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Statistical features of seismoelectric signals prior to M7.4 Guerrero-Oaxaca earthquake (México)
1Área de Física de Procesos Irreversibles, Universidad Autónoma Metropolitana Azcapotzalco, Avenida San Pablo 180 Colonia Reynosa, Azcapotzalco, 02200, México D. F., México
2Inst. de Geofísica, UNAM, Circuito Exterior S/N, Cd. Universitaria, 04510 México D. F., México
3Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Inst. Politécnico Nacional, 07738, México D. F., México
4Dep. de Matemáticas, Unidad Profesional Interdisciplinaria de Biotecnología del Inst. Politécnico Nacional, Av. Acueducto S/N, Col. Barrio La Laguna Ticomán, C. P. 07340, México D. F., México
5Inst. di Metodologie per l'Analisi Ambientale, Consiglio Nazionale delle Ricerche, C. da S. Loja, 85050 Tito (PZ), Italy
6Dep. de Física, Escuela Superior de Física y Matemáticas, Inst. Politécnico Nacional, Edif. 9, U. P. Zacatenco, 07738, México D. F., México
Abstract. In this paper a statistical analysis of seismoelectric ULF signals prior to the M7.4 Guerrero-Oaxaca earthquake (EQ) occurred at the Mexican Pacific coast on 14 September 1995, has been performed. The signals were simultaneously recorded at three monitoring stations from the last months of 1994 until July of 1996. The nonlinear time series methods of Higuchi fractal dimension (HFD) and detrended fluctuation analysis (DFA) have been used. In the three data sets we found some complex dynamical behaviors that seemingly reflect a relaxation-EQ preparation-main shock-relaxation process. In particular, clear spike-like anomalies in both DFA- and HFD-exponents some months before the main shock are revealed.
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Citation: Ramírez-Rojas, A., Flores-Márquez, E. L., Guzmán-Vargas, L., Gálvez-Coyt, G., Telesca, L., and Angulo-Brown, F.: Statistical features of seismoelectric signals prior to M7.4 Guerrero-Oaxaca earthquake (México), Nat. Hazards Earth Syst. Sci., 8, 1001-1007, 2008. Bibtex EndNote Reference Manager
