Ionospheric Anomalies around the Time of the Powerful Nabro’s Eruption Triggered by June 12, 2011 Earthquakes

Enoch Oluwaseun Elemo

Centre for Atmospheric Research, Anyigba, Nigeria.

DOI: 10.4236/oalib.1101396                

Abstract

Ionospheric variability resulting from earthquake events is a known phenomenon as revealed by various seismo-ionospheric coupling studies. Variations resulting from seismo-ionospheric couplings are known to be much weaker, and noted to occur only locally in an area that is specified by the magnitude of the earthquake. Whereas disturbances generated by other sources like geomagnetic storms, exhibit a more global behaviour. For this study, GPS-TEC data of 31 days (15 days before and 15 days after the occurrence of June 12, 2011 earthquakes) were examined. There were 14 earthquakes within 6 hours of that day that triggered the eruption that occurred on the 19th and 20th. This eruption produced the highest level of sulfur dioxide emissions in the earth’s atmosphere that was ever detected from space. Any correlation between the identified TEC anomalies and the earthquakes were examined. The results showed an anomaly which started two days before the earthquakes. There was a consistent decrease in the GPS-TEC two days before the earthquake. The day of the earthquake also witnessed the most anomalous decrease during the days understudy. The 19th day of June 2011 eruptions however reflected in the ionosphere through the decrease in electron concentrations.

Keywords

Ionospheric Variability, Seismo-Ionospheric Couplings, Earthquake, GPS-TEC Data, TEC Anomalies and Eruption

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Park, C.G. and Dejnakarintra, M. (1973) Penetration of Thundercloud Electric Fields into the Ionosphere and Magnetosphere, 1. Middle and Auroral Latitudes. Journal of Geophysical Research, 78, 6623-6633.
[2]	Kim, V.P., Hegai, V.V. and Illich-Svitych, P.V. (1994) On One Possible Ionospheric Precursor of Earthquakes. Physics of the Solid Earth, 30, 223-226.
[3]	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, 1209-1218.
[4]	Molchanov, O., Fedorov, E., Schekotov, A., Gordeev, E., Chebrov, V., Surkov, V., Rozhnoi, A., Andreevsky, S., Iudin, D., Yunga, S., Lutikov, A., Hayakawa, M. and Biagi, P.F. (2004) Lithosphere-Atmosphere-Ionosphere Coupling as Governing Mechanism for Preseismic Short-Term Events in Atmosphere and Ionosphere. Natural Hazards and Earth System Sciences, 4, 757-767. http://dx.doi.org/10.5194/nhess-4-757-2004
[5]	Pulinets, S.A., Khegai, V.V., Boyarchuk, K.A. and Lomonosov, A.M. (1998) The Atmospheric Electric Field as a Source of Variability in the Ionosphere. Physics-Uspekhi, 41, 515-522. http://dx.doi.org/10.1070/PU1998v041n05ABEH000399
[6]	Pulinets, S.A., Liu, J.Y. and Safronova, I.A. (2004) Interpretation of a Statistical Analysis of Variations in the foF2 Critical Frequency before Earthquakes Based on Data from Chung-Li Ionospheric Station (Taiwan). Geomagnetism and Aeronomy, 44, 102-106.
[7]	Pulinets, S.A., Contreras, A.L., Gaivoronska, T.B. and Safronova, I.A. (2004) Ionospheric Day-to-Day Variability and Spatial-Temporal Correlation, IRI Task Force Activity Workshop, ICTP, Trieste.
[8]	Hayakawa, M. and Molchanov, O.A. (2002) Seismo-Electromagnetics: Lithosphere-Atmosphere-Ionosphere Coupling. Terra Scientific Publishing Co., Tokyo, 477 p.
[9]	Namgaladze, A.A., Klimenko, M.V., Klimenko, V.V. and Zakharenkova, I.E. (2009) Physical Mechanism and Mathematical Modelling of Earthquake Ionospheric Precursors Registered in Total Electron Content. Geomagnetism and Aeronomy, 49, 252-262. http://dx.doi.org/10.1134/S0016793209020169
[10]	Parrot, M. (1995) Use of Satellites to Detect Seismo-Electromagnetic Effects. Advances in Space Research, 15, 1337-1347. http://dx.doi.org/10.1016/0273-1177(95)00072-M
[11]	Pulinets, S.A. and Legen’ka, A.D. (2003) Spatial-Temporal Characteristics of the Large Scale Disturbances of Electron Concentration Observed in the F-Region of the Ionosphere before Strong Earthquakes. Cosmic Research, 41, 221-229. http://dx.doi.org/10.1023/A:1024046814173
[12]	Tronin, A., Hayakawa, M. and Molchanov, O.A. (2002) Thermal IR Satellite Data Application for Earthquake Research in Japan and China. Journal of Geodynamics, 33, 519-534. http://dx.doi.org/10.1016/S0264-3707(02)00013-3
[13]	Devi, M., Barbara, A.K., Depueva, A. and Depuev, V. (2008) Preliminary Results of TEC Measurements in Guwahati, India. Advances in Space Research, 42, 753-756. http://dx.doi.org/10.1016/j.asr.2008.01.020
[14]	Zhao, B.Q., Wang, M., Yu, T., Wan, W.X., Lei, J.H., Liu, L.B. and Ning, B.Q. (2008) Is an Unusual Large Enhancement of Ionospheric Electron Density Linked with the 2008 Great Wenchuan Earthquake? Journal of Geophysical Research, 113, 1-6. http://dx.doi.org/10.1029/2008JA013613
[15]	Liu, J.Y., Chuo, Y.J., Shan, S.J., Tsai, Y.B., Chen, Y.I., Pulinets, S.A. and Yu, S.B. (2004) Pre-Earthquake Ionospheric Anomalies Registered by Continuous GPS TEC Measurements. Annals of Geophysics, 22, 1585-1593. http://dx.doi.org/10.5194/angeo-22-1585-2004
[16]	Liu, J.Y., Chen, Y.I. and Chen, C.H. (2009) Seismoionospheric GPS Total Electron Content Anomalies Observed. Before the 12 May 2008 Mw7.9 Wenchuan Earthquake. Journal of Geophysical Research A, 114, Article ID: A04320.
[17]	Liu, L.B., Wan, W.X., Zhang, M.-L., Zhao, B.Q. And Ning, B.Q. (2008) Prestorm Enhancement in NmF2 and Total Electron Content at Low Latitudes. Journal of Geophysical Research, 113, Article ID: A02311. http://dx.doi.org/10.1029/2007JA012832
[18]	Fujinawa, Y. and Takahashi, K. (1990) Emission of Electromagnetic Radiation Preceeding of the Ito Seismic Swarm of 1989. Nature, 347, 376-378. http://dx.doi.org/10.1038/347376a0
[19]	Symonds, R.B., Rose, W.I., Bluth, G.J.S. and Gerlach, T.M. (1994) Volcanic Gas Studies: Methods, Results and Applications. In: Carrol, M.R. and Holloway, J.R., Eds., Volatiles in Magma: Mineral Society of America Reviews in Mineralogy, Vol. 30, 1-66.
[20]	Krider, E.P. and Roble, R.W. (1986) The Earth’s Electrical Environment. National Academy Press, Washington DC.