强生银,
王宏伟^,,
温瑞智,
李春果,
任叶飞
中国地震局工程力学研究所, 中国地震局地震工程与工程震动重点实验室, 哈尔滨 150080

基金项目: 中国地震局工程力学研究所基本科研业务费专项（2020C05），黑龙江省科学基金项目（LH2020E021），国家自然科学基金项目（51878632，51808514）资助


详细信息

作者简介: 强生银, 男, 1996年生, 博士研究生, 主要从事地震动数值模拟等相关研究.E-mail: qiangsy_96@outlook.com

通讯作者: 王宏伟, 男, 1990年生, 博士, 助理研究员, 主要从事地震动模型及模拟等相关研究.E-mail: whw1990413@163.com

中图分类号: P315

收稿日期:2021-06-11
修回日期:2021-08-02
上线日期:2021-12-10

Three-dimensional ground motion simulations by the stochastic finite-fault method for the Yangbi, Yunnan M_S6.4 earthquake on May 21, 2021

QIANG ShengYin,
WANG HongWei^,,
WEN RuiZhi,
LI ChunGuo,
REN YeFei
Institute of Engineering Mechanics, China Earthquake Administration; Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China



More Information

Corresponding author: WANG HongWei,E-mail:whw1990413@163.com

MSC: P315

--> Received Date: 11 June 2021
Revised Date: 02 August 2021
Available Online: 10 December 2021


摘要
摘要:2021年5月21日云南省大理州漾濞县发生M_S6.4地震，震中附近遭受了强烈地震破坏.为预测此次地震的地震动影响场，利用震源运动学破裂随机模型，基于随机有限断层三维地震动模拟方法，给出了此次地震中28个触发强震动台站的三分量加速度时程模拟记录，并结合强震动观测记录，估计了此次地震的地震应力降及震源破裂过程，进一步模拟给出了此次地震中2823个虚拟观测点的三分量加速度时程.结果表明，模拟记录的峰值地面加速度（PGA）、峰值地面速度（PGV）与观测值接近，并体现了地震动峰值的衰减规律、近场饱和效应和破裂方向性效应；模拟与观测记录的5%阻尼比拟加速度反应谱（PSA）的幅值接近、谱形相似，在0.05~10 s周期段，模拟记录可以很好地预测地震动.基于三分量模拟记录给出了漾濞M_S6.4地震的仪器测定地震烈度图，与云南省地震局发布的烈度图接近，极震区烈度最高可达Ⅷ度，震源破裂方向性导致震中SE方向的烈度普遍高于NW方向，受局部场地条件影响沿洱海西侧出现高烈度异常区.
关键词: 漾濞M_S6.4地震/
随机有限断层法/
地震动模拟/
地震烈度

Abstract:An M_S6.4 earthquake occurred in Yangbi county, Yunnan Province on May 21, 2021, and the epicentral area suffered from strong earthquake damage. The modified stochastic finite-fault method was used to reproduce the three-component ground motions at 28 strong-motion stations triggered in the Yangbi M_S6.4 earthquake using a series of source kinematic rupture models stochastically generated. Compared with the observed ground motions, the earthquake stress drop and the potential source rupture model were firstly estimated. Moreover, ground-motion acceleration time histories at 2823 virtual observation points produced by the Yangbi M_S6.4 earthquake were provided by the stochastic finite-fault simulation. The peak ground accelerations (PGAs) and peak ground velocities (PGVs) of the simulated ground motions, in good agreement with the observed values, well describe the distance attenuation, the near-field saturation effects and the rupture directivity effects. Meanwhile, amplitude and shape of 5%-damped pseudo spectral accelerations (PSAs) also show good agreement between the simulated and observed ground motions. The simulations well represent the observations at a wide period range from 0.05 to 10 s. The seismic intensity map was plotted based on the simulated three-component recordings, approximately consistent to that officially released by the Earthquake Administration of Yunnan Province. The epicentral meizoseismal area reached a highest intensity Ⅷ. Intensity to the SE of epicenter is generally higher than that to the NW due to the source rupture directivity. High intensity anomalous areas occur along the west bank of Erhai Lake due to the local site condition.
Key words:Yangbi M_S6.4 earthquake/
Stochastic finite-fault method/
Ground motion simulation/
Seismic intensity



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