An analysis between the hourly distribution of
earthquakes in three areas of the Caribbean and the high-frequency variations
of the geomagnetic field is presented. The number of earthquakes selected for
each zone is between 10,000 and 43,000, which guarantees a statistically
significant distribution. The hourly distributions of seismicity in all areas
show a bay-shape distribution with a significant increase in the number of
earthquakes at night, from 11 PM to 5 AM. For example, in eastern Cuba 36.7% of
earthquakes occur at that time, representing 11.7% over 25% in the absence of
any time preference. Geomagnetic disturbances were compiled from several years
to be able to make a statistically significant hourly distribution of their
occurrence, being determined by sudden changes in the magnetic field at a short
period of 1 minute. In this sense, geomagnetic data were processed between the
years 2011-2016, recorded by the geostationary satellite GOES13 and the
magnetic ground station SJG in San Juan, Puerto Rico. The result shows a significant correlation between hourly earthquakes
distribution and high-frequency geomagnetic variations. The time-varying
conductivity response of Earth’s interior also correlates with seismicity. The
theory behind this correlation could be related to the piezoelectric phenomena
and the electromagnetic force induced when the magnetic field is disturbed.
References
[1]
Gao, Y., Chen, X., Hu, H., Wen, J., Tang, J. and Fang, G. (2014) Induced Electromagnetic Field by Seismic Waves in Earth’s Magnetic Field. Journal of Geophysical Research: Solid Earth, 119, 5651-5685. https://doi.org/10.1002/2014JB010962
[2]
Marchetti, D., De Santis, A., Jin, S., Campuzano, S.A., Cianchini, G. and Piscini, A. (2020) Co-Seismic Magnetic Field Perturbations Detected by Swarm Three-Satellite Constellation. Remote Sensing, 12, 1-21. https://doi.org/10.3390/rs12071166
[3]
Sorokin, V.M., Chmyrev, V.M. and Hayakawa, M. (2020) A Review on Electrodynamic Influence of Atmospheric Processes to the Ionosphere. Open Journal of Earthquake Research, 9, 113-141. https://doi.org/10.4236/ojer.2020.92008
[4]
Enomoto, Y., Heki, K., Yamabe, T., Sugiura, S. and Kondo, H. (2020) A Possible Causal Mechanism of Geomagnetic Variations as Observed Immediately before and after the 2011 Tohoku-Oki Earthquake. Open Journal of Earthquake Research, 9, 33-49. https://doi.org/10.4236/ojer.2020.92003
[5]
Lei, Y., Jiao, L. and Chen, H. (2018) Possible Correlation between the Vertical Component of Lithospheric Magnetic Field and Continental Seismicity. Earth, Planets and Space, 70, Article No. 179. https://doi.org/10.1186/s40623-018-0949-7
[6]
Klein, F.W. (1976) Earthquake Swarms and the Semidiurnal Solid Earth Tide. Geophysical Journal International, 45, 245-295. https://doi.org/10.1111/j.1365-246X.1976.tb00326.x
[7]
Métivier, L., de Viron, O., Conrad, C.P., Renault, S., Diament, M. and Patau, G. (2009) Evidence of Earthquake Triggering by the Solid Earth Tides. Earth and Planetary Science Letters, 278, 370-375. https://doi.org/10.1016/j.epsl.2008.12.024
[8]
Chen, L., Chen, J.G. and Xu, Q.H. (2012) Correlations between Solid Tides and Worldwide Earthquakes Ms ≥ 7.0 since 1900. Natural Hazards and Earth System Sciences, 12, 587-590. https://doi.org/10.5194/nhess-12-587-2012
[9]
Vidale, J.E., Agnew, D.C., Johnston, M.J.S. and Oppenheimer, D.H. (1998) Absence of Earthquake Correlation with Earth Tides: An Indication of High Preseismic Fault Stress Rate. Journal of Geophysical Research: Solid Earth, 103, 24567-24572. https://doi.org/10.1029/98JB00594
[10]
Duma, G. and Vilardo, G. (1998) Seismicity Cycles in the Mt. Vesuvius Area and their Relation to Solar Flux and the Variations of the Earth’s Magnetic Field. Physics and Chemistry of the Earth, 23, 927-931. https://doi.org/10.1016/S0079-1946(98)00121-9
[11]
Markson, R. (1978) Solar Modulation of Atmospheric Electrification and Possible Implications for the Sun-Weather Relationship. Nature, 273, 103-109. https://doi.org/10.1038/273103a0
[12]
Rycroft, M.J., Israelsson, S. and Price, C. (2000) The Global Atmospheric Electric Circuit, Solar Activity and Climate Change. Journal of Atmospheric and Solar-Terrestrial Physics, 62, 1563-1576. https://doi.org/10.1016/S1364-6826(00)00112-7
[13]
Urata, N., Duma, G. and Freund, F. (2018) Geomagnetic Kp Index and Earthquakes. Open Journal of Earthquake Research, 7, 39-52. https://doi.org/10.4236/ojer.2018.71003
[14]
Eccles, D., Sammonds, P.R. and Clint, O.C. (2005) Laboratory Studies of Electrical Potential during Rock Failure. International Journal of Rock Mechanics & Mining Sciences, 42, 933-949. https://doi.org/10.1016/j.ijrmms.2005.05.018
[15]
Fujii, I. and Schultz, A. (2002) The 3D Electromagnetic Response of the Earth to Ring Current and Auroral Oval Excitation. Geophysical Journal International, 151, 689-709. https://doi.org/10.1046/j.1365-246X.2002.01775.x
[16]
Tsuruoka, H., Ohtake, M. and Sato, H. (1995) Statistical Test of the Tidal Triggering of Earthquakes—Contribution of the Ocean Tide Loading Effect. Geophysical Journal International, 122, 183-194. https://doi.org/10.1111/j.1365-246X.1995.tb03546.x
[17]
Cochran, E.S., Vidale, J.E. and Tanaka, S. (2004) Earth Tides Can Trigger Shallow Thrust Fault Earthquakes. Science, 306, 1164-1166. https://doi.org/10.1126/science.1103961
[18]
Haydon, D.A. (1964) The Electrical Double Layer and Electrokinetic Phenomena. In: Danielli, J. F., Pankhurst, K.G.A., Riddiford, A.C., Eds., Recent Progress in Surface Science, Vol. 1, Elsevier, New York, 94-158. https://doi.org/10.1016/B978-1-4831-9995-5.50008-X
[19]
Mizutani, H., Ishida, T., Yokokura, T. and Ohnishi, S. (1976) Electrokinetic Phenomena Associated with Earthquakes. Geophysical Research Letters, 3, 365-368. https://doi.org/10.1029/GL003i007p00365
[20]
Johnston, M.J.S. (2002) Electromagnetic Fields Generated by Earthquakes. In: Lee, W., Jennings, P., Kisslinger, C., Kanamori, H., Eds., International Handbook of Earthquake and Engineering Seismology Part A, Vol. 81, Elsevier, San Diego, 621-635. https://doi.org/10.1016/S0074-6142(02)80241-8
