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1.观测概况从一九六八年开始,甘肃省内先后布设和改建的地电台共有十七个。采用的基本都是四极对称法;供电极距最长为一千五百米,多数在一千米左右;观测仪器大都是DDC—2A型电子自动补偿仪,仅在兰州和临夏两台长期使用精度在万分之五的直流数字电压表;多数
1. Observation Overview Since 1968, there have been 17 ground stations deployed and rebuilt in Gansu Province. The basic method used is the quadrupole symmetry method; the longest electrode distance is 1,500 meters, most of which is about 1,000 meters; most of the observation instruments are DDC-2A electronic automatic compensators. Only in Lanzhou and Linxia Use accuracy of five thousandths of the DC digital voltmeter; majority