基于预警参数的震级估算比较研究——以日本福岛近海M_(j)7.4级地震为例  

Comparative Study on Magnitude Estimation Based on Early Warning Parameters:Taking the M_(j)7.4 Earthquake off Fukushima,Japan as an Example

作　　者：张欣怡 赵庆旭 王延伟 ZHANG Xin-yi;ZHAO Qing-xu;WANG Yan-wei(Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《金陵科技学院学报》2022年第4期38-44,共7页Journal of Jinling Institute of Technology

基　　金：国家自然科学基金面上项目(51968016);广西岩土力学与工程重点实验室主任基金(桂科能19-Y-21-8)。

摘　　要：使用目前较为成熟的预警参数震级估算方法,利用日本Kiban-Kyoshin network(KiK-net)数据库井下基岩观测点的大量强震动记录,建立了预警参数与震级之间的经验公式。使用经验公式对2022年3月16日日本福岛近海M_(j)7.4级地震震级进行了研究,对比分析了不同预警参数的震级估算效果。结果表明:时频参数S_(dτ)在首个台站触发后2 s即可给出接近最终实际震级的估算结果。首个台站触发后7 s,S_(dτ)的估算结果更加接近最终实际震级。对比该次地震的震级预警参数可知,基于频域结合时域的参数可以有效提高震级估算的准确性和时效性。An empirical formula between early warning parameters and magnitude was established by using the currently mature method of magnitude estimation of early warning parameters and a large number of strong earthquake records of the bedrock observation site downhole in Kiban-Kyoshin network(KiK-net),Japan database.And the empirical formula was used to conduct a study of the M_(j)7.4 earthquake off Fukushima,Japan,on March 16,2022,and to comparatively analyze the magnitude estimation effects of different early warning parameters.The results showed that the time-frequency parameter S_(dτ)gave a magnitude estimation result close to the final actual magnitude 2 s after triggering of the first station.7 s after the trigger of the first station,the magnitude estimation of S_(dτ)was closer to the final actual magnitude.The comparative study of the magnitude early warning parameters for the earthquake showed that the parameters based on the frequency domain and the time domain could effectively improve the accuracy and timeliness of the magnitude estimation.

关 键 词：震级估算 预警参数 福岛近海地震 强震记录 

分 类 号：P315.9[天文地球—地震学] TP399[天文地球—固体地球物理学]