Articles | Volume 4, issue 5/6
Nat. Hazards Earth Syst. Sci., 4, 703–709, 2004

Special issue: Precursory phenomena, seismic hazard evaluation and seismo-tectonic...

Nat. Hazards Earth Syst. Sci., 4, 703–709, 2004

  15 Nov 2004

15 Nov 2004

Spectral and multifractal study of electroseismic time series associated to the Mw=6.5 earthquake of 24 October 1993 in Mexico

A. Ramírez-Rojas1, A. Muñoz-Diosdado2, C. G. Pavía-Miller1,3, and F. Angulo-Brown3 A. Ramírez-Rojas et al.
  • 1Área de Física de Procesos Irreversibles, Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana Azcapotzalco, 02200, México D. F., México
  • 2Departameno de Matemáticas, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, 07340, México D. F., México
  • 3Departamento de Física, Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Edif. Nº 9, U. P. Zacatenco, 07738, México D.F., México

Abstract. In this work we present a spectral and multifractal study of the electric self-potential fluctuations registered in an electroseismic station located at 100km from the epicenter of an earthquake (EQ) with Mw=6.5 in the Pacific coast of Mexico. Our study suggests that in general the time series analyzed displays a persistent behavior. Our results show an anticorrelation between the spectral exponent β and the width of the multifractal spectrum Δα, when they are calculated during a time interval of five months (four months before the EQ and one month after the EQ). In addition, we also calculate the time evolution of the correlation coefficient finding that it has a very similar behavior that the time evolution of Δα.