{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:52:41Z","timestamp":1760241161373,"version":"build-2065373602"},"reference-count":34,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2019,12,15]],"date-time":"2019-12-15T00:00:00Z","timestamp":1576368000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>During past decades, several studies have suggested the existence of possible seismic electric precursors associated with earthquakes of magnitude     M &gt; 7    . However, additional analyses are needed to have more reliable evidence of pattern behavior prior to the occurrence of a big event. In this article we report analyses of self-potential     \u0394 V     records during approximately two years in three electro-seismic stations in Mexico located at Acapulco, Guerrero; Petatl\u00e1n, Guerrero and Pinotepa Nacional, Oaxaca. On 18 April 2014 an      M s  7.2     earthquake occurred near our Petatl\u00e1n station. Our study shows two notable anomalies observed in the behavior of the Fourier power spectrum of     \u0394 V     for ultra low frequency ULF-range, and the transition of the     \u03b1 l    -exponent of the detrended fluctuation analysis of the     \u0394 V     time series from uncorrelated to correlated signals. These anomalies lasted approximately three and a half months before the main shock. We compare this electric pattern with another electric signal we reported associated with an      M s  7.4     that occurred on 14 September 1995 at Guerrero state, Mexico. Our characterization of the anomalies observed in both signals point out similar features that enrich our knowledge about precursory phenomena linked to the occurrence of earthquakes of magnitude     M &gt; 7    .<\/jats:p>","DOI":"10.3390\/e21121225","type":"journal-article","created":{"date-parts":[[2019,12,17]],"date-time":"2019-12-17T02:59:01Z","timestamp":1576551541000},"page":"1225","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Comparative Study of Geoelectric Signals Possibly Associated with the Occurrence of Two Ms &gt; 7 EQs in the South Pacific Coast of Mexico"],"prefix":"10.3390","volume":"21","author":[{"given":"Lev","family":"Guzm\u00e1n-Vargas","sequence":"first","affiliation":[{"name":"Unidad Profesional Interdisciplinaria en Ingenier\u00eda y Tecnolog\u00eda Avanzada, Instituto Polit\u00e9cnico Nacional, Ciudad de M\u00e9xico 07340, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"Carrizales-Velazquez","sequence":"additional","affiliation":[{"name":"Unidad Profesional Interdisciplinaria en Ingenier\u00eda y Tecnolog\u00eda Avanzada, Instituto Polit\u00e9cnico Nacional, Ciudad de M\u00e9xico 07340, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Israel","family":"Reyes-Ram\u00edrez","sequence":"additional","affiliation":[{"name":"Unidad Profesional Interdisciplinaria en Ingenier\u00eda y Tecnolog\u00eda Avanzada, Instituto Polit\u00e9cnico Nacional, Ciudad de M\u00e9xico 07340, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jorge","family":"Fonseca-Campos","sequence":"additional","affiliation":[{"name":"Unidad Profesional Interdisciplinaria en Ingenier\u00eda y Tecnolog\u00eda Avanzada, Instituto Polit\u00e9cnico Nacional, Ciudad de M\u00e9xico 07340, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arturo de la","family":"Rosa-Galindo","sequence":"additional","affiliation":[{"name":"Instituto Tecnol\u00f3gico de Pinotepa, Santiago Pinotepa Nacional C.P. 71600, Oaxaca, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V\u00edctor O.","family":"Quintana-Moreno","sequence":"additional","affiliation":[{"name":"Universidad Tecnol\u00f3gica de la Costa Grande de Guerrero, Petatl\u00e1n 40830, Guerrero, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9 Antonio","family":"Peralta","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Instituto Polit\u00e9cnico Nacional-Escuela Superior de F\u00edsica y Matem\u00e1ticas, Ciudad de M\u00e9xico 07738, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernando","family":"Angulo-Brown","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Instituto Polit\u00e9cnico Nacional-Escuela Superior de F\u00edsica y Matem\u00e1ticas, Ciudad de M\u00e9xico 07738, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1616","DOI":"10.1126\/science.275.5306.1616","article-title":"Earthquakes Cannot Be Predicted","volume":"275","author":"Geller","year":"1997","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1025","DOI":"10.1007\/s10950-018-9757-6","article-title":"On the possible correlation between the Gutenberg-Richter parameters of the frequency-magnitude relationship","volume":"22","year":"2018","journal-title":"J. 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