| 双差定位法在地震丛集精确定位中的应用 |
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| 引用本文： | 刘劲松,Kin-Yip Chun,刘福田,郝天珧.双差定位法在地震丛集精确定位中的应用[J].地球物理学进展,2007,22(1):137-141. |
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| 作者姓名： | 刘劲松 Kin-Yip Chun 刘福田 郝天珧 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所, 北京 100029;2.同济大学海洋与地球 科学学院,上海 200092;3.加拿大多伦多大学物理系地震学实验室，加拿大，多伦多 |
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| 基金项目： | 加拿大地调局(Geological Survey of Canada,Class Grant Agreement,K.-Y.Chun)，国家自然科学基金(40034010)资助 |
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| 摘 要： | 应用双差定位方法(hypodd)对北美Loma Prieta 地区的分属于3个地震丛集的47个地震进行了精确定位.采用交叉谱法精确求取信号的走时差；同时采用人机联做方式在时域调整、修正按自动方式无法准确提取时差的信号，确保每个事件对的走时差精度.重定位后，在几百米的范围内，原来相互重叠的震源位置聚集为三个明显分离的丛集;水平方向的相对位置平均误差为8.5米，震源深度方向的平均误差为23.4 m.
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| 关 键 词： | 地震定位 双差定位法 地震丛集 交叉谱 |
| 文章编号： | 1004-2903（2007）01-0137-05 |
| 收稿时间： | 2006-03-10 |
| 修稿时间： | 2006-06-11 |
Relocation of earthquake clusters using the double difference technique |
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| LIU Jing-song,Kin-Yip Chun,Gary A.Henderson,LIU Fu-tian,HAO Tian-yao.Relocation of earthquake clusters using the double difference technique[J].Progress in Geophysics,2007,22(1):137-141. |
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| Authors: | LIU Jing-song Kin-Yip Chun Gary AHenderson LIU Fu-tian HAO Tian-yao |
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| Institution: | 1. The Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ; 2. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China 3. Seismological Laboratory, Department of Physics, University of Toronto, Toronto, Canada |
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| Abstract: | We use the Double-Difference(DD) method to relocate 47 earthquakes from Loma Prieta,California.The events chosen in this study have previously been well identified as members of three multiplets,each made up of a cluster of nearly identical microearthquakes(magnitudes from 0.9 to 2.0).Prior to the relocation,each of these overlapping clusters each had a radius measuring 200m or larger.The relocation reduces the cluster radii by approximately an order of magnitude,resulting in three well-separated micro-clusters.The estimated relative epicentral error of the relocated events is 8.5 m while the corresponding depth error is 23.4 m. |
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| Keywords: | earthquake location double difference method earthquake clusters cross spectrum |
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