前震或广义前震识别的频谱偏移法在2023年10月24日肃北5.5级地震预测中的应用  

APPLICATION OF THE SPECTRUM DEVIATION METHOD FOR IDENTIFYING FORE-SHOCK OR GENERALIZED FORE-SHOCKS IN PREDICTION OF SUBEI M5.5 EARTHQUAKE ON OCTOBER 24,2023

作　　者：余娜[1] 杨立明 孙玺皓 YU Na;YANG Liming;SUN Xihao(Qinghai Earthquake Agency,Xining 810005,China)

机构地区：[1]青海省地震局,青海西宁810005

出　　处：《高原地震》2023年第4期1-3,8,共4页Plateau Earthquake Research

基　　金：青海省科技成果转化专项项目(项目编号:2021-SF-151);青海省基础研究计划项目(项目编号:2023-ZJ-770)联合资助。

摘　　要：基于青海和甘肃区域数字化测震台网记录的波形数据,计算2023年10月22日甘肃酒泉市肃北4.7级地震FFT频率谱,发现具有明显变窄且向低频端偏移的特征,优势频段集中在0~1.5 Hz。肃北4.7级地震2天后在震中7 km处发生了肃北5.5级地震,此次地震进一步验证了前震或广义前震识别的频谱偏移法的有效性,是一次地震预测实践中的成功震例。Using the data of 25 digital seismic stations in Gansu and Qinghai networks,the FFT frequency spectrum of Subei earthquake with 4.7 in Gansu on October 22,2023 is calculated.It is found that the frequency bandwidth is narrow and obviously shifted to the low frequency end,and the dominant frequency band is 0~1.5 Hz.The Subei 5.5 earthquake occurred at 7 km from the epicenter,and 2 days after the Subei 4.7 magnitude earthquake.This earthquake verify the effectiveness of the spectrum deviation method for identifying fore-shock or generalized fore-shocks and provided a successful example.

关 键 词：频谱偏移法 前震或广义前震识别 

分 类 号：P315.3[天文地球—地震学]