Fractal characteristics of the ULF emissions along a meridian profile, based on the 210 MM stations data
- 46 Downloads
Fractal analysis of magnetic records (1 Hz sampling rate) of 5 stations (Guam, Moshiri, Paratunka, Magadan, and Chokurdakh) located along the 210 magnetic meridian (210 MM) has been performed using the Higuchi method. The period of 22 months (October 1992 to July 1994) that embodies the date of the strong Guam earthquake of 8 August1993 has been considered. A comparison of the ULF emissions scaling parameters (spectral exponents β and fractal dimensions D) obtained at different latitudes has been made. Dependence of β and D on the Kp index of geomagnetic activity has been analyzed for each of the 24 local time intervals. It is revealed that D decreases ( β increases) with increasing geomagnetic activity at all stations, but the rates of decrease (increase) are different at different stations and in different time intervals. It is shown that the evening, night and early morning hours are preferable to study magnetospheric effects, whereas the noon hours are the most suitable for the analysis of lithospheric effects. A possibility of using the data of the 210 MM stations as reference materials for the Guam seismically active area is discussed.
Key wordsULF emissions fractal analysis 210 MM SOC dynamics
Unable to display preview. Download preview PDF.
- Bak, P. (1997), How Nature Works, Oxford University Press, Oxford, 210 pp.Google Scholar
- Feder, J. (1988), Fractals, Plenum Press, New York, 283 pp.Google Scholar
- Gotoh, K., M. Hayakawa, N.A. Smirnova, and K. Hattori (2004), Fractal analysis of seismogenic ULF emissions, Phys. Chem. Earth 29,4–9, 419–424, DOI: 10.1016/j.pce.2003.11.013.Google Scholar
- Hayakawa, M. (ed.) (1999), Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes, Proc. Int. Workshop on Seismo-Electromagnetics of NASDA (IWSE1997), 2–5 March 1997, Chofu Tokyo, TERRAPUB, Tokyo.Google Scholar
- Hayakawa, M. (ed.) (2005), Programme and Extended Abstracts of International Workshop on Seismo-Electromagnetics (IWSE2005), 15–17 March 2005, Chofu Tokyo. Hayakawa, M., and O.A. Molchanov (eds.) (2002), Seismo Electromagnetics: Lithosphere-Atmosphere-Ionosphere Coupling, Proc. Int. Workshop on Seismo-Electromagnetics of NASDA (IWSO2000), 19–22 September 2000, Chofu Tokyo, TERRAPUB, Tokyo, 478 pp.Google Scholar
- Hergarten, S. (2002), Self-Organized Criticality in Earth Systems, Springer-Verlag, Berlin Heidelberg, 272 pp.Google Scholar
- Jensen, H.J. (1998), Self-Organized Criticality: Emergent Complex Behavior in Physical and Biological Systems, Cambridge Lecture Notes in Physics, Vol. 10, Cambridge University Press, Cambridge, 153 pp.Google Scholar
- Smirnova, N., M. Hayakawa, and K. Gotoh (2004), Precursory behavior of fractal characteristics of the ULF electromagnetic fields in seismic active zones before strong earthquakes, Phys. Chem. Earth 29,4–9, 445–451, DOI: 10.1016/j.pce.2003.11.016.Google Scholar
- Turcotte, D.L. (1997), Fractals and Chaos in Geology and Geophysics, 2nd ed., Cambridge University Press, Cambridge, 398 pp.Google Scholar
- Vallianatos, F., V. Lapenna, V. Troyan, N. Smirnova, Yu. Kopytenko, V. Korepanov, and T. Matiashvili (2002), Study of the ULF electromagnetic phenomena related to earthquakes: Strategy of the SUPRE project. In: M. Hayakawa and O. Molchanov (eds.), Seismo Electromagnetics: Lithosphere-Atmosphere-Ionosphere Coupling, Proc. Int. Workshop on Seismo-Electromagnetics of NASDA 2000, TERRAPUB, Tokyo, 437–442.Google Scholar
- Yumoto, K., Y. Tanaka, T. Oguti, K. Shiokawa, Y. Yoshimura, A. Isono, B.J. Fraser, F.W. Menk, J.W. Lynn, M. Seto, and the 210 MM Magnetic Observation Group (1992), Globally coordinated magnetic observations along 210° magnetic meridian during STEP period: 1. Preliminary results of lowlatitude Pc 3’s, J. Geomag. Geoelectr. 44,4, 261–276, DOI: 10.5636/jgg.44.261.CrossRefGoogle Scholar