| 远场地震波辐射能计算以及对近断层地面运动的约束 |
| |
| 引用本文： | 刘博研,史保平.远场地震波辐射能计算以及对近断层地面运动的约束[J].地球物理学报,2011,54(10):2597-2605. |
| |
| 作者姓名： | 刘博研 史保平 |
| |
| 作者单位： | 中国科学院研究生院,北京 100049 |
| |
| 基金项目： | 中国科学院知识创新工程重要方向项目，北京市科委首都圈固体地球可视化及地震危险性分析项目 |
| |
| 摘 要： | 从圆盘断层模型出发,根据地震波能量表象定理推导出了滑移弱化过程中远场S-波辐射能量表达式,并同已有的动力学模型作了比较.结果表明,得到的模型能量值或视应力的取值强烈地依赖于断层上的动态、静态应力降和破裂传播速度,而破裂速度则对应了断层带模型中断层破坏过程所耗散的能量.动摩擦应力上调和应力下调力学机制在能量求解中得到了充...
|
| 关 键 词： | 滑移弱化 地震波辐射能 视应力 应力降 加权滑动位移 |
| 收稿时间： | 2010-08-31 |
The calculation of far-field radiated seismic energy and constraint on near-field ground motion |
| |
| LIU Bo-Yan,SHI Bao-Ping.The calculation of far-field radiated seismic energy and constraint on near-field ground motion[J].Chinese Journal of Geophysics,2011,54(10):2597-2605. |
| |
| Authors: | LIU Bo-Yan SHI Bao-Ping |
| |
| Institution: | Graduate University, Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | For a circular fault model, we re-derive the mathematical expression for calculating the far-field radiated S-wave energy based on the slip-weakening model. Radiated energy and apparent stress depend on the static and dynamic stress drop, as well as the rupture velocity for Madariaga model; while the rupture velocity corresponds to the dissipated energy in the fault rupture process of fault zone models. Fault frictional overshoot and undershoot mechanisms described by slip-weakening constitutive relation are involved in the consideration of estimate of radiated energy without any assumption. Combined with near-fault work associated with permanent deformation of the medium due to fault slip, we also propose a new technique to restrain the bound of peak ground velocity (PGV) and peak ground acceleration (PGA), respectively. Take 2008 MW7.9 Wenchuan earthquake and 1999 MS7.6 Chichi earthquake as examples, with a comparison to the McGarr and Fletcher approach and Brune model, we found that the values of near-fault particle velocities we obtained for these two earthquakes are generally smaller and closer to the values derived from real data. In other words, if the far-field energy solution can reach a considerable accuracy, it would be a straightforward way to constrain the near-fault ground motion or to estimate source parameters including rupture speed, static and dynamic stress drops. |
| |
| Keywords: | Slip-weakening Radiated seismic energy Apparent stress Stress drop Slip-weighted average slip rate |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
