GP断层破裂模型在青海门源M_(S)6.9地震强地面运动模拟的适用性研究  

Applicability study of the GP fault rupture model in strong ground motion simulation for the Qinghai Menyuan M_(S)6.9 earthquake

作　　者：罗超 曹晓雨 高阳[3] 徐飞 冯怀平[1] 王昊[1,2] LUO Chao;CAO XiaoYu;GAO Yang;XU Fei;FENG HuaiPing;WANG Hao(Shijiazhuang Tiedao University,State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Safty Engineering and Emergency Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]石家庄铁道大学土木工程学院,石家庄050043 [3]石家庄铁道大学安全工程与应急管理学院,石家庄050043

出　　处：《地球物理学报》2024年第2期534-547,共14页Chinese Journal of Geophysics

基　　金：国家重点研发计划项目(2021YFB2600800);国家自然科学基金面上项目(52078311);河北省重点研发计划项目(21375407D);河北省青年拔尖人才项目(BJ2020055);中国国家铁路集团有限公司科技研发计划(P2022G013);河北省地震科技星火计划项目(大跨度桥梁抗震韧性评价(DZ2023120500009))资助.

摘　　要：2022年1月8日青海省门源县发生M_(S)6.9地震,震中附近遭受了强烈地震破坏.为验证Graves和Pitarka开发的GP断层破裂模型在震前对中国地区地震动场的预测与评估能力,本文基于GP法,考虑不同上升时间系数(rc)的影响,对门源地震进行了确定性地震动模拟.将模拟结果在地震动衰减规律、波形与幅值和烈度分布三个方面分别与青藏地区的地震动峰值预测方程、强震观测记录和根据强震记录自动产出的烈度图进行了对比.结果表明,当rc为9.0时,模拟记录与实测记录和地震动峰值预测方程基本一致.本文较好的重现了门源地震的强震动场,在合理选取rc的情况下,GP法可以应用于中国地区震前强地震动场的预测和估计.On January 8,2022,a M_(S)6.9 earthquake struck Menyuan County,Qinghai Province.The vicinity of the epicenter suffered strong seismic damage.To verify the ability of the GP fault rupture model developed by Graves and Pitarka in predicting and evaluating the ground motion field in China before the earthquake,this paper performs deterministic ground motion simulations of the Mengyuan earthquake based on the GP method,considering the effects of different rise time coefficients(rc).The simulation results were compared with the ground motion prediction equations of Qinghai-Tibet region,the strong-motion observation records and the intensity maps automatically generated from the strong-motion records in terms of ground motion attenuation pattern,waveform and amplitude,and intensity distribution,respectively.Comparing the waveforms of simulated records from a near-field station and strong earthquake records.The results show that when the rc is 9.0,the simulated records are in good agreement with the measured records and the ground motion prediction equation.This paper reproduces the strong motion field of the Menyuan earthquake.The GP method can be applied to the prediction and estimation of the strong ground motion field before the earthquake in China with a reasonable selection of rc.

关 键 词：门源M_(S)6.9地震 GP断层破裂模型 强地面运动 上升时间系数 宽频带地震动模拟 

分 类 号：P315[天文地球—地震学]