Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America)
In this work, we apply multi-temporal 1D-magnetotelluric (MT) surveys to estimate the space–time variations of the apparent resistivity <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/3/1737 |
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| author | Carlos A. Vargas J. Sebastian Gomez Juan J. Gomez Juan M. Solano Alexander Caneva |
| author_facet | Carlos A. Vargas J. Sebastian Gomez Juan J. Gomez Juan M. Solano Alexander Caneva |
| author_sort | Carlos A. Vargas |
| collection | DOAJ |
| description | In this work, we apply multi-temporal 1D-magnetotelluric (MT) surveys to estimate the space–time variations of the apparent resistivity <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ρ</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula> and correlate these changes with seismic activity in the central part of Colombia (South America). We use the time series of the Earth’s natural electric and magnetic fields registered at two MT stations of the National University of Colombia Seismological Network (RSUNAL), located in the Eastern Andean Cordillera, in the central part of Colombia, over several days. Assuming that large earthquakes may generate these types of anomalies, we identified positive results for the Mesetas earthquake (Mw6.0, Lon = 74.184° W, Lat = 3.462° N, H = 13 km-depth, 24 December 2019, UTC 19:03:55), with anomalies registered eight hours before the mainshock. The depth at which the resistivity anomaly was identified coincides with the depth of the earthquake hypocenter. The origin of these anomalies may be associated with the migration of fluids due to the change in the stress regime before, during, and after the earthquake. We hypothesize that before the occurrence of an earthquake, the stress field generates pore pressure gradients, promoting alterations in fluid migration that change the resistivity of the upper crust. |
| first_indexed | 2024-03-11T09:52:34Z |
| format | Article |
| id | doaj.art-edc85f54b9b94768901aac1d86c63efc |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T09:52:34Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-edc85f54b9b94768901aac1d86c63efc2023-11-16T16:09:42ZengMDPI AGApplied Sciences2076-34172023-01-01133173710.3390/app13031737Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America)Carlos A. Vargas0J. Sebastian Gomez1Juan J. Gomez2Juan M. Solano3Alexander Caneva4Department of Geosciences, Universidad Nacional de Colombia at Bogota, Bogota 111321, ColombiaDepartment of Geosciences, Universidad Nacional de Colombia at Bogota, Bogota 111321, ColombiaDepartment of Geosciences, Universidad Nacional de Colombia at Bogota, Bogota 111321, ColombiaDepartment of Geosciences, Universidad Nacional de Colombia at Bogota, Bogota 111321, ColombiaDepartment of Geosciences, Universidad Nacional de Colombia at Bogota, Bogota 111321, ColombiaIn this work, we apply multi-temporal 1D-magnetotelluric (MT) surveys to estimate the space–time variations of the apparent resistivity <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ρ</mi><mi>a</mi></msub></mrow></semantics></math></inline-formula> and correlate these changes with seismic activity in the central part of Colombia (South America). We use the time series of the Earth’s natural electric and magnetic fields registered at two MT stations of the National University of Colombia Seismological Network (RSUNAL), located in the Eastern Andean Cordillera, in the central part of Colombia, over several days. Assuming that large earthquakes may generate these types of anomalies, we identified positive results for the Mesetas earthquake (Mw6.0, Lon = 74.184° W, Lat = 3.462° N, H = 13 km-depth, 24 December 2019, UTC 19:03:55), with anomalies registered eight hours before the mainshock. The depth at which the resistivity anomaly was identified coincides with the depth of the earthquake hypocenter. The origin of these anomalies may be associated with the migration of fluids due to the change in the stress regime before, during, and after the earthquake. We hypothesize that before the occurrence of an earthquake, the stress field generates pore pressure gradients, promoting alterations in fluid migration that change the resistivity of the upper crust.https://www.mdpi.com/2076-3417/13/3/1737apparent resistivitycorrelationearthquakesmagnetotelluricselectromagnetic signalselectromagnetic anomalies |
| spellingShingle | Carlos A. Vargas J. Sebastian Gomez Juan J. Gomez Juan M. Solano Alexander Caneva Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) Applied Sciences apparent resistivity correlation earthquakes magnetotellurics electromagnetic signals electromagnetic anomalies |
| title | Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) |
| title_full | Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) |
| title_fullStr | Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) |
| title_full_unstemmed | Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) |
| title_short | Space–Time Variations of the Apparent Resistivity Associated with Seismic Activity by Using 1D-Magnetotelluric (MT) Data in the Central Part of Colombia (South America) |
| title_sort | space time variations of the apparent resistivity associated with seismic activity by using 1d magnetotelluric mt data in the central part of colombia south america |
| topic | apparent resistivity correlation earthquakes magnetotellurics electromagnetic signals electromagnetic anomalies |
| url | https://www.mdpi.com/2076-3417/13/3/1737 |
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