| Volumes and Issues Contents of Issue 5 Special Issue |
www.nat-hazards-earth-syst-sci.net/5/711/2005/
doi:10.5194/nhess-5-711-2005
© Author(s) 2005. This work is licensed
under a Creative Commons License.
Possible seismogenic origin of changes in the ULF EM resonant structure observed at Teoloyucan geomagnetic station, Mexico, 1999-2001
1Centro de Geociencias en Juriquilla, UNAM, Apdo Postal 1-742, Centro Queretaro, Querétaro, C.P. 76001, Mexico
2Institute of the Physics of the Earth, Moscow, Russia
3UAEM, Cuernavaca, Morelos, Mexico
4INAOE, Tonantzintla, P.O.51 & 216, C.P. 72000, Puebla, Pue., Mexico
5Institute of Space Research, Nat. Acad. Sci. and Nat. Space Agency, Ukraine
Abstract. The evolution of the ULF resonant structure observed at Teoloyucan geomagnetic station has been provisionally studied in a possible relation with seismic activity in Mexico in the period 1999-2001. Two resonant lines were observed in the H-component (linear polarization) in the frequency bands fR2=10.2–11.1 mHz and fR2=13.6–14.5 mHz, sometimes accompanied by other harmonics. The source of the observed resonances is possibly related with the geomagnetic location of the station (geomagnetic latitude λ=29.1°) and its proximity to the equatorial electrojet (λ~30°). An enhancement of the carrier frequency of both resonances in the period 1 month–2 weeks was found before the strongest EQs. Also, a depression of the resonant structure just a few days before and a few days after some EQs seems to be correlated with seismic activity.
Full Article (PDF, 2271 KB) Special Issue
Citation: Kotsarenko, A., Molchanov, O., Pérez Enríquez, R., López Cruz-Abeyro, J. A., Koshevaya, S., Grimalsky, V., and Kremenetsky, I.: Possible seismogenic origin of changes in the ULF EM resonant structure observed at Teoloyucan geomagnetic station, Mexico, 1999-2001, Nat. Hazards Earth Syst. Sci., 5, 711-715, doi:10.5194/nhess-5-711-2005, 2005. Bibtex EndNote Reference Manager XML
