| 1998~2003年伽师三次不同类型Ms6级地震震源破裂过程及短期内余震活动特征 |
| |
| 引用本文： | 赵翠萍,陈章立,郑斯华.1998~2003年伽师三次不同类型Ms6级地震震源破裂过程及短期内余震活动特征[J].地球物理学报,2008,51(4):1093-1102. |
| |
| 作者姓名： | 赵翠萍 陈章立 郑斯华 |
| |
| 作者单位： | 中国地震局地震预测研究所,北京 100036 |
| |
| 摘 要： | 利用大量远场观测地震图反演了新疆伽师地区三次不同机制类型Ms6级地震的破裂过程.结果表明，1998年8月2日Ms6.1级地震破裂尺度小，破裂过程简单,最大滑动量为12 cm，主破裂过程持续时间为8 s.1998年8月27日Ms6.5地震破裂过程的空间分布反映出双侧破裂特征，主破裂过程在前13 s基本完成，最大滑动量为63 cm，破裂面上起始破裂点两侧的滑动矢量方向不同.2003年2月24日Ms6.8地震的破裂过程最为复杂，震源时间函数由两次上升时间组成，破裂一共持续了32 s，最大滑动量为32 cm.研究表明，余震主要发生在主震破裂图像中大滑动量区域的外围或滑动量变化梯度较大的区域，主震后短期内发生的余震震源机制解也与破裂面上断层的错动方向一致，表明余震的位置和机制与主震破裂所引起的应力重新分布有关.
|
| 关 键 词： | 伽师强震 震源破裂过程 余震分布 震源机制解 |
| 收稿时间： | 2007-4-4 |
| 修稿时间： | 2008-1-28 |
Source rupture process of 3 Jiashi Ms6 events（1998~2003） and its correlation with the aftershock activity |
| |
| ZHAO Cui-Ping,CHEN Zhang-Li,ZHENG Si-Hua.Source rupture process of 3 Jiashi Ms6 events（1998~2003） and its correlation with the aftershock activity[J].Chinese Journal of Geophysics,2008,51(4):1093-1102. |
| |
| Authors: | ZHAO Cui-Ping CHEN Zhang-Li ZHENG Si-Hua |
| |
| Institution: | Institute of Earthquake Science, China Earthquake Administration, Beijing 100036,China |
| |
| Abstract: | By using the far field body waves, the temporal and spatial rupture process of 3 Ms6.1 events with different focal mechanisms occurred in Jiashi，Xinjiang, from 1998 to 2003 were studied. The rupture pattern of Aug.2, 1998, reveals that the rupture zone is small, the rupture process is simple and lasted about 8s, the maximum slip is 12cm. The rupture process of Aug.27, 1998, demonstrates a bilateral rupture characteristic, the process finished within 13s with the maximum slip of 63cm. The rupture process of Ms6.8 on Feb. 24 2003 is the most complicated among them. Its source time function is composed of 2 rise periods, and totally lasted 32s, with the most slip 32cm. Our study reveals that aftershocks following the corresponding main shock occurred along the edge of area formed by large main shock slip on the fault plane, or on the area of slip rapidly decreased. Furthermore, aftershocks following the main shock within the first two weeks exhibit focal mechanisms coincident with the direction of the main shock slip, suggesting that the location and mechanism of aftershocks following the main shock are related with the stress redistribution after the main shock occurred. |
| |
| Keywords: | Jiashi strong earthquakes Source rupture process Aftershock distribution Focal mechanism |
|
| 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 |
|
