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[1]邵媛媛,郑 勇,王 亮,等.辽宁地区Lg波衰减及场地响应特征*[J].地震研究,2020,43(01):19-27.
　SHAO Yuanyuan,ZHENG Yong,WANG Liang,et al.Lg-Wave Attenuation and Site Response in the Liaoning Region[J].Journal of Seismological Research,2020,43(01):19-27.
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辽宁地区Lg波衰减及场地响应特征*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
43
期数:
2020年01期
页码:
19-27
栏目:
出版日期:
2020-01-30

文章信息/Info

Title:
Lg-Wave Attenuation and Site Response in the Liaoning Region
作者:
邵媛媛1; 郑 勇2; 3; 王 亮1; 杨士超1; 贾丽华1; 翟丽娜1
(1.辽宁省地震局,辽宁 沈阳 110034; 2.中国地质大学 地球物理与空间信息学院,湖北 武汉430074; 3.中国地质大学 地球内部多尺度成像湖北重点实验室,湖北 武汉 430074)
Author(s):
SHAO Yuanyuan1; ZHENG Yong2; 3; WANG Liang1; YANG Shichao1; JIA Lihua1; ZHAI Lina1
(1.Liaoning Earthquake Agency,Shenyang 110034,Liaoning,China)(2.Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,Hubei,China)(3.Hubei Key Laboratory of Subsurface Multi-Scale Imaging,China University of Geosciences,Wuhan 430074,Hubei,China)
关键词:
Lg波;  衰减参数;  场地响应;  联合反演:辽宁地区
Keywords:
Lg wave;  parameters of attenuation;  site response;  join inversion;  Liaoning region
分类号:
P315.72
DOI:
-
摘要:
准确的衰减特征及台站响应对于定量确定地震台网观测环境和分析其构造机制具有重要意义。选取2008—2017年辽宁数字地震台网地震波形资料,利用Lg波谱比与台站场地响应联合反演方法,获得了1～7 Hz Lg波三分向(UD,NS,EW)衰减关系,参与评估的32个台站的场地响应幅值曲线较为平滑,各频段衰减效应存在差异。大多数台站的场地效应幅值在1～8,少数台在低频或高频段上呈现放大效应,最大的幅值近16。结果表明:辽宁地区为低Q0(对应频率1 Hz)和低频率依赖性的构造活跃区,场地响应特征与浅层结构及地质构造有密切关系。不同场地类型的场地响应特征差异明显:井下场地类型的场地响应在低频段内(1～2 Hz)有明显的放大效应; 地表较山洞场地类型的场地响应幅值在径向和垂向上都有抬升; 相同场地类型中,场地响应放大效应在径向上比垂向上大的多,可能与台基岩性特征有关,而岩性差异对场地响应特征的影响不明显。
Abstract:
The accurate attenuation characteristics and station response in Liaoning area are of great significance for quantitatively determining the observation environment of the seismic network and analyzing its tectonic mechanism.Digital seismic waveform data in Liaoning Digital Seismic Network between 2008 and 2017 are used to investigate site responses by a joint inversion method based on Lg-wave spectral ratio.We obtained the attenuation properties of the three components(UD,NS,EW)at the frequency of 1～7 Hz:The Liaoning region displays low Q0 and weak frequency dependence,and is consistent with the geology of the active tectonic region.Amplitudes of site response are relatively flat within the dominant frequency band in the 32 stations of the Liaoning seismic network,while vary significantly in the high and low frequency bands.A few stations show obvious amplification effect at low frequency or high frequency band.For most stations,the site response amplitudes are within range of 1～8,with the maximum amplitude of ～16.Obvious differences can be found in different site types:at the lower frequency of 1～2 Hz,the amplitudes of underground stations are obviously higher than that on the ground stations,while the amplitudes of site response at the stations on the ground are obviously higher than those stations in caves on horizontal and vertical components.The site response curve shows obviously elevated in the radial direction than the vertical direction in the same site type,possibly be related to the lithological characteristics of the platform bedrock.However,the lithological difference has no obvious influence on site response for the sites with the same site type.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2019-08-09
基金项目:中国地震局星火计划青年项目(XH18014Y)、国家重点研发计划课题(2016YFC0600101)、川滇国家地震实验场项目(2019CSES0109,2018CSES0101,2017CESE0101)和辽宁省科学技术计划项目(2017231013)联合资助.
通讯作者:郑勇(1978-),教授,主要从事地震学研究.E-mail:zhengyong@cug.edu.cn

更新日期/Last Update: 2020-01-30