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Open AccessArticle

Co-Seismic Magnetic Field Perturbations Detected by Swarm Three-Satellite Constellation

1
School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, 00143 Rome, Italy
3
Jiangsu Engineering Center for Collaborative Navigation/Positioning and Smart Applications, Nanjing 210044, China
4
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
*
Author to whom correspondence should be addressed.
Now at Instituto de Geociencias IGEO (CSIC-UCM), 28040 Madrid, Spain.
Remote Sens. 2020, 12(7), 1166; https://doi.org/10.3390/rs12071166
Received: 14 January 2020 / Revised: 25 March 2020 / Accepted: 1 April 2020 / Published: 5 April 2020
The first 5.3 years of magnetic data from three Swarm satellites have been systematically analyzed, and possible co-seismic magnetic disturbances in the ionosphere were investigated just a few minutes after the occurrence of large earthquakes. We preferred to limit the investigation to a subset of earthquakes selected in function of depth and magnitude. After a systematic inspection of the available data around (in time and space) the seismic events, we found 12 Swarm satellite tracks with co-seismic disturbances possibly produced by ten earthquakes from Mw5.6 to Mw6.9. The distance of the satellite to the earthquake epicenter corresponds to the measured distance-time arrival of the disturbance from the surface to the ionosphere, confirming that the identified disturbances are most likely produced by the seismic events. Secondly, we found a good agreement with a model that combined a propagation of the disturbance to the F2 ionospheric layer with an acoustic gravity wave at a velocity of about (2.2 ± 0.3) km/s and a second faster phenomenon that transmits the disturbance from F2 layer to the Swarm satellite with a velocity of about (16 ± 3) km/s as an electromagnetic scattering propagation. View Full-Text
Keywords: geomagnetic field; co-seismic magnetic disturbance; Swarm satellites; earthquakes; gravity waves geomagnetic field; co-seismic magnetic disturbance; Swarm satellites; earthquakes; gravity waves
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Marchetti, D.; De Santis, A.; Jin, S.; A. Campuzano, S.; Cianchini, G.; Piscini, A. Co-Seismic Magnetic Field Perturbations Detected by Swarm Three-Satellite Constellation. Remote Sens. 2020, 12, 1166.

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