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http://hdl.handle.net/2122/14395
Authors: | Marchetti, Dedalo* De Santis, Angelo* Jin, Shuanggen* Campuzano, Saioa Arquero* Cianchini, Gianfranco* Piscini, Alessandro* |
Title: | Co-Seismic Magnetic Field Perturbations Detected by Swarm Three-Satellite Constellation | Journal: | Remote Sensing | Series/Report no.: | /12 (2020) | Publisher: | MDPI | Issue Date: | 2020 | DOI: | 10.3390/rs12071166 | Keywords: | coseismic phenomena ionospheric phenomena |
Subject Classification: | 01.02. Ionosphere 04.05. Geomagnetism 04.06. Seismology |
Abstract: | 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. |
Appears in Collections: | Article published / in press |
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