1 观察物(?)概况工作中使用了三口水位观测井及五个水氡观测泉点的观测资料。三口观测井均位于南北地震带北段的六盘山地震带上,大地构造位置属于祁吕贺兰山字型构造体系的马蹄型盾地也(图1)。其基本情况见表1。其中陇3号井含水层为第三系河湖中沉积的砂砾岩,为浅层 1 Observation object (?) Overview Three observations of water level observation wells and five observation points of water radon were used in the work. The three observation wells are located on the Liupan Mountain seismic belt in the northern segment of the North-South Seismic Belt. The geotectonic position belongs to the horseshoe-shaped shield land of the Qilu Helan Mountain structural system (Figure 1). The basic situation is shown in Table 1. Among them, the Long 3 well aquifer is a conglomerate of sediments deposited in Tertiary rivers and lakes, which is shallow