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根据1973—1979年苏、鲁、皖、豫地区37个中小地震(M=2.1—6.0)震源机制结果的统计分析,得到地震应力场的优势分布:主压应力轴约76°,主张应力轴约344°。表明本区处于北东东向水平压应力和北北西向水平张应力的现代构造应力场作用之中。结合部分中小地震等震线长轴方向及晚第三纪以来断裂走向的优势分布均为北北东向这一特点,推测现今地震破裂具有继承性。最后讨论了本区现代构造应力场与其北部和南部的不同关系。
Based on the statistical analysis of the focal mechanism results of 37 small and medium earthquakes (M = 2.1-6.0) from 1973 to 1979 in the areas of Jiangsu, Shandong, Anhui and Henan, the predominant distribution of seismic stress fields is obtained: the principal compressive stress axis is about 76 °, and the stress axis About 344 °. This indicates that the region is under the action of the modern tectonic stress field in the horizontal compression stress of the north east direction and the horizontal stress of the north and west direction. Combined with the characteristics of the minor-east earthquake isoseismic long axis and late Tertiary, the dominant distribution of faults is north-north-east direction. It is presumed that today’s earthquake rupture has inheritance. Finally, the different relations between modern tectonic stress field and its northern and southern parts are discussed.