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Title:: Study on Spatial Distribution of Simulated Acceleration Ground Motion Duration of Wenchuan Earthquake

作者:: 钟菊芳¹; 袁峰¹; 2; 邱卓¹; (1.南昌航空大学土木建筑学院,江西南昌 330063; 2.赣州市城乡规划设计研究院,江西赣州 341000)

Author(s):: ZHONG Jufang¹; YUAN Feng¹; 2; QIU Zhuo¹; (1.College of Civil Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China)(2.Urban Planning Design Institute of Ganzhou,Ganzhou 341000, Jiangxi, China)

Keywords:: ground motion duration; stochastic finite-fault method; source parameters; Wenchuan earthquake; spatial distribution

摘要:: 利用随机有限断层时程模拟程序,模拟符合汶川地震区域特性的水平分量加速度时程,分析模拟加速度时程持时的空间分布和变化规律。结果表明:模拟加速度时程的各种持时分布均能很好地体现持时的破裂方向性效应,但未能清晰反映持时的上盘/下盘效应; 模拟加速度时程的重要持时能反映近断层区域持时明显小于远场持时的特点,但在总体空间分布上更为“单一”,未表现出明显的区域“突变”现象; 相较于重要持时,模拟加速度时程与台站记录时程的Bolt持时之间存在更大差异; 模拟加速度时程的重要持时与相对Bolt持时随断层距的变化趋势,总体上能反映水平分量记录时程持时的空间变化特性。

Abstract:: Using the stochastic finite fault time history simulation program, we simulated the horizontal component acceleration time history in accordance with the regional characteristics of Wenchuan earthquake, and analyze the spatial distribution and variation law of simulated acceleration time duration. The results show that the distributions of each time duration of simulated acceleration time history can reflect the rupture directivity effect of time duration, but can not clearly reflect the upper/lower disk effect. Moreover, the significant duration of simulated acceleration time history can reflect the characteristics that the duration in near fault area is obviously smaller than that in far field, but it is more “single” in the overall spatial distribution and does not show obvious regional “mutation” phenomenon. Compared with the significant duration, there is a greater difference between the simulated acceleration duration and the Bolt holding time recorded by the station. The changing trend of these two durations could generally reflect the spatial variation characteristics of the horizontal component recording with the fault distance.