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本文研究了溧阳两次地震的前震活动现象,发现溧阳两次地震的前震活动图象具有某些共性特征:(1)前震活动的时间尺度雷同;(2)前震活动频度和强度同具有时强时弱的分期活动特点;(3)震前孕震空区形态相似;(4)临震前地震活动同具有条带分布图象;(5)前震活动在时—空图形上分别形成“时—空”弯形平静区。溧阳两次同源地震前震活动图象具有共性特征这一客观事实,可能反映两次地震在同一区域应力场作用下具有类似的孕震破裂过程。追溯这些过程,它们可能同受震源区及其附近的同一介质和构造条件的制约。
In this paper, we study the foreshock events of the two earthquakes in Liyang and find that the pre-seismic images of the two earthquakes in Liyang have some common features: (1) the time scales of foreshocks are the same; (2) the frequency and intensity of foreshocks are the same (3) the patterns of pre-earthquake pregnant vacant areas are similar; (4) the pre-quake seismic activity has the same distribution pattern; (5) the foreshock activities form “ Time - empty ”curved calm area. The objective fact that the images of the precursory seismic activity of the two same-origin earthquakes in Liyang have common features may reflect the similar seismogenic rupture process under the same regional stress field. Tracing these processes may be constrained by the same media and tectonic conditions in and near the source area.