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区域应力场在一定时期内是比较稳定的。尽管大陆地壳存在着不均匀性,存在着断裂带和破碎区,但在稳定的区域应力场作用下,很难由地震活动显示出局部介质强弱区的差异。但是,在一次大地震发生之后,它的能量就会向邻近地区传递,在这种附加力源的作用下,周围不同地区就会显示出地震活动的差异。在介质强度低、岩石较破碎的地区就会发生较多的中、小地震,而在介质强度高、岩石较完整的地区就不容易发生中、小地震,这样就可能形成地震空区或空段。根据这些地震空区或空段我们可以初步确定未来大震的危险区。地震危险区确定之后,我们还可以利用附近再次发生的中、强地震对空区或空段进行检验,以检查地震空区或空段存在的真实性,提高可信程度。本文总结了1966年邢台地震之后中国发生的几次大地震资料,结果表明,用上述方法确定地震危险区比较客观,可靠性较强。
The regional stress field is relatively stable over a certain period of time. Despite the inhomogeneity of the continental crust, there are fault zones and crushing zones. However, under the action of stable regional stress field, it is very difficult to show the difference of local medium strength zones by seismic activity. However, after a major earthquake, its energy will be transmitted to neighboring areas. Under the action of this additional force source, the differences in seismic activity will be shown in different surrounding areas. Medium and small earthquakes will occur in areas with low dielectric strength and shattering of rocks, moderate and small earthquakes will not easily occur in areas with high dielectric strength and relatively complete rock, which may result in the formation of airspace or empty space segment. According to these seismic areas or empty sections, we can initially determine the danger zone of future large earthquakes. After the seismic danger zone is confirmed, we can also use the moderate or strong earthquakes nearby to test the empty area or empty space to check the authenticity of the existence of the vacant space or the empty space, and improve the credibility. This paper summarizes several large earthquakes occurred in China after the 1966 Xingtai earthquake. The results show that the above method is more objective and reliable in determining the seismic hazard zone.