ULF geomagnetic anomalies of possible seismogenic origin observed at Teoloyucan station, México, in 1999–2001: Intermediate and short-time analysis

Kotsarenko, A.; Pérez-Enríquez, R.; Cruz-Abeyro, J. A. López; Koshevaya, S.; Grimalsky, V.; Yutsis, Vsevolod; Kremenetsky, I.A.

doi:10.1016/j.tecto.2006.05.036

Cited by 11 publications

(11 citation statements)

References 21 publications

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“…In addition, many authors perform the signal processing in a wide frequency ranges reporting geomagnetic perturbations related to EQs. Such anomalies have been reported for several decades (Parrot and Johnston, 1989;Johnston, 1997;Kushwah et al, 2009;Telesca and Hattori, 2007;Telesca et al, 2008). Seismogenic phenomena in the ULF (ultra low frequency) range, with frequency from 0.005 to 1 Hz (Kopytenko et al, 1993) related with EQs has been studied since Fraser-Smith et al (1990) and a number of papers have been published on this topic after that Serita et al, 2005; Correspondence to: O. Chavez (omar.chavez@uaq.mx) Kushwah et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Detection of electromagnetic anomalies of three earthquakes in Mexico with an improved statistical method

Chavez¹,

Pérez-Enríquez²,

Cruz-Abeyro³

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract.A method for detecting seismomagnetic signals is presented. This work presents evidence of geomagnetic perturbations associated with three earthquakes (EQs) that occurred in Mexico within a distance of ρ = (1.8) 10 0.45M , where M is the magnitude of the EQ, during the year 2010. An improved statistical analysis in relation with the polarization analysis (as the ratio of vertical magnetic field component to the horizontal one) has been developed. The variation index (S 4 ) shows important differences one day before and one day after the EQs (magnitudes considered are from 6 to 7.2).

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Section: Introductionmentioning

confidence: 99%

Detection of electromagnetic anomalies of three earthquakes in Mexico with an improved statistical method

Chavez¹,

Pérez-Enríquez²,

Cruz-Abeyro³

et al. 2011

Nat. Hazards Earth Syst. Sci.

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“…Therefore, a key issue of a study of ULF anomalies is to discriminate signals related to EQs from signals of other origin. Different methods have been proposed to solve this problem, such as the polarization analysis of EM waves (Kawate et al, 1998;Kotsarenko et al, 2004Kotsarenko et al, , 2005Hayakawa et al, 2008); fractal and multi-fractal analysis (Hayakawa et al, 1999;Gotoh et al, 2003;Smirnova et al, 2004;Kotsarenko et al, 2004Kotsarenko et al, , 2005Kotsarenko et al, , 2007; the Principal Component Analysis (PCA) Kotsarenko et al, 2005); location of the area of seismogenic geomagnetic disturbances Kopytenko et al, 2001); and signal/noise discrimination by using the transfer functions , among others. All the abovementioned methods are applied to improve the detection of the ULF signals associated with seismogenic phenomena at different frequencies , and to the understanding of electromagnetic phenomena associated with tectonic and volcanic activity.…”

Section: Introductionmentioning

confidence: 99%

Detection of ULF geomagnetic signals associated with seismic events in Central Mexico using Discrete Wavelet Transform

Chavez¹,

Millán-Almaraz²,

Pérez-Enríquez³

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract.The geomagnetic observatory of Juriquilla Mexico, located at longitude -100.45 • and latitude 20.70 • , and 1946 m a.s.l., has been operational since June 2004 compiling geomagnetic field measurements with a three component fluxgate magnetometer. In this paper, the results of the analysis of these measurements in relation to important seismic activity in the period of 2007 to 2009 are presented. For this purpose, we used superposed epochs of Discrete Wavelet Transform of filtered signals for the three components of the geomagnetic field during relative seismic calm, and it was compared with seismic events of magnitudes greater than M s > 5.5, which have occurred in Mexico. The analysed epochs consisted of 18 h of observations for a dataset corresponding to 18 different earthquakes (EQs). The time series were processed for a period of 9 h prior to and 9 h after each seismic event. This data processing was compared with the same number of observations during a seismic calm. The proposed methodology proved to be an efficient tool to detect signals associated with seismic activity, especially when the seismic events occur in a distance (D) from the observatory to the EQ, such that the ratio D/ρ < 1.8 where ρ is the earthquake radius preparation zone. The methodology presented herein shows important anomalies in the Ultra Low Frequency Range (ULF; 0.005-1 Hz), primarily for 0.25 to 0.5 Hz. Furthermore, the time variance (σ 2 ) increases prior to, during and after the seismic event in relation to the coefficient D1 obtained, principally in the Bx (N-S) and By (E-W) geomagnetic components. Therefore, this paper proposes and develops a new methodology to extract the abnormal signals of the geomagnetic anomalies related to different stages of the EQs.

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“…Recently, generation of the seismo-related Ultra Low Frequency (ULF, 0.1-10 Hz) magnetic perturbations, locally generated geomagnetic pulsations, changes in regular resonant structures were confirmed experimentally by different ground-based observations (Kotsarenko et al, 2004(Kotsarenko et al, , 2007. In order to give a possible explanation we link mentioned phenomena with a modification of the parameters of the ionosphere (such as electron density and the temperature), which is regularly detected during satellite observations over earthquake preparation areas (Gousheva et al, 2008;Sarkar et al, 2007).…”

Section: Introductionmentioning

confidence: 74%

On the modulation of intensity of Alfvén resonances before earthquakes: Observations and model

Grimalsky

Kotsarenko

Пулинец

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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ULF geomagnetic anomalies of possible seismogenic origin observed at Teoloyucan station, México, in 1999–2001: Intermediate and short-time analysis

Cited by 11 publications

References 21 publications

Detection of electromagnetic anomalies of three earthquakes in Mexico with an improved statistical method

Detection of electromagnetic anomalies of three earthquakes in Mexico with an improved statistical method

Detection of ULF geomagnetic signals associated with seismic events in Central Mexico using Discrete Wavelet Transform

On the modulation of intensity of Alfvén resonances before earthquakes: Observations and model

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