| 我国西部地区一些强震及中强震前后波速异常的初步研究（二）——波速异常区及其特性 |
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| 引用本文： | 冯德益,王周元,顾瑾平,盛国英,高世磊.我国西部地区一些强震及中强震前后波速异常的初步研究（二）——波速异常区及其特性[J].地球物理学报,1977,20(2):115-124. |
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| 作者姓名： | 冯德益 王周元 顾瑾平 盛国英 高世磊 |
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| 作者单位： | 国家地震局兰州地震大队 |
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| 摘 要： | 本文介绍了根据近地震直达波到时资料确定震前波速异常区（简称孕震区）的方法,并给出了我国西部地区某些较大地震前波速异常区（孕震区）的初步测定结果。探索并讨论了孕震区的一些基本特性,即孕震区的形状、大小,孕震区的定向,主震在孕震区内所处的部位,孕震区内部波速异常状态的分布与发展等。最后还导出了孕震区线度与震源区尺度间的关系式,并作了简单的讨论。
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| 关 键 词： | 孕震区 波速异常 交切 近地震 中强震 我国西部地区 后波 主震 震中 异常区 |
| 收稿时间： | 1976-06-01 |
PRELIMINARY STUDY OF THE VELOCITY ANOMALIES OF SEISMIC WAVES BEFORE AND AFTER SOME STRONGAND MODERATE EARTHQUAKES IN WESTERN CHINA （Ⅱ）——THE ANOMALOUS REGIONS AND THEIR CHARACTERISTICS |
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| FENG DE-YI,WANG ZOU-YUAN,GU JIN-PING,SHENG GUO-YING,GAO SHI-LEI.PRELIMINARY STUDY OF THE VELOCITY ANOMALIES OF SEISMIC WAVES BEFORE AND AFTER SOME STRONGAND MODERATE EARTHQUAKES IN WESTERN CHINA （Ⅱ）——THE ANOMALOUS REGIONS AND THEIR CHARACTERISTICS[J].Chinese Journal of Geophysics,1977,20(2):115-124. |
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| Authors: | FENG DE-YI WANG ZOU-YUAN GU JIN-PING SHENG GUO-YING GAO SHI-LEI |
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| Institution: | The Seismological Brigade of Lanchow, National Seismological Bureau |
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| Abstract: | In this paper the methods for the determination of the seismic velocity anomalous regions before earthquakes, based on the arrival times of the direct waves are given. Some preliminary results regarding the anomalous regions before some strong and moderate earthquakes in Western China have been obtained. Certain fundamental characteristics of the anomalous regions have been investigated and discussed, namely, the form, the size and orientation of each of the anomalous regions, the relative positions of the main shocks within the regions and the distribution and development of the velocity anomalies. Finally, the relationship between the anomaly size and the linear dimension of the earthquake sources is derived and discussed briefly. |
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