首页 | 官方网站   微博 | 高级检索  
     

利用断层围陷波研究昆仑山口西8.1级地震破裂面
引用本文:李松林,张先康,樊计昌.利用断层围陷波研究昆仑山口西8.1级地震破裂面[J].地震学报,2005,27(1):42-50.
作者姓名:李松林  张先康  樊计昌
作者单位:(中国郑州450002中国地震局地球物理勘探中心)
基金项目:地震科学联合基金重点项目(201001)资助,中国地震局地球物理勘探中心论著编号: RCEG200305.
摘    要:利用横跨地表破裂带的小点距的地震测线, 对2001年11月14日昆仑山口西8.1级地震进行了断层围陷波的观测实验. 经过数字滤波和频谱分析等技术, 由地震记录图中分离出了断层围陷波. 资料处理结果表明: ① 无论是人工地震震源还是天然地震震源, 只要位于断层带内或紧靠断层带, 均能激发断层围陷波; ② 断层围陷波的能量主要集中于断层带内, 其振幅随测点与断层带距离的增加而急剧衰减; ③ 断层围陷波的优势频率与断层的宽度及断层带内介质的速度有关, 断层带越宽, 或断层带内部介质速度越低, 则观测到的断层围陷波的优势频率越低; ④ 断层围陷波存在着频散现象; ⑤ 根据昆仑山口西地震测线断层围陷波的观测结果, 可推断该处破裂面宽度为300 m左右, 远远大于地表破裂带的宽度. 

关 键 词:断层围陷波    昆仑山口西8.1级地震    地震破裂面
文章编号:0253-3782(2005)01-0042-09
修稿时间:2003年9月8日

STUDY ON RUPTURE ZONE OF THE M=8.1 KUNLUN MOUNTAIN EARTHQUAKE USING FAULT-ZONE TRAPPED WAVES
Li Songlin,Zhang Xiankang,Fan Jichang.STUDY ON RUPTURE ZONE OF THE M=8.1 KUNLUN MOUNTAIN EARTHQUAKE USING FAULT-ZONE TRAPPED WAVES[J].Acta Seismologica Sinica,2005,27(1):42-50.
Authors:Li Songlin  Zhang Xiankang  Fan Jichang
Abstract:The observation of the fault zone trapped waves was conducted using a seismic line with dense receivers across surface rupture zone of the M =8.1 Kunlun Mountain earthquake. The fault zone trapped waves were separated from seismograms by numerical filtering and spectral analyzing. The results show that: a) Both explosion and earthquake sources can excite fault zone trapped waves, as long as they locate in or near the fault zone; b) Most energy of the fault zone trapped waves concentrates in the fault zone and the amplitudes strongly decay with the distance from observation point to the fault zone; c) Dominant frequencies of the fault zone trapped waves are related to the width of the fault zone and the velocity of the media in it. The wider the fault zone or the lower the velocity is, the lower are the dominant frequencies; d) For fault zone trapped waves, there exist dispersions; e) Based on the fault zone trapped waves observed in Kunlun Mountain Pass region, the width of the rupture plane is deduced to be about 300 m and is greater than that on the surface.
Keywords:fault  zone trapped waves  M  =8  1 Kunlun Mountain earthquake  seismic rupture plane
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《地震学报》浏览原始摘要信息
点击此处可从《地震学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号