Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.102
IF3.102
IF 5-year value: 3.284
IF 5-year
3.284
CiteScore value: 5.1
CiteScore
5.1
SNIP value: 1.37
SNIP1.37
IPP value: 3.21
IPP3.21
SJR value: 1.005
SJR1.005
Scimago H <br class='widget-line-break'>index value: 90
Scimago H
index
90
h5-index value: 42
h5-index42
Volume 5, issue 5
Nat. Hazards Earth Syst. Sci., 5, 711–715, 2005
https://doi.org/10.5194/nhess-5-711-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Seismic hazard evaluation, precursory phenomena and seismo...

Nat. Hazards Earth Syst. Sci., 5, 711–715, 2005
https://doi.org/10.5194/nhess-5-711-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  22 Sep 2005

22 Sep 2005

Possible seismogenic origin of changes in the ULF EM resonant structure observed at Teoloyucan geomagnetic station, Mexico, 1999-2001

A. Kotsarenko1, O. Molchanov2, R. Pérez Enríquez1, J. A. López Cruz-Abeyro1, S. Koshevaya3, V. Grimalsky4, and I. Kremenetsky5 A. Kotsarenko et al.
  • 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.

Publications Copernicus
Download
Citation
Altmetrics