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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 5 | Copyright

Special issue: Earthquakes precursors and seismic hazard

Nat. Hazards Earth Syst. Sci., 8, 1001-1007, 2008
https://doi.org/10.5194/nhess-8-1001-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  12 Sep 2008

12 Sep 2008

Statistical features of seismoelectric signals prior to M7.4 Guerrero-Oaxaca earthquake (México)

A. Ramírez-Rojas1, E. L. Flores-Márquez2, L. Guzmán-Vargas3, G. Gálvez-Coyt4, L. Telesca5, and F. Angulo-Brown6 A. Ramírez-Rojas et al.
  • 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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