Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich
Geomagnetic field and atmospheric pressure disturbances are analyzed on this work, related to seismic events. These are located on the Scotia and Sandwich plate-margins in the South Atlantic Ocean. Near the epicenters are placed the INTERMAGNET geomagnetic observatories: King Edward Point (KEP) on t...
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Asociación Argentina de Geofísicos y Geodestas
2022
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ftuninlaplataojs:oai:revistas.unlp.edu.ar:article/14495 2023-05-15T14:15:35+02:00 Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich Análisis de anomalías del campo geomagnético y de la presión atmosférica vinculadas con actividad sísmica en las placas Scotia y Sandwich Arecco, María Alejandra Larocca, Patricia A. Otero, Lidia A. Mora, Mariana C. Canero, María Florencia 2022-12-13 application/pdf https://revistas.unlp.edu.ar/geoacta/article/view/14495 spa spa Asociación Argentina de Geofísicos y Geodestas https://revistas.unlp.edu.ar/geoacta/article/view/14495/13408 https://revistas.unlp.edu.ar/geoacta/article/view/14495 https://creativecommons.org/licenses/by-nc-sa/4.0 CC-BY-NC-SA Geoacta; Vol. 44 Núm. 1 (2022); 23-34 Geoacta; Bd. 44 Nr. 1 (2022); 23-34 Geoacta; Vol. 44 No. 1 (2022); 23-34 Geoacta; V. 44 N. 1 (2022); 23-34 0326-7237 1852-7744 actividad geomagnética variación de presión atmosférica sismos placas Scotia y Sandwich geomagnetic activity atmospheric pressure earthquakes scotia plate info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftuninlaplataojs 2022-12-15T01:45:13Z Geomagnetic field and atmospheric pressure disturbances are analyzed on this work, related to seismic events. These are located on the Scotia and Sandwich plate-margins in the South Atlantic Ocean. Near the epicenters are placed the INTERMAGNET geomagnetic observatories: King Edward Point (KEP) on the South Georgia’ islands, Orcadas (ORC) on Orcadas’ islands, Argentina Island (AIA) on Antartica and Puerto Argentino (PST) on Malvinas Islands. Geomagnetic field records from the observatories are studied during the previous twenty four hours of the seismic event. As the horizontal geomagnetic component is the most sensitive one to these changes, results in the magnitude selected for the analysis. To avoid the diurnal variation effects on the geomagnetic data, the differences between the horizontal components of two observatories are calculated. It is important to remark that on the period of study severe geomagnetic storms are not registered due to a low Sun activity phase. Analyzing the mentioned differences with the wavelets method it is possible to observe ranges of high energy up to very high frequencies previous to the event; in addition to ± 2 nT magnetic peaks of amplitude on the oscillations and a variable duration when applied a low-pass filter. It is possible to detect abnormal variations on an interval of approximately 3 hours before seismic events for Mw ≥ 6.6. On the other hand, atmospheric pressure grids at the sea level global are analyzed, selected on the seism zone, on periods of two to four hours previous to the event, showing distinctive low and high pressure zones. The data is obtained from the MERRA-2 base. The temporal series makes evident a pressure local minimum few hours before the event due to the sea surface ascent/descent. En este trabajo se analizan perturbaciones del campo magnético terrestre y presión atmosférica a nivel del mar relacionadas con eventos sísmicos. Los mismos están localizados en los márgenes de las placas Scotia y Sándwich, en el Atlántico Sur. Los observatorios ... Article in Journal/Newspaper antartic* South Atlantic Ocean Universidad Nacional de La Plata: Portal del Revistas del UNLP Argentino Argentina Merra ENVELOPE(12.615,12.615,65.816,65.816) Orcadas ENVELOPE(-44.717,-44.717,-60.750,-60.750) King Edward Point ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata: Portal del Revistas del UNLP |
op_collection_id |
ftuninlaplataojs |
language |
Spanish |
topic |
actividad geomagnética variación de presión atmosférica sismos placas Scotia y Sandwich geomagnetic activity atmospheric pressure earthquakes scotia plate |
spellingShingle |
actividad geomagnética variación de presión atmosférica sismos placas Scotia y Sandwich geomagnetic activity atmospheric pressure earthquakes scotia plate Arecco, María Alejandra Larocca, Patricia A. Otero, Lidia A. Mora, Mariana C. Canero, María Florencia Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
topic_facet |
actividad geomagnética variación de presión atmosférica sismos placas Scotia y Sandwich geomagnetic activity atmospheric pressure earthquakes scotia plate |
description |
Geomagnetic field and atmospheric pressure disturbances are analyzed on this work, related to seismic events. These are located on the Scotia and Sandwich plate-margins in the South Atlantic Ocean. Near the epicenters are placed the INTERMAGNET geomagnetic observatories: King Edward Point (KEP) on the South Georgia’ islands, Orcadas (ORC) on Orcadas’ islands, Argentina Island (AIA) on Antartica and Puerto Argentino (PST) on Malvinas Islands. Geomagnetic field records from the observatories are studied during the previous twenty four hours of the seismic event. As the horizontal geomagnetic component is the most sensitive one to these changes, results in the magnitude selected for the analysis. To avoid the diurnal variation effects on the geomagnetic data, the differences between the horizontal components of two observatories are calculated. It is important to remark that on the period of study severe geomagnetic storms are not registered due to a low Sun activity phase. Analyzing the mentioned differences with the wavelets method it is possible to observe ranges of high energy up to very high frequencies previous to the event; in addition to ± 2 nT magnetic peaks of amplitude on the oscillations and a variable duration when applied a low-pass filter. It is possible to detect abnormal variations on an interval of approximately 3 hours before seismic events for Mw ≥ 6.6. On the other hand, atmospheric pressure grids at the sea level global are analyzed, selected on the seism zone, on periods of two to four hours previous to the event, showing distinctive low and high pressure zones. The data is obtained from the MERRA-2 base. The temporal series makes evident a pressure local minimum few hours before the event due to the sea surface ascent/descent. En este trabajo se analizan perturbaciones del campo magnético terrestre y presión atmosférica a nivel del mar relacionadas con eventos sísmicos. Los mismos están localizados en los márgenes de las placas Scotia y Sándwich, en el Atlántico Sur. Los observatorios ... |
format |
Article in Journal/Newspaper |
author |
Arecco, María Alejandra Larocca, Patricia A. Otero, Lidia A. Mora, Mariana C. Canero, María Florencia |
author_facet |
Arecco, María Alejandra Larocca, Patricia A. Otero, Lidia A. Mora, Mariana C. Canero, María Florencia |
author_sort |
Arecco, María Alejandra |
title |
Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
title_short |
Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
title_full |
Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
title_fullStr |
Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
title_full_unstemmed |
Analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the Scotia plates and Sandwich |
title_sort |
analysis of geomagnetic field and atmospheric pressure anomalies associated with seismic activity on the scotia plates and sandwich |
publisher |
Asociación Argentina de Geofísicos y Geodestas |
publishDate |
2022 |
url |
https://revistas.unlp.edu.ar/geoacta/article/view/14495 |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) ENVELOPE(-44.717,-44.717,-60.750,-60.750) ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
geographic |
Argentino Argentina Merra Orcadas King Edward Point |
geographic_facet |
Argentino Argentina Merra Orcadas King Edward Point |
genre |
antartic* South Atlantic Ocean |
genre_facet |
antartic* South Atlantic Ocean |
op_source |
Geoacta; Vol. 44 Núm. 1 (2022); 23-34 Geoacta; Bd. 44 Nr. 1 (2022); 23-34 Geoacta; Vol. 44 No. 1 (2022); 23-34 Geoacta; V. 44 N. 1 (2022); 23-34 0326-7237 1852-7744 |
op_relation |
https://revistas.unlp.edu.ar/geoacta/article/view/14495/13408 https://revistas.unlp.edu.ar/geoacta/article/view/14495 |
op_rights |
https://creativecommons.org/licenses/by-nc-sa/4.0 |
op_rightsnorm |
CC-BY-NC-SA |
_version_ |
1766287923818266624 |