalies were manifested as a contraction from the remote source area towards the epicenter;β stage(170 days before the earthquake),where the anomalies were scattered around the epicenter;and the γ stage(75 to 3 days before the earthquake),where the anomalies were manifested as a diffusion from the epicenter outward.Through comparative analysis with other earthquake cases,it is initially found that there are significant differences in the evolution characteristics of geophysical anomalies before strong earthquakes in different blocks in the central and northern parts of the Qinghai-Xizang Plateau.In future earthquake prediction work,particular attention should be paid to the evolution process of geophysical anomalies before strong earthquakes,especially the spatio-temporal characteristics in the short-term stage.关键词
积石山MS6.2地震/地球物理异常/演化特征/三阶段Key words
Jishishan MS 6.2 earthquake/geophysicalanomalies/evolutionary characteristics/threestages引用本文复制引用
孙玺皓,张丽峰,胡维云,郭瑛霞..2023年积石山MS6.2地震地球物理异常时空演化特征[J].地震地磁观测与研究,2025,46(5):45-50,6.基金项目
青海格尔木青藏高原内部地球动力学野外科学观测研究站项目(项目编号:2024-01) （项目编号:2024-01）
