Skip to main content

Advertisement

You are viewing the new article page. Let us know what you think. Return to old version

Article | Open | Published:

Relation between structure and low-temperature geothermal systems in Fukuoka city, southwestern Japan

Abstract

The Fukuoka area is located in the southwestern part of Japan. The Yokote-Ijiri area, located in the southern part of Fukuoka city, has several low-temperature geothermal systems, including eleven hot springs. From 1996 to 2008, the Fukuoka area was investigated by gravity survey, using Scintrex CG-3 and CG-3M gravimeters, in an attempt to delineate its subsurface structure. The surveys were intended to improve the understanding of the relation between the geothermal systems and the subsurface structure as well as to locate the active faults in the surveyed area, which are responsible for generating large earthquakes. The gravity data were analyzed using integrated gradient interpretation techniques, such as the Horizontal Gradient (HG), Tilt Derivative (TDR), and Euler deconvolution methods. With these techniques, many faults were detected, including the famous Kego fault, which is an active fault in Fukuoka city. A 2-D gravity model was constructed to show the relationship between the faults and the geothermal systems. The results of the present study will hopefully lead to an understanding of the relationships between the interpreted faults and the location of the low-temperature geothermal systems and possibly aid in future geothermal exploration of the area.

References

  1. Cordell, L., Gravimetric expression of graben faulting in Santa Fe Country and the Espanola Basin, New Mexico, in Guidebook to Santa Fe Country, 30th Field Conference, edited by R. V. Ingersoll, New Mexico Geological Survey, pp. 59–64, 1979.

  2. Cordell, L. and V. J. S. Grauch, Mapping basement magnetization zones from aeromagnetic data in the San Juan Basin, New Mexico, in The utility of regional gravity and magnetic anomaly maps, edited by W. J. Hinz, Soc. Explor. Geophys., 181–197, 1985.

  3. Corner, B. and W. A. Wilsher, Structure of the Witwatersrand basin derived from interpretation of the aeromagnetic and gravity data, in Proceedings of exploration ’87, third decennial international conference on geophysical and geochemical exploration for minerals and groundwater, edited by G. D. Garland, Ontario Geol. Survey. Special, 3, 532–546, 1989.

  4. Fairhead, J. D., K. J. Bennet, R. H. Gordon, and D. Huang, Euler: Beyond the ‘Black Box’, 64th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 422–424, 1994.

  5. FitzGerald, D., A. Reid, and P. McInerney, New discrimination techniques for Euler deconvolution, Comput. Geosci., 30, 461–469, 2004.

  6. Fujimitsu, Y., J. Nishijima, Y. Oba, and S. Ehara, Low temperature hydrothermal system in the southern area of Fukuoka city, Japan, Proceedings of the 38th Conference of Société Internationale des Techniques Hydrothermales and the 56th Annual Meeting of the Balneological Society of Japan, Beppu, Japan, 2003.

  7. Geographical Survey Institute, http://www.gsi.go.jp/ENGLISH/, 2008.

  8. Geological Survey Enterprises Association, Kyushu, Fukuoka Jibanzu, Geotechnical data of subsoil in Fukuoka, 1981 (in Japanese).

  9. Geological Survey of Japan (ed.), Gravity CD-ROM of Japan, Digital Geoscience Map P-2, Geological Survey of Japan, 2000.

  10. Hirano, T., J. Nishijima, and Y. Fujimitsu, Estimation of fault structure using densed gravity survey data at Fukuoka city, Geothermal and Volcanological Research Report of Kyushu University, 15, 16–22, 2006.

  11. Huang, D., D. Gubbins, R. A. Clark, and K. A. Whaler, Combined study of Euler’s homogeneity equation for gravity and magnetic field, 57th Conf. & Tech. Exhib., Euro. Assoc., Expl. Geophys, Extended Abstracts, 144, 1995.

  12. Karakida, Y., S. Tomita, S. Shimoyama, and K. Chijiwa, Geology of the Fukuoka district, Quadrangle series, Scale 150000, Fukuoka (14) No. 51, 1–192, 1994 (in Japanese with English abstract).

  13. Klingele, E. E., I. Marson, and H. G. Kahle, Automatic interpretation of gravity gradiometric data in two dimensions: vertical gradient, Geophys. Prospect., 39, 407–434, 1991.

  14. Marson, I. and E. E. Klingele, Advantages of using the vertical gradient of gravity for 3-D interpretation, Geophys., 58(11), 1588–1595, 1993.

  15. Matsushita, H., T. Miki, and A. Yamashita, An overturned structure observed in the southern part of Fukuoka city, The Science reports of the Shimabara Volcano Observatory, the Faculty of Science, Kyushu University, No. 7, 1–8, 1971 (in Japanese with English abstract).

  16. Miller, H. G. and V. Singh, Potential field tilt—a new concept for location potential field sources, J. Appl. Geophys., 32, 213–217, 1994.

  17. Phillips, J. D., Processing and interpretation of aeromagnetic data for the Santa Cruz Basin-Patahonia Mountains area, South-Central Arizona, U. S., Geological Survey Open-File Report 02-98, 1998.

  18. Reid, A. B., Short note, Euler magnetic structural index of a thin bed fault, Geophys., Published electronically, 2003.

  19. Reid, A. B., J. M. Allsop, H. Granser, A. J. Millet, and I. W. Somerton, Magnetic interpretation in three dimensions using Euler deconvolution, Geophys., 55, 80–91, 1990.

  20. Reid, A., D. FitzGerald, and P. McInerney, Euler deconvolution of gravity data, SEG annual meeting, Dallas, 2003.

  21. Talwani, M., J. L. Worzel, and M. Landisman, Rapid gravity computations for two-dimensional bodies with applications to the Mendocino submarine fracture zone, J. Geophys. Res., 64, 49–59, 1959.

  22. Thompson, D. T., EULDPH—A new technique for making computerassisted depth estimates from magnetic data, Geophys., 47, 31–37, 1982.

  23. Warvelle, J., Stratigraphy and geologic time, edited by W. C. Brown Co, 113 pp., 1968.

  24. Wilsher, W. A., A structural interpretation of the Witwatersrand basin through the application of the automated depth algorithms to both gravity and aeromagnetic data, M.Sc. thesis, Univ. of Witwatersrand, 1987.

Download references

Author information

Correspondence to Hakim Saibi.

Rights and permissions

Reprints and Permissions

About this article

Key words

  • Gravity
  • Fukuoka city
  • Kego fault
  • low-temperature geothermal systems
  • structure