【摘要】 1985～1988年在丰城堡—祝家庄地区进行了偶极法电测深观测。观测中采用供电偶极距为1000m,测量偶极距950—1000m,偶极中心间距5000—8000m。在观测期间发现地电阻率ρ_s无明显季节性变化;在距测区100公里范围内发生M≥4级地震前10天左右,ρ_s出现3—8%的变化。更多还原

【Abstract】 In 1985-1988 at Minle earthquake risk region, Gansu Province, the regular measuring has been carried out by using the method of dipole electrical sounding with current electrode spacing AB=1km, receiver electrode spacing MN=0.95-1 km, central distance of dipole R=5-8 km. The results show: (1)Apparent resistivity ps does not have yearly variation; (2)The ps variation, about 10 days before the M>4.0 earthquakes, is 3-8% in range of 100 km to the observation point.更多还原