# Integrated Earthquake Catalog of the Eastern Sector of the Russian Arctic
## 3 Results
### Magnitudes in the Integrated Catalog of the Eastern Sector of the Russian Arctic
For weaker earthquakes, \(M_{\rm S}<M_{\rm W}\) (Figure 13b) is used, which generally agrees with previously obtained correlations [41]. There are 105 events in the integrated catalog with the magnitude \(M_{\rm W}\)\({}^{\rm GCMT}\). During the considered period, 15 earthquakes with an \(M\) of \(>\)6.0 occurred. Two strong earthquakes occurred in 1969 (\(mb=6.4\) and \(M_{\rm S}=7.5\)) and 1971 (\(mb=6.0\) and \(M_{\rm S}=7.0\)). For these earthquakes, the \(M_{\rm S}\) estimate is preferred (Figure 13b, Table 5). For the remaining 13 strong earthquakes, the magnitude \(M_{\rm W}\)\({}^{\rm GCMT}\) is known. To determine the magnitude by energy class, the correlation with the magnitude \(mb^{\text{ISC}}\) was used (Figure 14). The Yakutsk and Northeastern branches of the GS RAS estimate the Rautian \(K_{\text{PS}}\) class [42], while the Kamchatka Branch estimates the Fedotov \(K_{\text{S}}\) class [44]. Earthquakes in Kamchatka were selected only in the studied territory, north of latitude 57.5\({}^{\circ}\). Figure 13: Correlation ratios of GCMT and ISC magnitudes: (**a**) \(M_{\text{W}}\)\({}^{\text{GCMT}}\) and \(mb^{\text{ISC}}\) for \(M_{\text{W}}\) < 6.0 and (**b**) \(M_{\text{W}}\)\({}^{\text{GCMT}}\) and \(M_{\text{S}}\)\({}^{\text{ISC}}\) for \(M_{\text{W}}\) \(\geq\) 6.0. The dashed lines show 95% confidence intervals. The events with an \(M_{\text{W}}\) of \(\geq\)6.0 are highlighted in red. \begin{table}
\begin{tabular}{c c c c c c c} \hline  & **Date** & **TIME** & **Lat** & **Lon** & **Dep** & **Mag** \\ \hline
1 & 22.11.1969 & 23:09:38 & 57.67 & 163.51 & 25.6 & 7.5 & \(M_{\text{S}}\)\({}^{\text{ISC}}\) \\ \hline
2 & 18.05.1971 & 22:44:41 & 63.93 & 145.96 & 1.5 & 7.0 & \(M_{\text{S}}\)\({}^{\text{ISC}}\) \\ \hline
3 & 08.03.1991 & 11:36:31 & 60.83 & 167.08 & 16.5 & 6.6 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
4 & 24.10.1996 & 19:31:55 & 66.92 & \(-\)173.04 & 22.2 & 6.0 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
5 & 20.04.2006 & 23:25:02 & 60.88 & 167.05 & 23.9 & 7.6 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
6 & 21.04.2006 & 4:32:44 & 60.45 & 165.96 & 14.6 & 6.1 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
7 & 21.04.2006 & 11:14:16 & 61.30 & 167.75 & 22.8 & 6.0 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
8 & 29.04.2006 & 16:58:06 & 60.45 & 167.62 & 10.9 & 6.6 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
9 & 22.05.2006 & 11:11:59 & 60.73 & 165.81 & 13.9 & 6.6 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
10 & 22.06.2008 & 23:56:30 & 67.70 & 141.39 & 18.8 & 6.1 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
11 & 30.04.2010 & 23:11:43 & 60.46 & \(-\)177.91 & 14.7 & 6.5 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
12 & 30.04.2010 & 23:16:29 & 60.48 & \(-\)177.60 & 18.3 & 6.3 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
13 & 24.06.2012 & 3:15:01 & 57.50 & 163.41 & 16 & 6.0 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
14 & 14.02.2013 & 13:13:52 & 67.52 & 142.70 & 8.9 & 6.7 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline
15 & 09.01.2020 & 8:38:08 & 62.36 & 171.06 & 10 & 6.4 & \(M_{\text{W}}\)\({}^{\text{GCMT}}\) \\ \hline \end{tabular}
\end{table} 
Table 5: Strong earthquakes in the Eastern Arctic. The magnitude ratio of \(mb^{\rm ISC}\) and \(K_{\rm PS}\) is the same in Yakuttia and in the northeast. The ratio for \(K_{\rm S}\) in Kamchatka is noticeably different since in the formula of energy classes according to [PERSON] [43, 44], \(K_{\rm S}=2 lgA_{\rm peak}+f(r)\), while in the classes according to [PERSON] [42, 43], \(K_{\rm PS}=1.8 lgA_{\rm peak}+f(r)\), where \(A_{\rm peak}\) is a peak amplitude of an S-wave or the sum of peak amplitudes of P- and S-waves, and \(f(r)\) is an attenuation function. In the unified catalog, 1551 earthquakes have other types of magnitudes. We try to give estimates in \(M_{\rm W}\), which is an absolute scale in the first approximation.