# Integrated Earthquake Catalog II: The Western Sector of the Russian Arctic
## 3 Results
### Statistics of the Integrated Catalog for Two Sub-Regions
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Time Period, Catalog** & **\(N\) Total** & **\(N\) from ISC** & \(N\) from GS** & \(Mc\) & \(N_{r}\) & \(M\geq Mc\) & \(M\)max \\ \hline
**1962–2022** & & & & & & \\ \hline E\_Arctic & 4629 & 4072 (88\%) & 558 (12\%) & & & 4.8 \\ \hline Kola–Karelia & 4207 & 3754 (89\%) & 454 (11\%) & & & 4.8 \\ \hline The Kara and Barents shelf & 422 & 256 (61\%) & 166 (39\%) & & & 4.8 \\ \hline
**1998–2020** & & & & & & \\ \hline E\_Arctic & 2126 & 1715 (81\%) & 411 (19\%) & 3.5 & 50 & 4.7 \\ \hline Kola–Karelia & 1715 & 1506 (88\%) & 209 (12\%) & 1.7 & 561 & 4.6 \\ \hline The Kara and Barents shelf & 410 & 209 (51\%) & 201 (49\%) & 3.5 & 44 & 4.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Statistics of the integrated catalog. Until 1980, only a few seismic events were registered in the sub-region of the Kola Peninsula and Karelia. The period 1998-2020 can be used to determine seismicity parameters. Preliminary estimates-\(Mc=1.8\) in 1998-2011, \(Mc=1.3\) in 2012-2020. Until 1995, the catalog contains few events in the sub-region of the Kara and Barents Seas shelf with \(Mc=4.5\). To determine seismicity parameters, the period 1998-2020 can be used. Preliminary estimates suggest \(Mc=3.5\) for 1995-2020. The increase in the number of small events is related to the western part of the shelf near Svalbard, where the registration level is much better, and the preliminary estimate \(Mc=2.3\). Figure 21: Sub-region of the Kola Peninsula and Karelia. Differential magnitude-frequency graphs for different time periods and preliminary estimates of completeness magnitude \(Mc\). Figure 20: Sub-region of the Kola Peninsula and Karelia. Event distribution over time and magnitude. Blue indicates periods unfiltered for explosions/rock bursts. Colored dots show events with unreliable magnitudes. The overwhelming majority of such events belong to periods with unfiltered explosions. The dashed line shows preliminary estimates of completeness magnitude \(Mc\). Figure 24 shows a map of spatial variations in the completeness magnitude \(Mc\) in the integrated catalog for the period 1998-2020, which was constructed using a multi-scale method [36]. The volume of registered seismicity is sufficient for mapping only in the western part of the region on the Kola Peninsula and in Karelia as well as in the vicinity of the Svalbard Archipelago. In the rest of the region, only a regional value of \(Mc\) = 3.5 can be determined. Preliminary estimates of \(Mc\) = 1.8 on the Kola Peninsula and in Karelia and \(Mc\) = 2.3 in the vicinity of the Svalbard Archipelago were confirmed. Figure 23: Sub-region of the Kara and Barents Seas shelf: (**a–d**) represent differential magnitude-frequency graphs in different periods and preliminary estimates of completeness magnitude. (**e**) shows the magnitude-frequency graph in the vicinity of the Svalbard Archipelago. Figure 22: Sub-region of the Kara and Barents Seas shelf. Distribution of events by time and magnitude. The blue color highlights periods not cleared from explosions/rock bursts. Colored dots show events with unreliable magnitudes. The dashed line is a preliminary estimate of completeness magnitude \(Mc\).