Wavelet-based Characterization of Seismicity and Geomagnetic Disturbances in the South Sandwich Microplate Area

Larocca, Patricia Alejandra; Arecco, María Alejandra; Mora, Mauricio M.

doi:10.22201/igeof.00167169p.2021.60.4.2119

Cited by 3 publications

(4 citation statements)

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“…In order to highlight local magnetic variations and isolate them from solar activity, the observatories' paired data were selected, considering the earthquake proximity to the observatory network according to Larocca et al (2021) [20] . Therefore, the differences calculated, referred to as deltas (ΔH) minimized the solar diurnal variation effects.…”

Section: Magnetic Field Data Treatmentmentioning

confidence: 99%

“…Arecco et al (2023) [11] recorded abnormal sea height levels along the Argentine coast and Antarctic bases during the Mw 8.1 earthquake of August 12, 2021 in the Sandwich Islands, recording heights above 1.3 m in the South Georgia Islands. There are numerous studies reporting associations between earthquakes and physical phenomena, such as electromagnetic field variations (Varotsos et al, 2013 [12] ; Hayakawa et al, 2010 [13] ; Takeuchi et al, 2012 [14] ; Gao et al, 2014 [15] ; Zhao et al, 2021 [16] ), anomalous Geomagnetic Field (GMF) records on the earth's surface (Ruiz et al, 2011 [17] ; Takla et al, 2018 [18] ; Arecco et al, 2020 [19] ; Larocca et al, 2021 [20] )…”

Section: Introductionmentioning

confidence: 99%

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Magnetogravimetric study on the Scotia Plate, in the South Atlantic Ocean for the characterization of tsunamis

Alejandra

2024

EAR

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The marine and coastal environments of the Scotia Sea regions in the Southern Atlantic Ocean and Antarctica are vulnerable to the potentially disastrous effects of seismic activity along the Scotia Arc. This paper presents a magnetogravimetric study of the Scotia Plate for tsunami characterization. The influence of earthquakes on the Geomagnetic Field (GMF) is investigated using data from INTERMAGNET network observatories. A tectonic model is evaluated using gravity data from NOAA and seismic refraction data from Lamont-Doherty Earth Observatory. The study also assesses the impact on water level (WL) measured at Intergovernmental Oceanographic Commission (IOC) tide gauge stations. Cross Wavelet Transform (XWT) is applied, and a frequency analysis of the GMF is conducted to identify specific frequencies during seismic events. A 2D tectonic model is constructed for the North Scotia Ridge using gravimetric and seismic data to characterize structural boundaries that may be activated during seismic events. Water level records collected from 6 tide gauge stations in the region are filtered and analyzed to identify tsunamis at each station. The results reveal anomalous frequencies in the frequency analysis of the horizontal component of the GMF during the November 25, 2013 earthquake, with high data correlation from different observatories in the study area for periods of 0.5 and 1 hour. Gravimetric modeling delineates faults activated during seismic activity and edges of structures potentially activated due to the transcurrent and compressional nature of the margin. WL anomalies up to 1.30 m are obtained following earthquakes with a magnitude greater than 8. The propagation speed in the study area averaged 460 km/h, consistent with the expected speed for those depths, except for Puerto Argentino, which exceeded them in 50%.

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Section: Magnetic Field Data Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetogravimetric study on the Scotia Plate, in the South Atlantic Ocean for the characterization of tsunamis

Alejandra

2024

EAR

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“…Por otra parte, Arecco et al [2] detectaron registros de altura del agua en estaciones mareográficas por encima de 1,3 m sobre el nivel de la marea predicha momentos posteriores a sismos mayores a 6.5 Mw. Si bien la costa patagónica muestra una vulnerabilidad relativamente baja a los tsunamis, se han realizado estudios teniendo en cuenta su impacto potencial debido a la alta tasa de ocurrencia de procesos geológicos violentos en las cercanías Dragani et al [3], Larocca et al [4] y Jia et al [5]. La acción conjunta de un tsunami, incluso de baja magnitud, la marea local y otros fenómenos como oscilaciones periódicas debido a las configuraciones costeras en algunas áreas (seiches) u ondas de tormenta, pueden agravar la situación, especialmente en el caso de zonas bajas situadas a pocos metros sobre el nivel del mar Rabinovich [6].…”

Section: Introductionunclassified

GIS Application with 2D program for new faut modelling for tsunamis risk prevention at SE Malvinas Islands

Mora¹,

Arecco²,

Larocca³

2023

Proceedings of the 21th LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leaders

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This paper presents applications of Geoengineering tools such as a Geographic Information System (GIS) and a 2D mathematical modeling program on the Malvinas plateau and the North Scotia ridge. Due to the important tectonic activity at the edges of the Scotia, South American and Sandwich plates with the possibility of producing important variations in sea height or tsunamis, it is very important to characterize the crust in the area for the prevention of economic losses in port areas. In this work, freely accessible geological, geophysical, gravimetric and ocean depth data and a compilation of sedimentary thicknesses from the Institute of Applied Geodesy and Geophysics of the Faculty of Engineering of the University of Buenos Aires were used. From the application of the GIS it was possible to map the areas at risk and calculate the distances between the points of possible ruptures of the crust and the urban centers such as Puerto Argentino or the nearby Antarctic Bases of the region. On the other hand, the application allows to highlight areas of cortical weakness by applying geospatial filters in the frequency domain on gravimetric data and thus expand the areas of prevention. The 2D gravity modeling allowed to locate new zones of weakness, showing their extension and depth in a profile that crosses the North Scotia Ridge.

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“…The study area is located on the Scotia Plate boundaries at the transcurrent and subduction margins of the South Sandwich microplate and the South American plate, and the non-accretionary convergent continental margin between the Scotia and Antarctic plates. There are numerous studies that report relationships between earthquakes and some physical phenomenon such as phenomena that mainly include disturbances such as electromagnetic anomalies associated with earthquakes or the link with ionospheric disturbances and electrophysical properties of the medium, among others [1].…”

Section: Introductionmentioning

confidence: 99%

Brief Report of Possible Anticipation of Earthquakes from Geomagnetic Studies Water Level and Atmospheric Pressure in the South Atlantic

MA¹

2022

Environ Sci Ecol: Curr Res

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This paper presents a brief summary of studies carried out in the southwestern Atlantic, based on the analysis of disturbances in the earth’s Geomagnetic Field (GMF), Water Level (WL) and sea-level Atmospheric Pressure (AP) associated with seismic events. GMF records from observatories of the International Real-time Magnetic Observatory Network (INTERMAGNET), WL records from tide stations of the Intergovernmental Oceanographic Commission (IOC), and hourly AP records from databases of the Global Modeling and Assimilation Office (GMAO) of the National Aeronautics and Space Administration (NASA) have been analyzed in the area under study. A comparative table is presented between the frequencies of the GMF wavelet transform analysis, filtered WL records and variation in the AP grids at sea level before and after the earthquakes. It is possible to observe different degrees of approximation in each of the variables regarding the occurrence of earthquakes. For example, in the case of the CMF, some high-intensity seismic events show anomalous frequencies some hours before the earthquake. On the other hand, the WL filtered by astronomical tide, account for the seismic event along the seacoast with a correspondence between wave amplitude and distance to the nearest ports. AP grids account for a dipole type configuration in the distribution of the pressure difference around the earthquake. On the other hand, the time series of atmospheric pressure at ocean level show a local minimum in a range of hours around the occurrence of the event.

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Wavelet-based Characterization of Seismicity and Geomagnetic Disturbances in the South Sandwich Microplate Area

Cited by 3 publications

References 19 publications

Magnetogravimetric study on the Scotia Plate, in the South Atlantic Ocean for the characterization of tsunamis

Magnetogravimetric study on the Scotia Plate, in the South Atlantic Ocean for the characterization of tsunamis

GIS Application with 2D program for new faut modelling for tsunamis risk prevention at SE Malvinas Islands

Brief Report of Possible Anticipation of Earthquakes from Geomagnetic Studies Water Level and Atmospheric Pressure in the South Atlantic

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