[1]熊成,叶秀薇,张严心.广东测震台站的场地响应以及对震级确定的影响分析[J].华南地震,2020,40(04):18-28.[doi:10.13512/j.hndz.2020.04.03]
　XIONG Cheng,YE Xiuwei,ZHANG Yanxin.Site Response of Guangdong Seismic Stations and Its Influence on Determination of Earthquake Magnitude[J].,2020,40(04):18-28.[doi:10.13512/j.hndz.2020.04.03]
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广东测震台站的场地响应以及对震级确定的影响分析()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
40
期数:
2020年04期
页码:
18-28
栏目:
地震研究
出版日期:
2020-12-30

文章信息/Info

Title:
Site Response of Guangdong Seismic Stations and Its Influence on Determination of Earthquake Magnitude
文章编号:
1001-8662（2020）04-0018-011
作者:
熊成1; 2; 3; 叶秀薇1; 2; 3; 张严心1; 2; 3
1.广东省地震局, 广州 510070;2.中国地震局地震监测与减灾技术重点实验室,广州 510070;3.广东省地震局广东省地震预警与重大工程安全诊断重点实验室,广州 510070
Author(s):
XIONG Cheng1; 1; 2; 1; 3; YE Xiuwei1; 1; 2; 1; 3; ZHANG Yanxin1; 1; 2; 1; 3
1.Guangdong Earthquake Agency,Guangzhou 510070,China;2.CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Guangdong Earthquake Agency,Guangzhou 510070,China;3.Guangdong Provincial Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects,Guangdong Earthquake Agency,Guangzhou 510070,China
关键词:
广东地震台网; H/V谱比法; 场地响应; 震级校正
Keywords:
Guangdong Digital Seismic Network; H/V spectral ratio method; Site response; Magnitude deviation
分类号:
P315.32
DOI:
10.13512/j.hndz.2020.04.03
文献标志码:
A
摘要:
认识台站场地响应对提高台网产出数据的准确性具有重要的意义。分析了广东台网72个测震台站的地脉动记录数据,利用谱比法计算得到各台站0.1~20Hz的场地响应。结果表明有32个台站场地响应曲线平缓,无明显频率放大点;有32个台站的场地响应曲线在部分频率范围表现出较高值;还有4个台站场地响应曲线表现轻微场地缩小作用和4个台站场地响应曲线呈起伏剧烈的形态。综合台基岩性分析,发现台站的基岩硬度越大、结构越致密,场地放大作用越小。进一步利用2011年1月至2019年10月广东台网记录到的852次地震事件（ML≥2）,分析了台站场地响应对单台震级的影响,结果发现大部分台站的震级偏差结果与场地响应具有一定关系,考虑场地响应的单台震级校正值能够在一定程度上减小单台震级偏差,提高单台震级的准确性。
Abstract:
Researching the site response of the stations is of great significance to improve the accuracy of the output data of the seismic network. The paper processed the microtremors noise data recorded by 72 stations of Guangdong Seismic Network,and calculated the site response of each station at 0.1-20 Hz based on horizontal-to-vertical (H/V) spectral ratio method. The results show that the site response curves of 32 stations are flat,and there were no obvious frequency amplification points. The site response curves of 32 stations showed higher values in some frequency ranges. In addition,there were 4 stations showing slight site reduction and 4 stations with sharply fluctuating response curves. Based on comprehensive lithology analysis of the platform,it is found that the greater the hardness of the bedrock and the denser the structure,the smaller the site amplification effect. This paper further uses the 852 earthquake events with ML ≥2 recorded by the Guangdong Station Network from January 2011 to October 2019 to analyze the effect of the station site response on the magnitude of a single station. As a result, the magnitude deviation of most stations has a certain relationship with the site response. The single magnitude correction value obtained from the site response can reduce the deviation between the single magnitude and the average magnitude of the network to a certain extent and improve the accuracy of the single station magnitude

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备注/Memo

备注/Memo:
收稿日期: 2020-02-10
基金项目: 国家自然基金广东联和基金项目（U1901602）；广东省科技计划项目（2018B020207011）联合资助
作者简介:熊成（1993- ）,男,助理工程师,主要从事地震监测及地壳结构成像研究。
E-mail: xiongcheng15@mails.ucas.ac.cn.
更新日期/Last Update: 2020-12-20