地震研究

2018年8月13日和14日云南通海县相继发生2次5.0级地震,中国数字强震动台网的41个(13日)和30个(14日)强震台站在2次地震中共捕获到213条三分向加速度记录,给出近场台站的地震动参数,绘制了震中附近区域峰值加速度等值线图,其长轴呈WS—EN方向展布。将实际观测数据与几种常用地震动衰减关系对比,发现霍俊荣和胡聿贤(1992)的衰减预测模型能更好地反映此次地震影响场。将不同震中距的5个台站反应谱对比,并与我国设计反应谱比较,拟合出不同周期谱加速度的衰减特性,总结了地震的反应谱基本特征。最后基于主震和多次余震观测记录,运用HVSR谱比法分析了3个典型台站的场地效应,并对其是否发生非线性反应作了初步判断。

A major earthquake of MS5.0 and aftershock of MS5.0 occurred successively on August 13 and 14,2018,Tonghai County,Yunnan Province.There are 41 and 30 strong motion stations which located in this region have been fully triggered in the main and aftershock.213 records of three-component acceleration were obtained by NSMONS.In this paper,we first calculate the peak accelerations of the 213 strong motion records.The basic characteristics of amplitude in this earthquake were analyzed according to the acceleration time-series curves and contour line of PGAs.Then,the attenuation relationship of PGAs with different distance was analyzed by comparing the observed data with some commonly used GMPE(ground motion prediction equations).In order to summarize the characteristics of response spectrum,we compare the acceleration response spectra of some typical stations with the designed spectrum.The HVSR method has been used to analyze site effect and judge whether nonlinear response occur of 3 typical stations with main and multiple aftershocks records.

引言
1 强震动记录
2 幅值特征
3 衰减关系
4 反应谱特征
5 场地特征与非线性识别
6 结论

图1 触发强震动台站分布图<br/>Fig.1 Distribution of strong motion stations

图1 触发强震动台站分布图
Fig.1 Distribution of strong motion stations

表1 近场强震动记录(震中距<50 km)及相关参数<br/>Tab.1 Near-field strong motion records(epicentral distance <50 km)and related parameters

表1 近场强震动记录(震中距<50 km)及相关参数
Tab.1 Near-field strong motion records(epicentral distance <50 km)and related parameters

图2 53JXG台2次地震震加速度时程<br/>Fig.2 The acceleration time-series curves of the 53JXG stations with the two eathquakes

图2 53JXG台2次地震震加速度时程
Fig.2 The acceleration time-series curves of the 53JXG stations with the two eathquakes

图3 8日13日(a)、14日(b)PGA等值线图<br/>Fig.3 Contour map of PGA of the event

图3 8日13日(a)、14日(b)PGA等值线图
Fig.3 Contour map of PGA of the event

图4 2次5.0级地震PGA观测值与几种衰减关系对比<br/>Fig.4 Comparison of the two earthquakes between observed PGA and the event with GMPE

图4 2次5.0级地震PGA观测值与几种衰减关系对比
Fig.4 Comparison of the two earthquakes between observed PGA and the event with GMPE

图5 5个典型台站的观测记录反应谱与设计反应谱比较<br/>Fig.5 Comparison of acceleration response spectra and designed reponse spectra of five typical stations

图5 5个典型台站的观测记录反应谱与设计反应谱比较
Fig.5 Comparison of acceleration response spectra and designed reponse spectra of five typical stations

图6 5个台站的观测记录加速度反应谱对(a)和各周期谱加速度随震中距增大的衰减关系(b)<br/>Fig.6 accderation response spetra pair(a)and the realatianship between the acceleration response spectra and seisinic distance in different cycles(b)of five typical stations

图6 5个台站的观测记录加速度反应谱对(a)和各周期谱加速度随震中距增大的衰减关系(b)
Fig.6 accderation response spetra pair(a)and the realatianship between the acceleration response spectra and seisinic distance in different cycles(b)of five typical stations

图7 3个典型台站强震动记录HVSR谱比曲线<br/>Fig.7 HVSR spectral curves of strong motion records of the three typical stations

图7 3个典型台站强震动记录HVSR谱比曲线
Fig.7 HVSR spectral curves of strong motion records of the three typical stations

图8 强震谱比曲线频率与弱震谱比曲线频率比较<br/>Fig.8 Comparison of predominate frequency beteween mainshock and weak aftershocks

图8 强震谱比曲线频率与弱震谱比曲线频率比较
Fig.8 Comparison of predominate frequency beteween mainshock and weak aftershocks

图9 各台站弱震谱比/强震谱比曲线<br/>Fig.9 The ratio of spectra of weak aftershocks/strong main shock at each station

图9 各台站弱震谱比/强震谱比曲线
Fig.9 The ratio of spectra of weak aftershocks/strong main shock at each station

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备注

引言

1 强震动记录

2 幅值特征

3 衰减关系

4 反应谱特征

5 场地特征与非线性识别

6 结论

期刊信息