Relocation of microearthquakes and relationship between hypocentres and the deep-seated plutonic body in the Kakkonda geothermal field, Northeast Japan
Conference
·
OSTI ID:494384
- Geological Survey of Japan, Tsukuba (Japan)
Relocations of hypocentres of microearthquakes in the Kakkonda geothermal field have been made using new velocity structure models. Relocated hypocentres are distributed along the Kakkonda river. No significant differences are presented among the structure models in the investigated area, but there are a few in the margin of the network. Microearthquakes occur in a highly fractured region as suggested by geological and petrological studies based on well data. Estimated errors by a computer program for determining hypocentres are typically 30 m horizontally but more than 100 m vertically at about 1000 m below sea level where the geothermal reservoir is located. The number of microearthquakes decreases rapidly at 2000 m below sea-level. A conceptual model with probability density and seismic energy distribution is presented to indicate active seismic regions. The model also shows that a contour map of bottom boundary of high seismic energy region is in accord with that of the top level of a neo-granitic pluton body, implying that the occurrence of microearthquakes in Kakkonda geothermal field is controlled by the neo-granitic rocks at depth.
- OSTI ID:
- 494384
- Report Number(s):
- CONF-960913--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Neo-tectonic fracturing after emplacement of quaternary granitic pluton in the Kakkonda geothermal field, Japan
Micro-earthquake monitoring and tri-axial drill-bit VSP in NEDO {open_quotes}Deep-seated geothermal reservoir survey{close_quotes} in Kakkonda, Japan
Petrochemical profiling of the aureole of the Kakkonda granite using cuttings samples along the well Wd-1a, northeast Japan
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:175640
Micro-earthquake monitoring and tri-axial drill-bit VSP in NEDO {open_quotes}Deep-seated geothermal reservoir survey{close_quotes} in Kakkonda, Japan
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:175651
Petrochemical profiling of the aureole of the Kakkonda granite using cuttings samples along the well Wd-1a, northeast Japan
Conference
·
Tue Dec 30 23:00:00 EST 1997
·
OSTI ID:602691