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华北是中国东部的多震区,也是世界上少有的地震记载久远而连续的地区。至少从明代建立地方志以来,4 3/4级以上的地震,尤其是6级以上的地震很少遗漏。因而,我们可以仔细研究它们在时间上接近真实的起伏和在空间域内的动态图象。 华北地震区的范围有不同的提法,有大、小华北之别。考虑到地震与地质构造活动的统一性,也为了不涉及银川带与南北地震带的复杂情况,本文讨论问题的范围仅限于小华北,即北纬34°—41°、东经108°—123°的范围。
North China is a multi-earthquake zone in eastern China and also a rare and continuous earthquake recorded in the world. Since the establishment of the local chronicles at least from the Ming Dynasty, rarely do earthquakes of 4 3/4 or above, especially earthquakes of magnitude 6 or above, are rarely missed. Thus, we can examine carefully their real-time fluctuations in time and the dynamic images in the spatial domain. There are different references to the scope of the North China earthquake area, with differences between large and small North China. Considering the unity of earthquakes and geological tectonics activities and the fact that the complex conditions of the Yinchuan belt and the north-south seismic zone are not involved, the scope of the discussion in this paper is limited to Xiaohua North, ie 34 ° -41 ° North latitude and 108 ° -123 ° East longitude range.