Abstract
Some microearthquakes that occur in the Korean Peninsula show significant geomagnetic variation when subjected to a specialized principal component analysis, wavelet-based semblance filtering and eigenvalue analysis. In this study, the principal component analysis was used to reconstruct and predict the geomagnetic field based on the past observed magnetic fields, and the reconstructed field was compared with the field observed during the earthquake event. The wavelet-based filtering showed improved results in delineating the earthquake event’s geomagnetic variations from their background field. Finally, the change in the tendency of the eigenvalues was detected by the analysis of three components of the geomagnetic fields during the earthquake event. The basement rock of the Korean Peninsula is known to have a highly resistive electrical structure that makes it possible for small-magnitude earthquakes to generate exaggerated geomagnetic variations. This is the first study reporting the relation between these earthquake events and the geomagnetic variations observed in the Korean Peninsula.
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Bella, F., Biagi, P.F., Caputo, M., Cozzi, E., Della Monica, G., Ermini, A., Plastino, W., and Sgrigna, V., 1998, Field strength variations of LF radio waves prior to earthquakes in central Italy. Physics of The Earth and Planetary Interiors, 105, 279–286.
Cooper, G.R.J., 2009, Wavelet-based semblance filtering. Computers & Geosciences, 35, 1988–1991.
Cooper, G.R.J. and Cowan, D.R., 2008, Comparing time series using wavelet-based semblance analysis. Computers & Geosciences, 34, 95–102.
Enescu, D., 2005, Geomagnetic anomalies — Possible earthquake precursors — linked with 2004 significant seismic activity in Vrancea (Romania). Romania Journal of Physics, 50, 1213–1221.
Enescu, B.D., Enescu, D., and Constantin, A.P., 1999, The use of electromagnetic data for short-term prediction of Vrancea (Romania) earthquake: Preliminary data. Earth planets and space, 51, 1099–1117.
Harada, M., Hattori, K., and Isezaki, N., 2004, Transfer function approach to signal discrimination of ULF geomagnetic data. Physics and Chemistry of the Earth, 29, 409–417.
Hattori, K., Takahashi, I., Yoshino, C., Nagao, T., Liu., J.Y., and Shieh, C.F., 2002, ULF Geomagnetic and Geopotential measurement at Chia-Yi, Taiwan. Journal of Atmospheric Electricity, 22, 217–222.
Hattori, K., Serita, A., Gotoh, K., Yoshino, C., Harada, M., Isezaki, N., and Hayakawa, M., 2004, ULF geomagnetic anomaly associated with 2000 Izu Islands earthquake swarm, Japan. Physics and Chemistry of the Earth, 29, 425–435.
Hayakawa, M., Itoh, T., Hattori, K., and Yumoto, K., 2000, ULF electromagnetic precursors for an earthquake at Biak, Indonesia on February 17, 1996. Geophysical Research Letters, 27, 1531–1534.
Johnston, M.J.S., 1997, Review of electric and magnetic fields accompanying seismic and volcanic activity. Surveys in Geophysics, 18, 441–475.
Johnston, M.J.S., Smith, B.E., Johnson, J.R., and Williams, F.J., 1973, A search for tectonomagnetic effects in California and western Nevada. In: Proceeding of conference on Tectonic Problems of the San Andreas Fault system, Kovach, R.L. and Nur, A. (eds.), 225–239, Stanford University press, 239 p.
Kawate, R., Molchanov, O.A., and Hayakawa, M., 1998, Ultra-lowfrequency magnetic fields during the Guam earthquake of 8 August 1993 and their interpretation. Physics of the Earth and Planetary Interiors, 105, 229–238.
Molchanov, O.A. and Hayakawa, M., 1998, On the generation mechanism of ULF seismogenic electromagnetic emissions. Physics of the Earth and Planetary Interiors, 105, 201–210.
Nordemann, D.J.R., Rigozo, N.R., de Souza Echer, M.P., and Echer, E., 2008, Principal components and iterative regression analysis of geophysical series: Application to Sunspot number (1750-2004). Computers & Geosciences, 34, 1443–1453.
Oh, S., Yang, J.-M., Lee, D.K., Kwon, B.-D., Chung, S.-H., Song, Y., Min, K.D., Nakada, M., Mogi, T., and Lee, H., 2006, Deep geoelectrical structure in and around the southern Korean Peninsula by GDS study. Geosciences Journal, 10, 479–490.
Park, S.K., Johnston, M.J.S., Madden, T.R., Morgan, F.D., and Morrison, H.F., 1993, Electromagnetic precursors to earthquakes in the ULF band: A review of observations and mechanisms. Review of Geophysics, 31, 117–132.
Rikitake, T. and Honkura, Y., 1985, Solid earth geomagnetism. Springer, London, 385 p.
Varotsos, P.A. and Alexopoulos, K., 1984, Physical properties of the variations of the electric field of the earth preceding earthquakes. Tectonophysics, 110, 73–98.
Varotsos, P.A., Sarlis, N.V., and Skordas, E.S., 2003a, Electric fields that “arrive” before the time-derivative of the magnetic field prior to major earthquakes. Physical Review Letters, 91, 148–501.
Varotsos, P.A., Sarlis, N.V., and Skordas, E.S., 2003b, Attempt to distinguish electric signals of a dichotomous nature. Physical Review E 68, 031106.
Varotsos, P.A., Sarlis, N.V., Skordas, E.S., Tanaka, H.K., and Lazaridou, M.S., 2006, Entropy of seismic electric signals: Analysis in natural time under time reversal. Physical Review E, 73, 031114.
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Oh, S. Geomagnetic variation and its relation to microearthquakes in the seismically inactive Korean Peninsula. Geosci J 16, 47–58 (2012). https://doi.org/10.1007/s12303-012-0001-z
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DOI: https://doi.org/10.1007/s12303-012-0001-z