Microearthquake observation was conducted in a geothermal field and hypocenters were determined by the seismic network data, revealing the extent of the geothermal reservoir. Compared with hypocenter distributions in the past, the region of high seismic activity had migrated. This temporal change is due to variations in the amount of re-injection fluid and the elongation of the fracture zone. Microearthquake observation is one of the more practical ways to monitor reservoirs in a geothermal field.

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