|
| | Abstract | | For study of the radioactive waste disposal in Japan, it is important to evaluate a geologic structure, faults and a subsurface saline-water intrusion around coasts. We have been developing an ocean-bottom electromagnetometer, OBEM, and have conducted a preliminary test in the coastal area of Horonobe, the northern Hokkaido. Since we were afraid of the occurrence of motion noise of sensors caused by seawater wave, we developed a low-height OBEM to decrease the resistance for seawater motion, in FY2007. In FY2009, we have improved the OBEM and tested it in laboratory pools and a marine test facility, and then conducted a preliminary measurement test in the shallow-water area of the Horonobe test field. It has yielded good-quality data, apparent resistivity and phase data, in a high frequency band. However, the quality of data was poor in middle and low frequency bands because of the motion noise. A more sufficient acquisition time must be necessary for the improvement of data quality. |
|
|
|
| |
|