| 2003年云南大姚两次强震破裂区重叠程度的研究 |
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| 引用本文： | 包丰,倪四道,汪贞杰,王伟涛,闻学泽,刘强.2003年云南大姚两次强震破裂区重叠程度的研究[J].地震学报,2011,33(3):279-291. |
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| 作者姓名： | 包丰 倪四道 汪贞杰 王伟涛 闻学泽 刘强 |
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| 作者单位： | 1）中国合肥230026中国科学技术大学地球和空间科学学院nbspnbsp 蒙城地球物理国家野外科学观测研究站2）中国北京100081中国地震局地球物理研究所3）中国成都610041四川省地震局 |
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| 基金项目： | 中国科学院知识创新工程(kzcx2-yw-116-01); 地震行业基金(200808078,200708035)资助. |
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| 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...
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| 关 键 词： | 大姚地震序列 破裂区重叠 双差地震定位法 相对地震定位法 |
Overlap of the rupture zones of 2003 Dayao two strong earthquakes |
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| Bao Feng,Ni Sidao,Wang Zhenjie,Wang Weitao,Wen Xueze,Liu Qiang.Overlap of the rupture zones of 2003 Dayao two strong earthquakes[J].Acta Seismologica Sinica,2011,33(3):279-291. |
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| Authors: | Bao Feng Ni Sidao Wang Zhenjie Wang Weitao Wen Xueze Liu Qiang |
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| Institution: | 1）Mengcheng National Geophysical Observatory, School of Earth and Space Sciences,University of Science and Technology of China, Hefei 230026, China2）Institute of Geophysics, China Earthquake Administration, Beijing 100081, China3）Earthquake Administration |
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| 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 double difference 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. |
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| Keywords: | Dayao earthquake sequences rupture zone overlap double-difference earthquake location relative earthquake location |
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