Share This Article:

Ionospheric Anomalies before/after the 1960 Agadir Earthquake

Abstract PP. 1-6
DOI: 10.4236/oalib.1101103    1,442 Downloads   1,711 Views  

ABSTRACT

This paper focuses on the ionospheric anomalies observed in the F2 layer at Tortosa in Ebre Observatory (40.8oN, 0.49oE), before and after a seismic event in Morocco (Agadir). The data on optimal frequency of F2 layer (f0F2) were acquired using ground based ionosonde. The median-based statistical technique was applied to the data to examine the possible relationship between the earthquake displacement field and the variation of the f0F2 in the ionosphere. The results point to a variation characterized by absence of f0F2 values over four days before the earthquake and continue for almost three days after the day of earthquake. The diurnal monthly median of the f0F2 values also revealed anomalous which has been considered as supporting evidence for the observed correlation.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Elemo, E. (2014) Ionospheric Anomalies before/after the 1960 Agadir Earthquake. Open Access Library Journal, 1, 1-6. doi: 10.4236/oalib.1101103.

References

[1] Fraser-Smith, A.C., Bernardi, A., McGill, P.R., Ladd, M.E., Helliwell, R.A. and Villard Jr., O.G. (1990) Low-Frequency Magnetic Measurements near the Epicenter of the 7.1 Loma Prieta Earthquake. Geophysical Research Letters, 17, 1465-1468.
http://dx.doi.org/10.1029/GL017i009p01465
[2] Fujinawa, Y., Kumagai, T. and Takahashi, K. (1992) A Study of Anomalous Underground Electric-Field Variations Associated with a Volcanic Eruption. Geophysical Research Letters, 19, 9-12.
http://dx.doi.org/10.1029/91GL02822
[3] Gokhberg, M.B., Morgounov, V.A., Yoshino, T. and Tomizawa, I. (1982) Experimental Measurement of Electromagnetic Emissions Possibly Related to Earthquakes in Japan. Journal of Geophysical Research: Solid Earth (1978-2012), 87, 7824-7828.
http://dx.doi.org/10.1029/JB087iB09p07824
[4] Molchanov, O.A., Kopytenko, Yu.A., Voronov, P.M., Kopytenko, E.A., Matiashvili, T.G. and Bernardi, A. (1992) Results of ULF Magnetic Field Measurements near the Epicenters of the Spitak (Ms = 6.9) and Loma Prieta (Ms = 7.1) Earthquakes: Comparative Analysis. Geophysical Research Letters, 19, 1495-1498.
http://dx.doi.org/10.1029/92GL01152
[5] Hayakawa, M., Yoshino, T. and Morgounov, V.A. (1993) On the Possible Influence of Seismic Activity on the Propagation of Magnetospheric Whistlers at Low Latitudes. Physics of the Earth and Planetary Interiors, 77, 97-108.
http://dx.doi.org/10.1016/0031-9201(93)90036-9
[6] Oike, K. and Ogawa, T. (1986) Electromagnetic Radiations from Shallow Earthquakes Observed in the LF Range. Journal of Geomagnetism and Geoelectricity, 38.
[7] Pulinets, S.A. and Boyarchuk, K.A. (2004) Ionospheric Precursors of Earthquakes. Springer, Berlin, 315 p.
[8] Pulinets, S.A. (1998) Seismic Activity as a Source of the Ionospheric Variability. Advances in Space Research, 22, 903-906.
http://dx.doi.org/10.1016/S0273-1177(98)00121-5
[9] Davies, K. (1990) Ionospheric Radio. Peter Peregrinus Ltd., London.
http://dx.doi.org/10.1049/PBEW031E
[10] Freund, F. (1999) Time-Resolute Study of Charge Generation and Propagation in Igneous Rocks. Journal of Geophysical Research, 104.
[11] Hayakawa, M. (1999) Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes. Terra Scientific Publishing Company, Tokyo.
[12] Pulinets, S.A., Legen’ka, A.D. and Alekeseev, V.A. (1994) Pre-Earthquake Ionospheric Effects and Their Possible Mechanisms, in Dusty and Dirty Plasmas, Noise and Chaos in Space and in Laboratory. Plenum Publishing, New York, 545-557.
http://dx.doi.org/10.1007/978-1-4615-1829-7_46
[13] Molchanov, O.V. and Hayakawa, M. (1998) Sub-Ionospheric VLF Signal Pertubations Possibly Related to the Earthquake. Journal of Geophysical Research: Space Physics (1978-2012), 103, 17489-17504.
http://dx.doi.org/10.1029/98JA00999
[14] Pulinets, S.A., Boyarchuk, K.A., Khegai, V.V., Kim, V.P. and Lomonosov, A.M. (2000) Quasielectrostatic Model of Atmosphere-Thermosphere-Ionosphere Coupling. Advances in Space Research, 26, 1209-1212.
http://dx.doi.org/10.1016/S0273-1177(99)01223-5
[15] Pulinets, S., Kotsarenko, A.N. and Ciraolo, L. (2007) Special Case of Ionospheric Day-to-Day Variability Associated with Earthquake Preparation. Advances in Space Research, 39, 970-977.
http://dx.doi.org/10.1016/j.asr.2006.04.032
[16] Pulinets, S. and Davidenko, D. (2014) Ionospheric Precursors of Earthquakes and Global Electric Circuit. Advances in Space Research, 53, 709-723.
http://dx.doi.org/10.1016/j.asr.2013.12.035
[17] Hei, M.A., Heelis, R.A. and McClure, J.P. (2005) Seasonal and Longitudinal Variation of Large Scale Topside Equatorial Plasma Depletions. Journal of Geophysical Research, 110.
[18] Burke, W.J., Gentile, L.C., Huang, C.Y., Valladares, C.E. and Su, S.Y. (2004) Longitudinal Variability of Equatorial Plasma Bubbles Observed by DMSP and ROCSAT-1. Journal of Geophysical Research, 109.

  
comments powered by Disqus

Copyright © 2019 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.