2014年云南鲁甸M_(W)6.1地震强地面运动模拟  

Strong ground motion simulation for the 2014 M_(W)6.1 Ludian,Yunnan earthquake

作　　者：刘奕君[1] 李小军[1,2] 赵晓芬 徐超[1] 温增平[1] Liu Yijun;Li Xiaojun;Zhao Xiaofen;Xu Chao;Wen Zengping(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]北京工业大学建筑工程学院,北京100124

出　　处：《地震学报》2024年第4期677-694,共18页Acta Seismologica Sinica

基　　金：国家重点研发项目(2020YFA0710603);中国地震局地球物理研究所基本业务费(DQJB22B27)共同资助.

摘　　要：基于震源运动学模型,采用宽频带混合模拟方法,对2014年鲁甸M_(W)6.1地震开展了考虑复杂震源破裂过程的地震动模拟,将代表性场点的模拟结果与实际观测的强震记录进行对比,分析了不同震源模型对场点强地面运动特征影响的差异。结果表明:就震源尺度有限的中等地震而言,地震矩相近的不同震源破裂模型对震中距稍远场点的地震动影响差异相对较小,而对近震源区场点的地震动特征影响差异则较为明显。此外,不同震源模型模拟的地震动参数空间分布结果显示,不同震源模型对地震动的空间分布形态具有显著影响。Based on the intensity and aftershock distribution,researchers unanimously agree that the rupture of the 2014 M_(W)6.1 Ludian,Yunnan earthquake exhibits a certain degree of complexity.Zhang et al(2015)used broadband strong motion records within a 250 km range from the epicenter,along with full waveform data of near-field and far-field broadband body wave data,to invert the rupture process of the Ludian M_(W)6.1 earthquake base on both a single fault model and two intersecting conjugate fault models.Their results indicate that the Ludian M_(W)6.1 earthquake was a complex seismic event,characterized by the successive rupture of two conjugate faults in the northwest and northeast directions.Significant progress has been made in studying the characteristics of strong ground motion related to the Ludian earthquake and associated issues.The existing conclusions about the distribution of seismic parameters in affected region are directly inferred or indirectly synthesized from existing data,yet the seismic characteristics caused by complex seismic source ruptures have not been considered。To investigate the influence of different rupture process models on ground motion simulation of the M_(W)6.1 Ludian earthquake,a hybrid broadband ground motion simulation method known as the GP method(Graves,Pitraka,2010)was applied to synthesize acceleration,velocity waveforms,and acceleration response spectra in the near-field area based on kinematic source models.The source models used for comparison in this study are derived from Zhang et al(2015),which includes two single fault rupture models and one intersecting conjugate fault model.The study adopted the crustal velocity structure model of the Yunnan region to calculate the Green’s function.The GP method combines a deterministic approach in the low-frequency range(f<1 Hz)with a semi-stochastic approach in the high-frequency range(f>1 Hz).For f<1 Hz,this methodology allows for a theoretically rigorous representation of fault rupture and wave propagation effects,to generate gro

关 键 词：共轭断层破裂 强地面运动 复杂震源破裂过程 传播路径 

分 类 号：P315.9[天文地球—地震学]