[1](赵庆旭,王延伟,刘 娟,等.最大卓越周期估算震级方法的优化研究[J].世界地震工程,2023,39(02):200-212.[doi:10.19994/j.cnki.WEE.2023.0043 ]
　(ZHAO Qingxu,WANG Yanwei,LIU Juan,et al.Study on the magnitude estimation based on the optimized maximum predominant period[J].,2023,39(02):200-212.[doi:10.19994/j.cnki.WEE.2023.0043 ]
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最大卓越周期估算震级方法的优化研究
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《世界地震工程》[ISSN:/CN:]

卷:
39
期数:
2023年02期
页码:
200-212
栏目:
常规论文
出版日期:
2023-05-15

文章信息/Info

Title:
Study on the magnitude estimation based on the optimized maximum predominant period
文章编号:
1007-6069(2023)02-0200-13
作者:
(赵庆旭; 王延伟; 刘 娟; 莫红艳; 曹振中)
桂林理工大学 广西岩土力学与工程重点实验室,桂林 541004
Author(s):
(ZHAO Qingxu;  WANG Yanwei;  LIU Juan;  MO Hongyan;  CAO Zhenzhong)
Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China
关键词:
地震预警;  震级估算;  最大卓越周期;  KiK-net
Keywords:
earthquake early warning;  magnitude estimation;  maximum predominant period;  KiK-net
分类号:
P315.9
DOI:
10.19994/j.cnki.WEE.2023.0043
文献标志码:
A
摘要:
震级估算是地震预警系统(EEWs)的核心任务。基于最大卓越周期参数(pmax)的震级估算方法被广泛研究和应用,但pmax计算细节被忽视,导致pmax的震级估算效果存在较大的差异。为此,利用日本的大量井下强震记录,对pmax计算涉及的滤波范围、滤波阶数和平滑系数的设置进行优化,提出了pmax的优化计算方法,即滤波范围选用高通0.001 Hz,滤波阶数为1阶,平滑系数取0.95。利用日本和智利的初至3～6 s P波对比分析优化后的pmax和优化前的pmax以及c的震级估算效果,结果表明:优化后的pmax与震级的相关性和震级估算的误差均好于优化前的pmax和c。本文给出的pmax优化计算方法,可以显著地改善pmax在EEWs中的震级估算效果。
Abstract:
Magnitude estimation is a key task of earthquake early warning systems(EEWs). The magnitude estimation method based on the maximum predominant period parameter(pmax)has been widely studied and applied, but the details of pmax calculation have been ignored, resulting in large differences in magnitude estimation. Therefore, a large number of strong downhole ground motion records from Japan are used to optimise the settings of the filter range, filter order and smoothing coefficient involved in the pmax calculation, and the optimal calculation method for pmax is proposed. The optimal calculation is that the filter range is 0.001 Hz high pass, the filtering order is 1 and the smoothing coefficient is 0.95. The magnitude estimation performance of the optimized pmax, the pre-optimized pmax and the average period parameter(c)calculated by initial 3-6 s P waves of Japan and Chile was tested. The results show that, the correlation between the optimized pmax and magnitude and the error of the magnitude estimation of the optimized pmax are better than those of pre-optimized pmax and c. The proposed optimal calculation method of pmax can significantly improve the magnitude estimation of pmax for EEWs.

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备注/Memo

备注/Memo:
收稿日期:2022-05-05; 修回日期:2022-06-17
基金项目:国家自然科学基金项目(51968016, 51968015); 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)
作者简介:赵庆旭(1997—),男,硕士研究生,主要从事地震监测预警研究. E-mail:zhaoq_xu@qq.com

更新日期/Last Update: 1900-01-01