9:15 AM - 9:30 AM
[STT58-02] Airborne Geophysical Survey for the Evaluation of Geothermal Potential in Japan
Keywords:airborne geophysical survey, geothermal resources, gravity survey, electromagnetic survey
Airborne Gravity Gradiometry (AGG) method and time domain electromagnetic and magnetic method using a helicopter (HELITEM) are applied in the surveys. AGG survey is suitable for delineating geological structures in detail. HELITEM survey has an advantage over frequency domain electromagnetic survey as it has deeper penetration. A helicopter can fly at lower altitude with lower velocity than a fixed wing, which provides higher resolution and higher signal intensity data. Adopting the helicopter is beneficial especially for topography with steep slopes such as the mountain regions in Japan.
We are studying analysis methodologies for the acquired geophysical data. For example, we tried a variety of filtering to extract structural features such as lineaments from AGG data. Ground truth surveys with outcrop sampling are also conducted to ascertain the analysis results of the airborne geophysical surveys.
We have completed the airborne geophysical surveys in more than 10 areas in Japan, so far. In this presentation, we will introduce results and our experience from the surveys recently acquired.
The authors acknowledge local municipalities and related organizations for their understanding and cooperation with us to conduct the airborne survey.