华北5级以上地震的震兆--中等地震的集中持续活动c
PRECURSOR FOR EARTHQUAKES OF ML5.0 IN NORTH CHINA, CONCENTRATIVE AND CONTINUOUS ACTIVITY OF MODERATE EARTHQUAKES
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摘要: 1970年以来,在华北地区(30-42N,109-125E)十次ML5.0地震发生前的若干年内,震中附近都存在4.0ML<6.0的地震集中持续活动的现象.这些地震的活动规模与未来主震的震级有一定的关系.本文将这些地震称为中等前震,定义了标志前震系列活动规模的三个参量:能量、持续时间和活动范围,并通过回归分析建立了它们与主震震级的定量关系.Abstract: Concentrative and continuous activity of earthquakes (4.0ML6.0) occurred within a few years before and around the epicenters of the 10 coming earthquakes of ML5.0 in North China (30-42N,109-125E) since 1970,and there seemed to be a relationship between the scale of activity of these earthquakes and the magnitude of the main shock. These earthquakes are called moderate foreshocks in this study. Three parameters indicating the scale of activity of foreshocks,i.e.,energy release,duration time and area of activity are defined and the relationship between the three parameters and the magnitude of the main shock is established through regression analysis.
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[2] 笠原庆一,1984.地震力学,15——22,赵仲和等译,地震出版社.
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[4] 赵根模,1980.我国若干强震的前兆地震序列.地震研究,3, 125——136,[1] 傅承义,1971.关于地震发生的几点认识.地震战线,8, 35——36,
[2] 笠原庆一,1984.地震力学,15——22,赵仲和等译,地震出版社.
[3] 茂木清夫,1979.论巨大地震.国外地震,2, 1——6
[4] 赵根模,1980.我国若干强震的前兆地震序列.地震研究,3, 125——136,
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