Abstract
A magnetotelluric (MT) station was installed in the northern part of Algeria in December 2014 with the aim of investigating any electromagnetic phenomena related to crustal activities. Significant changes in the five channels of the MT signal amplitude were observed during a sequence of minor to light earthquakes that occurred in the vicinity of the MT station. We applied the singular spectral analysis (SSA) method to the recorded magnetotelluric time series in order to discriminate the co-seismic electromagnetic signals. In particular, we investigated the reconstructed components extracted from the telluric and magnetic field components. Based on the obtained results, the co-seismic electric signal can be found in the third reconstructed component for the two electric field components. On the other hand, the three magnetic components do not present the same results after the application of the SSA technique, where the co-seismic magnetic signal can be found in different reconstructed components. In this work, the adopted analysis method has shown its ability to clearly detect co-seismic electromagnetic signals in the magnetotelluric time series. The primary goal of this work is to implement an effective algorithm for detecting clearly co-seismic electromagnetic signals.
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Acknowledgements
We are immensely grateful to the anonymous reviewers for their helpful comments and useful advice, which improved the content and presentation of this paper. This research was conducted with the support of the Research Center of Astronomy, Astrophysics and Geophysics (CRAAG, Algeria). Data collection was carried out using Phoenix Geophysics MTU-A system devices belonging to CRAAG and the Geophysics Laboratory (USTHB/Algiers).
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This work has been supported by the Research Center of Astronomy, Astrophysics and Geophysics (Algeria).
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All the authors contributed to the study. Supervision and data acquisition were ensured by A.B and A.A. The conceptualization was formalized by M.H. The data analysis was performed by A.S. K and A.B. The first draft of the manuscript was written by A.S. K, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Responsible Editor: Narasimman Sundararajan
This paper was selected from the 2nd Conference of the Arabian Journal of Geosciences (CAJG), Tunisia 2019.
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Kasdi, A.S., Bouzid, A., Hamoudi, M. et al. Singular spectral analysis applied to magnetotelluric time series collected at Medea Geomagnetic Observatory (Algeria)—an attempt to discriminate earthquake-related electromagnetic signal. Arab J Geosci 15, 1178 (2022). https://doi.org/10.1007/s12517-022-10438-2
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DOI: https://doi.org/10.1007/s12517-022-10438-2