# Co-Seismic Magnetic Field Perturbations Detected by Swarm Three-Satellite Constellation
## 3 Results of the Analysis
On the other hand, in the Figures S1-S10, the magnetic disturbance cannot be explainable merely by geomagnetic activity, which was low at the acquisition time; nevertheless, it could be induced by some other geophysical source (such as electric and magnetic fields produced by ocean currents--[PERSON] et al., 2016--or tectonic stress along the ocean drift). \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Earthquake Characteristics**} & \multicolumn{4}{c}{**Satellite Characteristics**} & \multicolumn{4}{c}{**Relative Characteristics**} \\ \hline  & & & & & & & & & & & & & & & & & & & & \\ \hline  & & & & & & & & & & & & & & & & & & & & \\ \hline  & & & & & & & & & & & & & & & & & & & & & \\ \hline
2014-02-18 & 23:35:58 & \(-\)14.165 & \(-\)75.6 & 5.9 & 57.0 & B & D & 500.2 & 10.003 & \(-\)74.187 & 292 & 454 & 2687 & 2733.2 & 5.151 \\  & & & & & & C & D & 499.5 & 11.164 & \(-\)74.514 & 292 & 454 & 2814 & 2858.0 & 6.184 \\ \hline
2014-10-22 & 00:15:17 & 27.416 & 128.553 & 5.8 & 43.0 & A & U & 462.6 & 48.228 & 129.711 & 292 & 254 & 2312 & 2357.8 & 4.617 \\ \hline
2015-11-11 & 02:46:19 & \(-\)29.51 & \(-\)72.058 & 6.9 & 10.0 & A & U & 463.7 & \(-\)39.037 & \(-\)71.541 & 289 & 368 & 1059 & 1156.1 & 3.050 \\ \hline
2016-04-17 & 07:31:00 & \(-\)23.495 & \(-\)174.247 & 5.7 & 10.0 & C & D & 449.5 & 27.676 & \(-\)174.798 & 296 & 268 & 5680 & 5697.8 & 6.650 \\ \hline
2016-04-29 & 01:33:38 & 10.275 & \(-\)103.736 & 6.6 & 10.0 & C & D & 444.9 & 51.651 & \(-\)103.638 & 305 & 321 & 4593 & 4614.5 & 8.050 \\ \hline
2016-06-15 & 06:58:27 & \(-\)62.366 & 166.58 & 5.7 & 10.0 & B & D & 518.7 & \(-\)26.200 & 168.448 & 266 & 310 & 4017 & 4050.3 & 6.550 \\ \hline
2017-01-16 & 12:42:10 & 3.317 & 98.47 & 5.6 & 6.0 & A & D & 451.1 & \(-\)0.973 & 97.400 & 297 & 349 & 4907 & 4927.7 & 6.517 \\ \hline
2018-07-17 & 07:02:53 & \(-\)11.594 & 166.432 & 6.0 & 38.0 & C & D & 448.0 & \(-\)8.287 & 165.250 & 301 & 271 & 3891 & 3916.7 & 8.683 \\ \hline
2019-04-05 & 16:14:16 & \(-\)55.932 & \(-\)27.846 & 6.4 & 58.4 & B & U & 510.0 & \(-\)30.412\(-\)28.208 & 274 & 231 & 2833 & 2878.5 & 3.517 \\ \hline
2019-04-07 & 10:52:41 & \(-\)33.764 & \(-\)72.521 & 5.6 & 10.0 & A & U & 470.0 & \(-\)53.197\(-\)73.643 & 290 & 288 & 2159 & 2209.6 & 5.517 \\ \cline{2-11}  & & & & & & C & U & 470.0 & \(-\)52.592\(-\)72.142 & 290 & 288 & 1884 & 2090.0 & 5.567 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: List of the earthquakes that created a potential magnetic disturbance in the ionosphere as detected from the Swarm satellite. The orbital characteristics are reported (satellite, direction of the semi-orbit: D for downward orbit, U for upward orbit, altitude, latitude and longitude) in the moment of disturbance detection. The height of the F2 ionospheric layer (hmF2) and the surface air temperature are also provided. Figure 4: Residual of the Y component of the Swarm Charlie magnetic field after the occurrence of the Mw 5.9 2014-02-18 earthquake. The vertical black line in the lower plot represents the point where the satellite crosses the earthquake latitude. The vertical green line is the candidate point where the earthquake-induced phenomena are supposed to start. This anomaly has been selected as it is the wider after the earthquake occurrence and it is the corresponding anomaly of the previous track (acquired after few seconds). In the Supplementary Materials, more details and the other available Swarm magnetic data are represented (Figure S1). Figure 3: Residual of the Y component of the Swarm Bravo magnetic field after the occurrence of the Mw 5.9 2014-02-18 earthquake. The vertical black line in the lower plot represents the point where the satellite crosses the earthquake latitude. The vertical green line is the candidate point where the earthquake-induced phenomena are supposed to start.