Overlap of the rupture zones of 2003Dayaotwo strong earthquakes
-
摘要: 地震破裂后，破裂区应变能是否已经充分释放，能否在破裂面内再次发生震级接近的地震，是双主震研究的重要问题．通过对2003年云南大姚两个地震序列的双差定位，发现余震区扩展，但两余震区无论在深度上还是在水平位置上基本不重叠．又通过相对定位的方法，发现7月21日主震位于10月16日主震的北西西方向．此外，还通过P波初动极性分析的方法，发现两次主震破裂面的走向略有差别，这与余震区重定位后的分布一致．这些结果表明，大姚两次地震有可能发生在断层系统的不同段落上，虽然距离很近，但是两破裂区基本没有重叠．Abstract: After an earthquake, has the strain energy in the rupture zone been fully released? Will there be another earthquake with similar magnitude occurring on the same fracture surface? These questions are important issues concerning earthquake doublets.In this paper we relocated the 2003 Dayao two earthquake sequences with doubledifference location algorithm (HypoDD), and found that the aftershock zones have expanded, but the two aftershock zones hardly overlap in both depth direction and horizontal direction. The DD relocation result also shows that the July 21 mainshock is to the northwest of the October 16 mainshock. In addition, P-wave polarization analysis result indicates that the fault plane strikes of the two mainshocks deviate slightly from each other. This is consistent with the situation of aftershock zone stretching. These results imply that the two Dayao earthquakes, which are near enough, may have occurred in different segments of a fault system. It can be assumed that these two rupture zones are not overlapped.
-
-
-
期刊类型引用(7)
1. 孙一男，王亮，程国亮. 华北克拉通中西部一维地壳结构特征. 华北地震科学. 2022(03): 40-49 . 
百度学术
2. 曾宪伟，冯建刚，龙锋，莘海亮. 鄂尔多斯西缘中上地壳Pg波速度成像研究. 地震研究. 2017(02): 176-185+333 . 百度学术
3. 魏建民，韩晓明，张帆，陈立峰，李娟，杨红樱. 2015年阿拉善左旗M_S5.8地震序列特征及发震破裂面讨论. 地震工程学报. 2017(05): 919-924 . 百度学术
4. 谢辉，马禾青，马小军，李青梅，张楠，任家琪. 基于背景噪声的宁夏及邻区瑞利波层析成像. 地震. 2016(02): 26-37 . 百度学术
5. 金春华，田小惠，蔡新华，何秋菊. MSDP软件定位方法应用对比. 防灾减灾学报. 2015(01): 65-70 . 百度学术
6. 金春华，何秋菊，蔡新华，田小惠. 宁夏地区地壳新速度模型在地震定位中的应用. 地震. 2015(02): 51-60 . 百度学术
7. 李启雷，李玉丽. 利用地震走时计算波速与震源深度. 地震研究. 2014(S1): 94-97 . 百度学术
其他类型引用(2)
计量
- 文章访问数: 1915
- HTML全文浏览量: 433
- PDF下载量: 112
- 被引次数: 9
下载:
