强烈地震常常伴随着地裂的发生,这是一种普遍现象,我国古代早已有很多这方面的记载,近年来国内外多次大地震的实例更充分说明了这一点。尤其是1976年唐山地震,造成了分布非常广泛的、大量的地裂。这些地裂,有的在极震区附近,有的在远离极震区的地方,如柏各庄、乐亭、滦南、汉沽、卢台、天津等地。有些地裂有明显的方向性,有些则不规律。长的地裂断断续续达数百米至数公里,短的不过几厘米。宽的地裂达1米以上,窄的仅隐约可见。有时单独出现,有时成群分布。尤其在液化区,常与 Strong earthquakes are often accompanied by the occurrence of ground fissures. This is a common phenomenon. There have been many records in this area in ancient China. Examples of recent major earthquakes at home and abroad have more fully illustrated this point. In particular, the Tangshan earthquake in 1976 caused a very extensive and extensive land crack. These lands are cracked, some in the vicinity of the extreme earthquake zone, and some in areas far away from the extreme earthquake zone, such as Baigezhuang, Leting, Weinan, Hangu, Lutai, and Tianjin. Some land cracks have obvious directionality and some are irregular. The long land is split intermittently for hundreds of meters to several kilometers, but only a few centimeters short. Wide cracks of more than 1 meter, narrow only vaguely visible. Sometimes appear alone, sometimes in groups. Especially in the liquefaction area, often with