## 3 Results
### A Pattern of Seismic Activity at the Globe after the Magnetic Storms on 17 March 2013 and 2015
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Earthquake Date** & **Time UTC** & **Geographic** & **Geographic** & **Depth (km)** & **Magnitude** & **The Delay between Storm** \\
**(y-mon-day, Place)** & **Time UTC** & **Latitude** & **Logitude** & **Depth (km)** & **Magnitude** & **Onset and Earthquake** \\ \hline \hline \multicolumn{8}{c}{The strongest earthquakes responsible for _Es_ peaks in April of 2013 and 2015} \\ \hline
2013-04-16 Iran & 10:44:20 & 28.033\({}^{\circ}\)N & 61.996\({}^{\circ}\)E & 80 & 7.7 & 30 \\ \hline
2015-04-25 Nepal & 06:11:25 & 28.231\({}^{\circ}\)N & 84.731\({}^{\circ}\)E & 8.2 & 7.8 & 39 \\ \hline \multicolumn{8}{c}{The strongest earthquakes responsible for _Es_ peaks in May of 2013 and 2015} \\ \hline
2013-05-24 Okhotsk sea & 05:44:48 & 54.892\({}^{\circ}\)N & 153.221\({}^{\circ}\)E & 598.1 & 8.3 & 68 \\ \hline
2015-05-30 Japan & 11:23:02 & 27.839\({}^{\circ}\)N & 140.493\({}^{\circ}\)E & 664.0 & 7.8 & 74 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The data on the earthquakes, which are mainly responsible for the Es peaks, are marked in Figure 4 as 1 and 2.  
help of an online program: [[https://omniweb.gsfc.nasa.gov/vitmo/cgm.html](https://omniweb.gsfc.nasa.gov/vitmo/cgm.html)]([https://omniweb.gsfc.nasa.gov/vitmo/cgm.html](https://omniweb.gsfc.nasa.gov/vitmo/cgm.html)), accessed on 1 April 2024. The geomagnetic storm on 17 March 2013 started at 06:04 UT. At this time, at a point with coordinates 28.033\({}^{\circ}\)N, 61.996\({}^{\circ}\)E (M = 7.7 event in Iran on 16 April 2013), the magnetic local time was equal to MLT = 10.48 h. At a point with coordinates 54.892\({}^{\circ}\)N, 153.221\({}^{\circ}\)E (M = 8.3 event in Okhotsk Sea on 24 May 2013), the magnetic local time was equal to MLT = 15.66 h.  
This means that the high-latitudinal areas of the longitudes at which a major crust earthquake in Iran and a deep-focused great earthquake in the Okhotsk Sea occurred, were located under the polar cusps, which longitudinal extension may be 08 h-16 h MLT [37]. The geomagnetic storm on 17 March 2015 started at 04:48 UT. At this time, at a point with coordinates 28.231\({}^{\circ}\)N, 84.731\({}^{\circ}\)E (M = 7.8 event in Nepal on 25 April 2015), the magnetic local time was equal to MLT = 10.54 h. At a point with coordinates 27.839\({}^{\circ}\)N, 140.493\({}^{\circ}\)E (M = 7.8 event in Japan on 30 May 2015), the magnetic local time was equal to MLT = 13.82 h. This means again that the high-latitudinal areas of the longitudes at which the major earthquakes in Nepal and Japan occurred were located under the polar cusps. Thus, these results suggest that, after a magnetic storm, major and great earthquakes may occur in those longitudinal regions where high-latitudinal areas are located under the polar cusp at the time of the magnetic storm onset. Cases Study for Ten Other Earthquakes with M \(\geq\) 7.5, Which Occurred around the Globe in 2013 and 2015  
To check that the above results are not accidental, we conducted similar analyses for ten other seismic events with M \(\geq\) 7.5, which occurred around the globe in 2013 and 2015. For example, on 21 June 2015, a powerful geomagnetic storm (SYM/H = -208 nT) started (Figure 6). At the main phase of this storm, on 22 June 2015 at 18:37 UTC, a jump-like solid growth in the solar wind and geomagnetic parameters occurred with a positive value of SYM/H = +88 nT. It is not difficult to estimate that, at this time (18:37 UTC), the American longitudinal region was located on the dayside. Compared to the above-considered cases, one may expect that, some weeks or months later, a strong earthquake may have occurred in this longitudinal region, and that was the case.