| Volumes and Issues Contents of Issue 5/6 Special Issue |
www.nat-hazards-earth-syst-sci.net/4/679/2004/
© Author(s) 2004. This work is licensed
under a Creative Commons License.
Analysis of the ULF electromagnetic emission related to seismic activity, Teoloyucan geomagnetic station, 1998-2001
1Centro de Geociencias, Juriquilla, UNAM, Apdo Postal 1-742, Centro Queretaro, Querétaro, Mexico, C.P. 76001, Mexico
2UAEM, Cuernavaca, Morelos, Mexico
3INAOE, Tonantzintla, Puebla, Mexico
Abstract. Results of ULF geomagnetic measurements at station Teoloyucan (Central Mexico, 99.11'35.735''W, 19.44'45.100''N, 2280m height) in relation to seismic activity in the period 1998-2001 and their analysis are presented. Variations of spectral densities for horizontal and vertical components, polarization densities and spectrograms of magnetic field, their derivatives are analyzed as a part of traditional analysis in this study. Values of spectral density were calculated for 6 fixed frequencies f=1, 3, 10, 30, 100 and 300mHz. Fractal characteristics of spectra were analyzed in the conception of SOC (Self-Organized Criticality). 2 nighttime intervals, 0-3 and 3-6h by local time have been used to decrease the noise interference in row data. In order to exclude the intervals with a high geomagnetic activity from analysis we referred to Ap indices, calculated for corresponding time intervals. The contribution of seismic events to geomagnetic emission was estimated by seismic index ks=100.75Ms/10D, where Ms is the amplitude of the earthquake and D is the distance from its epicenter to the station.
Full Article (PDF, 1798 KB)
Citation: Kotsarenko, A., Pérez Enríquez, R., López Cruz-Abeyro, J. A., Koshevaya, S., Grimalsky, V., and Zúñiga, F. R.: Analysis of the ULF electromagnetic emission related to seismic activity, Teoloyucan geomagnetic station, 1998-2001, Nat. Hazards Earth Syst. Sci., 4, 679-684, 2004. Bibtex EndNote Reference Manager
