1695年山西临汾7(1/2)级大地震前地震围空图象
THE SEISMIC GAP PATTERN BEFORE THE LINFEN 7.5 EARTHQUKAKE, SHANXI PROVINCE IN 1695
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摘要: 本文主要利用历史地震资料探讨了山西临汾7(1/2)级大地震前的地震活动图象,发现地震围空区是这次地震前的主要活动特征。文章首先介绍了历史地震资料的来源及其使用原则;进而对空区图象的性质和指标进行了确立,亦探讨了空区的孕育演变过程,分析了临汾7(1/2)级地震与周围地震的关系。作者通过一定的工作,得出了:临汾7(1/2)级地震的发生是华北一系列大震活动后的产物、7(1/2)级大震前,临汾盆地构造应力已处于高度集中状态、临汾地震围空区的孕育和发展大约经历了50年左右的时间,其过程主要包括:构造应力积累-应变加速-平静-地震释放。故应高度注意这个强震活动场所的地震活动图象和演变。Abstract: This paepr mainly discussed the seismicity patterns before the Linden 7.5 earthquake Shanxi Province based on hitorical seismic data, and found that seismic gap was the main characteristic prior to this earthquake.The paper first introduced the source of historical seismic data and the principle of usage; then determined the property of index of the seismic gap, discussed the development process of the gap and also analyzed the relationship between the Linfen 7.2 earthquake and the earthquakes occurred in its surrounding areas. It is concluded that the Linfen 7.5 earthquake is the product of a series of large earthquakes occurred in North China area. Beforevhe 7.2 earthquake, the tectonic Stress in Linfen Basin was highly concentrated and the development of Linfen seismic gap underwent about 350 years.Its process mainly included the variations of tectonic stress accumulation——strain accelaration——quirescence——release by earthquake and the development process of the seismicity pattera of this active place of strong earthquake which attracted great attention.
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[1] 马宗晋等,中国的强震期和强震带,中国地震, 1,1987. [2] 陆远忠等,地震预报的地震学方法,地震出版社,1985. [3] 顾功叙主编,中国地震目录(公元前1831年一公元1963年),科学出版社,1983. -
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