| 华北地区强震前的地震活动图象 |
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| 引用本文： | 李钦祖,靳雅敏,于新昌.华北地区强震前的地震活动图象[J].地震学报,1982,4(4):380-388. |
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| 作者姓名： | 李钦祖 靳雅敏 于新昌 |
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| 作者单位： | 河北省地震局 |
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| 摘 要： | 本文分析了华北地区(30——42N,105——124E)自16世纪以来8次7.5级以上大地震发生之前的地震活动图象.发现在这些大地震发生之前的若干年(绝大多数不超过20年),都表现出一个M4(3/4)地震在某一范围內相对较集中活动的区域,然后在该区中部或边缘发生大地震。 唐山7.8级地震前,随着大地震发生时间的逼近,Ms4.0地震的震中分布,在大范围活动的基础上,分阶段地逐步自外围向主震震中收缩,然后发生大地震。这种地震活动图象的演变过程可分成若干阶段的现象,对于研究震源性质、地震孕育过程和中长期地震预报等,可能具有一定意义。
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SE1SMICITY PATTERN BEFORE GREAT EARTHQUAKES IN NORTH CHINA |
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| Affiliation: | Seismological Bureau of Hebei Province |
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| Abstract: | The seismicity patterns before 8 great earthquakes with M>7.5 of North China (30-40N, 105-124E) occurred since the 16th century have been analyzed. It wasfound that before any of them, earthquakes with M43/4 usually occurred in a periodof several years (in most cases not longer than 20 years) within a rather restricted region. Then finally the major earthquake took place at the center or near the edge of that region.Before the 1976 Tangshan Earthquake of M=7.8, the epicenters of earthquakes of M4.0 within such a region as above-mentioned gradually came near to the epicenter of the great Tangshan Earthquake by stages as time approached its outbreak. Such a fact of variation of seismicity pattern in stages before a great earthquake probably contains certain implications related to the study of focal properties, seismogenic process, long-term earthquake prediction and so on. |
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