滇西南地区品质因子、场地反应与震源参数研究

刘奥懿; 荣棉水; 李小军; 王宏伟; 卢滔; 傅磊

doi:10.11899/zzfy20220305

滇西南地区品质因子、场地反应与震源参数研究

doi: 10.11899/zzfy20220305

刘奥懿^1,,
荣棉水^2, ,,
李小军²,
王宏伟³,
卢滔¹,
傅磊⁴

1.
防灾科技学院, 河北三河 065201
2.
北京工业大学，城市与工程安全减灾教育部重点实验室, 北京 100124
3.
中国地震局工程力学研究所, 哈尔滨 150080
4.
中国地震局地球物理研究所, 北京 100081

基金项目: 国家自然科学基金项目（51878625）；国家自然科学基金（52192675）

详细信息

作者简介:
刘奥懿，女，生于1998年。硕士研究生。主要从事地震场地效应研究。E-mail：aoyi610@163.com

通讯作者:
荣棉水，男，生于1982年。博士后，副研究员，博士生导师。主要从事工程抗震设计地震动参数确定的相关理论、方法和应用研究。E-mail：waltrong@126.com

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出版历程
- 收稿日期: 2022-05-15
- 刊出日期: 2022-09-30

Study on Quality Factor, Site Effect and Source Parameter in Southwest Yunnan

1.
Institute of Disaster Prevention, Sanhe 065201, Hebei , China
2.
Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China
3.
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
4.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

摘要

摘要: 为深入了解滇西南地区地震动影响因素特征，更好地服务于目标区的抗震设防工作与地震预测等相关研究，利用两步非参数化广义反演方法对滇西南地区2007—2019年242组三分量强震记录进行分析，通过对地表观测地震动在频域内的分离求解，给出了该地区0.5～20 Hz的品质因子经验关系，获得了26个强震台站在研究频段内的场地反应，并与HVSR法揭示的场地放大结果进行对比分析。基于网格搜索法确定了35次地震事件的地震矩M₀、拐角频率f_c及震源模型参数$ \gamma $，拟合得到了部分震源参数之间的定标关系。研究结果表明，滇西南地区品质因子Q值与频率的关系为Q=94.23f ^0.43；相较于HVSR法，非参数化广义反演方法确定的场地反应整体偏高，但2种方法得到的场地反应谱形较一致；拐角频率、地震矩及应力降等震源参数互相具有一定依赖性。
- 滇西南地区 /
- 非参数广义反演 /
- 品质因子 /
- 场地反应 /
- 震源参数
Abstract: In order to deeply understand the characteristics of influence factors of ground motion in Southwest Yunnan, and better serve the related research of seismic fortification and earthquake prediction in the target area, 242 groups of three-component strong earthquake recordings in Southwest Yunnan from 2007 to 2019 were analyzed by using the two-step non-parametric generalized inversion method. By separating and solving the ground motions observed on the surface in frequency domain, the empirical relationship of the quality factors of 0.5 ~ 20 Hz in this area was given, and the site effect of 26 strong earthquake stations in the study frequency band were obtained, which were compared with the HVSR results. Based on the grid search method, the seismic moment M₀, corner frequency f_c and source model parameters of 35 seismic events are determined, and the calibration relationship among some source parameters is obtained by fitting. The results show that the relationship between Q value and frequency of quality factor in Southwest Yunnan is Q=94.23f ^0.43. Compared with HVSR method, the site response determined by non-parametric generalized inversion method is generally higher, but the site effect spectra obtained by the two methods are consistent. The source parameters such as corner frequency, seismic moment and stress drop are mutually dependent.
- Southwest Yunnan /
- Non-parametric Generalized Inversion /
- Q value /
- Site effect /
- Source parameters

HTML全文

图 1 研究区范围与数据情况

Figure 1. The research area and selected earthquakes and stations

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图 2 初始数据库中M_S与震源距分布情况

Figure 2. Distribution of M_S versus hypocentral distance

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图 3 信噪比≥3的记录数量百分比

Figure 3. Percentage of records with SNR≥3

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图 4 景谷台HVSR谱比计算结果

Figure 4. HVSR results at the 53JGX

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图 5 2种方法确定的场地反应结果对比

Figure 5. Site effect results by using GIT and HVSR method

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图 6 品质因子Q拟合结果

Figure 6. Fitting results of quality factor

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图 7 位移震源谱拟合结果

Figure 7. Fitting results of partial displacement source spectrum

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图 8 震源参数间的分布关系及拟合结果

Figure 8. Distribution and fitting results of some source parameters

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