地震地磁观测与研究2026，Vol.47Issue(3)：36-40,5.DOI:10.3969/j.issn.1003-3246.2026.03.005
2021年漾濞MS 6.4地震前临震微波动异常特征分析
Analysis of pre-seismic micro-fluctuation anomalies before the 2021 Yangbi MS 6.4 earthquake
摘要
Abstract
Based on waveform data from the Pre-seismic Micro-fluctuation Real-time Tracking System,this study selected pre-seismic micro-fluctuation events with dominant frequencies from 11 to 16 Hz and relatively complete spectral shapes.Taking an activity N value greater than or equal to 4 lasting for more than 4 days as the anomaly criterion,micro-fluctuation events recorded by seismic stations within 150 km of the epicenter of the 2021 Yangbi MS 6.4 earthquake were analyzed.The results show that the East-West(EW)component of Eryuan station,46 km from the epicenter,reached the anomaly tracking criterion on the day of the earthquake(May 21),with a maximum activity N value of 26,and returned to the background level 5 days after the earthquake(May 27).Among the 11 seismic stations,8 stations recorded pre-seismic micro-fluctuation events before the earthquake.More events were recorded on the EW component and at stations located southeast and northwest of the epicenter.关键词
临震微波动现象/漾濞MS 6.4地震/异常跟踪指标Key words
pre-seismic micro-fluctuation/Yangbi MS 6.4 earthquake/anomaly tracking indicator引用本文复制引用
余娜,王建军,张晓清,杨晓霞..2021年漾濞MS 6.4地震前临震微波动异常特征分析[J].地震地磁观测与研究,2026,47(3):36-40,5.基金项目
青海省基础研究计划(项目编号:2023-ZJ-770) （项目编号:2023-ZJ-770）
