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1977年8月23日,西安市北郊草滩公社发生2.9级地震,9月5日又在同一地方发生2.2级地震。震后现场考察结果表明,两次地震在宏观上可视为同源地震,它们的震中位置基本一致,极震区未造成破坏,但有感范围比较大。特别值得注意的是,震后西安地裂缝日趋明显,并不断向两侧扩展,市区从南向北清楚地显示出五条北东、北东东向规则排列的地裂缝,地面建筑及各种工程设施均遭受到不同程度的破坏,引起了社会上的广泛重视,地震工作者更为关切。因为它既可能造成震害,又直接影响到社会主义建设事业,本文就草滩地震的一些基本情况提出几点粗浅看法。
On August 23, 1977, an earthquake of magnitude 2.9 occurred at Caotan Commune in the northern suburbs of Xi’an. On September 5, another 2.2 magnitude earthquake occurred in the same place. The results of on-site investigation after the earthquake show that the two earthquakes can be regarded macroscopically as homologous earthquakes, their epicenter positions are basically the same, and the meizoseisonic regions are not damaged, but the range of sensation is relatively large. It is particularly noteworthy that after the earthquake, ground fissures in Xi’an have become increasingly evident and have been expanding to both sides. The urban area clearly shows five north-east and north-east-east regular ground fissures, ground structures and various Engineering facilities are subject to varying degrees of damage, aroused widespread community attention, earthquake workers are more concerned. Because it can not only cause damage but also directly affect the cause of socialist construction, this paper puts forward some superficial opinions on some basic conditions of the Yotan earthquake.