- Open Access
A method for representing a geomagnetic total force field in a small region with special attention to discontinuities of data
Earth, Planets and Space volume 58, pages 1519–1523 (2006)
In order to represent the total force field variation in a narrow region as precisely as possible, the calculation process of NOC, which is frequently used in geomagnetic field modeling, was improved. An iterative procedure was introduced to avoid the effect of data missing in some time series. The presented procedures are applied to monthly averaged data of the geomagnetic total force field during 1980–1997 in Japan. Some local changes are detected using this model. One of them may be related to an earthquake that took place near the site.
Burdelnaya, I. A., S. V. Filippov, V. P. Golovkov, S. Fujiwara, T. Tanabe, S. Nishi, M. Kaizu, and S. Matsuzaka, Regional orthogonal models of the geomagnetic field changes over the Far East, Earth Planet Space, 51, 287–296, 1999.
Fainberg, E. B., Separation of the geomagnetic field into a nomal and anomalous part, Geomagnetism and Aeronomy, 15, 144–148, 1975.
Fujiwara, S., T. Tanabe, S. Nishi, S. Matsuzaka, V. P. Golovkov, and S. V. Filippov, Modeling of the geomagnetic total force changes in Japan and the Far East, Proc. Conductivity Anomaly Res., pp. 9–16, 1998 (in Japanese).
Fujiwara, S., T. Nishiki, H. Shirai, H. Hamazaki, and V. P. Golovkov, Modeling the daily mean values of regional geomagnetic total force field changes in Japan, Earth Planet Space, 53, 69–73, 2001.
Geomagnetic Research Group on Earthquake Prediction, Observation of geomagnetic total intensity under the project of earthquake prediction research, Report of the Coordinating Committee for Earthquake Prediction, 9, 109–126, 1973.
Golovkov, V. P. and L. R. Newitt, An evaluation of a regional orthogonal field model for Canada with respect to the Canadian geomagnetic reference field, J. Geomag. Geoelectr., 49, 337–346, 1997.
Goto, T., S. Sakanaka, Y. Hori, Y. Wada, N. Sumitomo, and N. Oshiman, Anomalous changes in the geomagnetic total force associated with the occurrence of the Off-Noto Peninsula Earthquake, Annuals. Disas. Prev. Res. Inst., Kyoto Univ., 37 B-1, 281–291, 1994 (in Japanese with English abstract).
Ishido, T., Electro-kinetic phenomena acompanying with water boiling—mechanisms on electrokinetic precursor for earthquakes, Proc. Conductivity Anomaly Res., 100–105, 1995 (in Japanese).
Kadokura, S., A new method for data analysis of precise observation of geomagnetic secular variation, Proc. Conductivity Anomaly Res., 151–158, 1990, (in Japanese).
Mandea, M. and S. Macmillan, International Geomagnetic Reference Field—the eighth generation, Earth Planet Space, 52, 1119–1124, 2000.
Nagao, T., U. Seiya, Y. Asai, and Y. Kono, Anomalous changes in geoelectric potential preceding four earthquakes in Japan, A Critical Review of VAN, World Scientific, Singapore, pp. 293–300, 1996.
Nishida, Y., Y. Sugisaki, K. Takahashi, M. Utsugi, and H. Oshima, Tectonomagnetic study in the eastern part of Hokkaido, NE Japan: Discrepancy between observed and calculated results, Earth Planet Space, 56, 1049–1058, 2004.
Sakanaka, S., N. Sumitomo, and N. Oshiman, Secular changes in the geomagnetic total force in Hokuriku, Kinki and Chugoku districts, Japan, Annuals. Disas. Prev. Res. Inst., Kyoto Univ., 39 B-1, 273–285, 1996 (in Japanese with English abstract).
Tanabe, T., The continuous observation equipment of geomagnetism installed in the whole country, J. Geograph. Surv. Inst., 87, 4–12, 1997 (in Japanese).
Wessel, P. and W. H. F. Smith, New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79, 579, 1998.
About this article
Cite this article
Yamazaki, K., Oshiman, N. A method for representing a geomagnetic total force field in a small region with special attention to discontinuities of data. Earth Planet Sp 58, 1519–1523 (2006). https://doi.org/10.1186/BF03352652
- Geomagnetic field model
- tectonomagnetic phenomena
- missing value