龙门山断裂中段在整个龙门山断带中,地质构造最为发育和复杂;地震活动的强度和频度也算最大;由于附近中小城市,工矿等单位较多,人口密集,当其地震发生后的影响显得突出并引人注意。为此,讨论该段的地震活动及影响场的特征,是很有意义的。 The middle part of the Longmenshan fault has the most developed and complex geologic structure in the whole Longmenshan fault belt. The intensity and frequency of the earthquake activity are also the largest. Due to the large number of units in the nearby small and medium-sized cities, such as industrial and mining areas and densely populated areas, The impact is outstanding and noticeable. Therefore, it is significant to discuss the seismic activity of this section and the characteristics of the field.