| 摘要 |
<p>PURPOSE:To prevent the lowering of quality of data by a method wherein probing is implemented in duplication by a CSMT method (underground probing using an artificial transmitting source) and MT method (terrestrial magnetism/ current probing) and a data by the MT method is linked among the data of the CSMT method below a frequency area at which a near field effect is generated as border to analyze an underground structure. CONSTITUTION:A measuring wire is installed on an MT-1 measuring device and an electrode is set at both ends of the length of a dipole for measuring an electric field and a magnetic field of a total 10 components. A transmitter GGT-30 is set at a distance 2,500-6,000m therefrom to probe using the dipole electrode. Below a specified frequency (100Hz-50Hz) at which a near field effect by a CSMT method is yielded, probing by an MT method using a natural signal is performed and above a specified frequency at which a near field effect is not yielded, probing by the CSMT method generating an artificial signal from a transmission field GGT-30 is performed. Thus, the underground structure is analyzed from the apparent specific resistance by replacing part of the data obtained by the CSMT method, with frequencies below the frequency at which the near field effect is provided, which the MT data.</p> |
