| 华北5级以上地震的震兆——中等地震的集中持续活动c |
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| 引用本文： | 郁曙君.华北5级以上地震的震兆——中等地震的集中持续活动c[J].地震学报,1990,12(2):113-120. |
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| 作者姓名： | 郁曙君 |
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| 作者单位： | 国家地震局地球物理研究所 |
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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.
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| 关 键 词： | 中等前震 地震前兆 地震活动性 |
PRECURSOR FOR EARTHQUAKES OF ML5.0 IN NORTH CHINA,CONCENTRATIVE AND CONTINUOUS ACTIVITY OF MODERATE EARTHQUAKES |
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| 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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