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天水——龙陵北北东向地震带上的强震活动与整个西南地区的地震活动呈同步起伏;与其它三条北西向弧形构造地震带的活动互相呼应;强震活动的时空图象具有历史的重现性;震中呈现北东——南西两头跳的迁移特点;且具有一类空区的填空性。 本文还对1976年发生在该地震带上龙陵、松潘、盐源三组强震的某些前兆异常的互相联系、互相呼应关系作了初步的探讨。
The strong earthquakes on the NE-EAST seismic belt in Tianshui-Longling show a synchronous fluctuation with the seismic activity in the entire southwestern region, echoing the activities of the other three NW-trending structural seismic zones, and the spatiotemporal images of strong earthquakes have a history The epicenter shows the migratory characteristics of the north-south-west two-jumps and has a kind of empty space filling. This paper also makes a tentative discussion on the interrelated and reciprocal relations between some precursory anomalies occurred in 1976 in the three major series of strong earthquakes such as Longling, Songpan and Yanyuan in the earthquake zone.