Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean
This paper is aimed at studying disturbances in the earth’s geomagnetic field (GMF), water level (WL) and sea-level atmospheric pressure (AP) associated with Mw≥ 6.6 seismic events in the in the Scotia arch, in the South Atlantic. GMF records from observatories of the International Magnetic Observat...
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Universidad Nacional Autónoma de México, Instituto de Geofísica
2023
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Online Access: | https://doi.org/10.22201/igeof.2954436xe.2023.62.3.1440 https://doaj.org/article/54055e1efdfd4b99929037f3eafc40a0 |
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ftdoajarticles:oai:doaj.org/article:54055e1efdfd4b99929037f3eafc40a0 2023-07-30T04:06:51+02:00 Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean María Alejandra Arecco Patricia Alejandra Larocca Fernando Ariel Oreiro Mónica María Elisa Fiore Lidia Ana Otero María Florencia 2023-07-01T00:00:00Z https://doi.org/10.22201/igeof.2954436xe.2023.62.3.1440 https://doaj.org/article/54055e1efdfd4b99929037f3eafc40a0 EN ES eng spa Universidad Nacional Autónoma de México, Instituto de Geofísica http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1440 https://doaj.org/toc/0016-7169 https://doaj.org/toc/2954-436X 0016-7169 2954-436X doi:10.22201/igeof.2954436xe.2023.62.3.1440 https://doaj.org/article/54055e1efdfd4b99929037f3eafc40a0 Geofísica Internacional, Vol 62, Iss 3, Pp 543-561 (2023) earthquakes atmospheric pressure tsunami horizontal component of the geomagnetic field sunspots Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.22201/igeof.2954436xe.2023.62.3.1440 2023-07-09T00:35:28Z This paper is aimed at studying disturbances in the earth’s geomagnetic field (GMF), water level (WL) and sea-level atmospheric pressure (AP) associated with Mw≥ 6.6 seismic events in the in the Scotia arch, in the South Atlantic. GMF records from observatories of the International Magnetic Observatory Network (INTERMAGNET), WL records from tide stations of the Intergovernmental Oceanographic Commission, and hourly AP records from databases of the Global Modeling and Assimilation Office of the National Aeronautics and Space Administration have been analyzed in the area under study. For the analysis of geomagnetic disturbances, the GMF horizontal component (H), which is more susceptible to variations, was considered. For the WL analysis, the discrepancy (residue) between the WL time series from tide stations and the predicted level of astronomical tides, for a 10-day period before and after the occurrence of each earthquake, was calculated. For the AP analysis, the variation of data gridded between 1 and 2 hours before and after the earthquake was calculated. The analysis of the geomagnetic data prior to the seismic event, using a high-pass filter and the wavelet method, showed: a) high energy ranges in all frequencies, even in very high ones; and b) oscillations in the filter with amplitude peaks of ± 0.2 nT, and with an anticipation and duration consistent with the wavelet method. As regards the WL residues calculated, there were oscillations in the largest amplitudes in the sensors located closest to the earthquake, thus, those large amplitudes corresponded to shorter times of arrival. The AP study showed a maximum followed by a local minimum within a range of ± 0.3 hPa around the location of the earthquake. While the GMF analysis anticipated seismic events within a range of 6-2 hours, the techniques used for WL and AP could detect Mw>7 earthquakes, associating them with the rising/falling surface of the sea. These three techniques can be used jointly to implement a prevention or early warning system for ... Article in Journal/Newspaper South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Geofísica Internacional 62 3 543 561 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish |
topic |
earthquakes atmospheric pressure tsunami horizontal component of the geomagnetic field sunspots Geophysics. Cosmic physics QC801-809 |
spellingShingle |
earthquakes atmospheric pressure tsunami horizontal component of the geomagnetic field sunspots Geophysics. Cosmic physics QC801-809 María Alejandra Arecco Patricia Alejandra Larocca Fernando Ariel Oreiro Mónica María Elisa Fiore Lidia Ana Otero María Florencia Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
topic_facet |
earthquakes atmospheric pressure tsunami horizontal component of the geomagnetic field sunspots Geophysics. Cosmic physics QC801-809 |
description |
This paper is aimed at studying disturbances in the earth’s geomagnetic field (GMF), water level (WL) and sea-level atmospheric pressure (AP) associated with Mw≥ 6.6 seismic events in the in the Scotia arch, in the South Atlantic. GMF records from observatories of the International Magnetic Observatory Network (INTERMAGNET), WL records from tide stations of the Intergovernmental Oceanographic Commission, and hourly AP records from databases of the Global Modeling and Assimilation Office of the National Aeronautics and Space Administration have been analyzed in the area under study. For the analysis of geomagnetic disturbances, the GMF horizontal component (H), which is more susceptible to variations, was considered. For the WL analysis, the discrepancy (residue) between the WL time series from tide stations and the predicted level of astronomical tides, for a 10-day period before and after the occurrence of each earthquake, was calculated. For the AP analysis, the variation of data gridded between 1 and 2 hours before and after the earthquake was calculated. The analysis of the geomagnetic data prior to the seismic event, using a high-pass filter and the wavelet method, showed: a) high energy ranges in all frequencies, even in very high ones; and b) oscillations in the filter with amplitude peaks of ± 0.2 nT, and with an anticipation and duration consistent with the wavelet method. As regards the WL residues calculated, there were oscillations in the largest amplitudes in the sensors located closest to the earthquake, thus, those large amplitudes corresponded to shorter times of arrival. The AP study showed a maximum followed by a local minimum within a range of ± 0.3 hPa around the location of the earthquake. While the GMF analysis anticipated seismic events within a range of 6-2 hours, the techniques used for WL and AP could detect Mw>7 earthquakes, associating them with the rising/falling surface of the sea. These three techniques can be used jointly to implement a prevention or early warning system for ... |
format |
Article in Journal/Newspaper |
author |
María Alejandra Arecco Patricia Alejandra Larocca Fernando Ariel Oreiro Mónica María Elisa Fiore Lidia Ana Otero María Florencia |
author_facet |
María Alejandra Arecco Patricia Alejandra Larocca Fernando Ariel Oreiro Mónica María Elisa Fiore Lidia Ana Otero María Florencia |
author_sort |
María Alejandra Arecco |
title |
Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
title_short |
Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
title_full |
Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
title_fullStr |
Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
title_full_unstemmed |
Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean |
title_sort |
disturbances in the geomagnetic field, water level and atmospheric pressure associated with mw ≥ 6.6 earthquakes in the south atlantic ocean |
publisher |
Universidad Nacional Autónoma de México, Instituto de Geofísica |
publishDate |
2023 |
url |
https://doi.org/10.22201/igeof.2954436xe.2023.62.3.1440 https://doaj.org/article/54055e1efdfd4b99929037f3eafc40a0 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Geofísica Internacional, Vol 62, Iss 3, Pp 543-561 (2023) |
op_relation |
http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1440 https://doaj.org/toc/0016-7169 https://doaj.org/toc/2954-436X 0016-7169 2954-436X doi:10.22201/igeof.2954436xe.2023.62.3.1440 https://doaj.org/article/54055e1efdfd4b99929037f3eafc40a0 |
op_doi |
https://doi.org/10.22201/igeof.2954436xe.2023.62.3.1440 |
container_title |
Geofísica Internacional |
container_volume |
62 |
container_issue |
3 |
container_start_page |
543 |
op_container_end_page |
561 |
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1772819784313864192 |