Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean

• DOI: 10.22201/igeof.2954436xe.2023.62.3.1440
• Publication Date: 2023-06-30T21:58:44Z
• Authors: María Alejandra A...; Patricia Alejandr...; Fernando Ariel Or...; Mónica María Elis...; Lidia Ana Otero; María Florencia C...
• Keywords: sunspots; atmospheric pressure; QC801-809; horizontal component of the geomagnetic field; Geophysics. Cosmic physics; tsunami; earthquakes; 01 natural sciences; 0105 earth and related environmental sciences

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 Scotia arch, South Atlantic. GMF records from observatories of International Magnetic Observatory Network (INTERMAGNET), WL tide stations Intergovernmental Oceanographic Commission, hourly AP databases Global Modeling Assimilation Office National Aeronautics Space Administration have been analyzed area under study. For analysis disturbances, horizontal component (H), which more susceptible to variations, was considered. analysis, discrepancy (residue) between time series predicted astronomical tides, for a 10-day period before after occurrence each earthquake, calculated. variation data gridded 1 2 hours earthquake The prior event, using high-pass filter wavelet method, showed: a) high energy ranges all frequencies, even very ones; b) oscillations amplitude peaks ± 0.2 nT, an anticipation duration consistent method. As regards residues calculated, there were largest amplitudes sensors located closest thus, those large corresponded shorter times arrival. study showed maximum followed by local minimum within range 0.3 hPa around location earthquake. While anticipated 6-2 hours, techniques used could detect Mw>7 earthquakes, associating them rising/falling surface sea. These three can be jointly implement prevention or early warning system region