| Title | GPS and Microgravity Monitoring at Hatchobaru Geothermal Field, Central Kyushu, Japan |
|---|---|
| Authors | J. Nishijima, N. Sakamura, Y. Fujimitsu, S. Ehara, E. Kouno and S. Kusaba |
| Year | 2001 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | Hatchobaru geothermal field is located 5km northwest of Kuju volcano, central Kyushu, and it is a fractured dominated geothermal reservoir. We have conducted GPS and micro-gravity monitoring to detect the ground deformation and mass fluid movement caused by production and reinjection. The horizontal displacement vector is toward the Komatsuike fault, which is located main production zone at approximately 1100m in depth. The results of repeat gravity measurements show this is an effective method to monitor the underground hydrology. |