| 一种新的非均匀断层模型及其振幅谱的特征 |
| |
| 引用本文： | 牛志仁,李炳乾.一种新的非均匀断层模型及其振幅谱的特征[J].西北地震学报,1991,13(3):1-14. |
| |
| 作者姓名： | 牛志仁 李炳乾 |
| |
| 作者单位： | 陕西省地震局
(牛志仁)，陕西省地震局(李炳乾) |
| |
| 摘 要： | 本文提出了一种弯曲断层面的非均匀断裂模型。我们把弯曲断层面简化为锯齿形状,当每个锯齿上的滑动是均匀的,同时具有均匀的位错传播速度时,可以得到问题的封闭形式的精确解。对于不同的齿数、齿倾角和场方位角,计算了体波辐射的振幅谱。研究发现,弯曲断层会使谱曲线出现异常的峰值,异常峰值的位置与齿数有关,随齿数的增加向高频方向移动。齿倾角的变化会引起振幅谱曲线上异常峰附近谱包络线的变化。不同方位的观测点处的振幅谱形状各不相同。仔细地将观测谱与理论谱对比,有可能使人们了解断层面的非平面性质。
|
| 关 键 词： | 地震 断层模型 振幅谱 震源机制 |
| 收稿时间： | 1990/8/10 0:00:00 |
A NEW NON-UNIFORM FAULT MODEL AND ITS AMPLITUDE-SPECTRAL CHARACTER |
| |
| Niu Zhiren and Li Bingqian.A NEW NON-UNIFORM FAULT MODEL AND ITS AMPLITUDE-SPECTRAL CHARACTER[J].Northwestern Seismological Journal,1991,13(3):1-14. |
| |
| Authors: | Niu Zhiren and Li Bingqian |
| |
| Institution: | Seismological Bureau of Shaanxi Province, Xi''an, China and Seismological Bureau of Shaanxi Province, Xi''an, China |
| |
| Abstract: | In this paper, a new non-uniform fault model with crooked fault surface is proposed. The crooked fault surface has been simplified as zigzag shape. When the slip and the travel velocity of dislocation on each saw tooth are uniforrm, we have found the analytic solution in enclosed form for the simplified problem. The amplitude spectra of body wave radiation have been calculated for different numbers of tooth, inclined angles of tooth and position angles of the field. The studied results show:1) the crooked fault can make unusual peak appear in spectral curve, the position of the peak is dependent on the tooth number, and moves towards the point of high frequency as the number increasing; 2) the change of the inclined angle can cause the change of spectral envelope line near the unusual peak; 3) the shape of amplitude spectrum is different for the observing point with different position angles. Comparing observed with theoretic spectra carefully, ones perhaps understand the non-planar feature of fault surface. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《西北地震学报》浏览原始摘要信息 |
| 点击此处可从《西北地震学报》下载免费的PDF全文 |
|
