# Integrated Earthquake Catalog III: Gakkel Ridge, Knipovich Ridge, and Svalbard Archipelago
## 3 Results
### Statistics of the Integrated Catalog for Three Sub-Regions  
Figure 20 shows the distribution of earthquake epicenters from the created integrated catalog. The catalog contains 17,922 events, 989 events are from Russian catalogs, and the rest are from ISC. In the sub-regions of Svalbard and Knipovich Ridge, the addition of Russian data to ISC is insignificant. However, in the Gakkel Ridge, Russian data accounts for more than a quarter of the events, and more than half since 2012. Detailed statistics are provided in Table 6.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  
Figure 20: Map of earthquake epicenters \(M\geq 2.0\) of the integrated catalog. Blue dots show events from the ISC catalog, and red dots show events from Russian catalogs. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Time Period, Catalog \({}^{\star}\)** & \(N\) **Total** & \(N\) **from ISC** & \(N\) **from GS RAS, Morozov** & \(M\)c & \(\frac{N_{t}}{M\geq M_{\text{c}}}\) & \(M\)max \\ \hline
1962–2022 & & & & & & \\ \hline N\_Arctic & 17,922 & 16,933 (94.2\%) & 989 (5.8\%) & - & & 6.7 \\ \hline Svalbard & 6921 & 6617 (95.6\%) & 304 (4.4\%) & - & & 6.1 \\ \hline Knipovich Ridge & 8912 & 8794 (98.7\%) & 118 (1.3\%) & - & & 6.7 \\ \hline Gakkel Ridge & 2089 & 1522 (72.9\%) & 567 (27.1\%) & - & & 6.5 \\ \hline
1962–1994 & & & & & & \\ \hline N\_Arctic & 703 & 683 (97.2\%) & 20 (2.8\%) & 5.0 & 181 & 6.7 \\ \hline Svalbard & 94 & 94 (100\%) & 0 (0\%) & 4.5 & 20 & 5.6 \\ \hline Knipovich Ridge & 329 & 329 (100\%) & 0 (0\%) & 4.7 & 166 & 6.7 \\ \hline Gakkel Ridge & 280 & 260 (92.9\%) & 20 (7.1\%) & 5.0 & 102 & 6.5 \\ \hline
1995–2011 & & & & & & \\ \hline N\_Arctic & 4377 & 4261 (97.3\%) & 116 (2.7\%) & 4.0 & 762 & 6.5 \\ \hline Svalbard & 2209 & 2103 (95.2\%) & 105 (4.8\%) & 2.8 & 696 & 6.1 \\ \hline Knipovich Ridge & 1408 & 1405 (99.8\%) & 3 (0.2\%) & 4.0 & 275 & 6.5 \\ \hline Gakkel Ridge & 760 & 752 (98.9\%) & 8 (1.1\%) & 4.0 & 454 & 6.2 \\ \hline
2012–2022 & & & & & & \\ \hline N\_Arctic & 12,842 & 11,989 (95.4\%) & 853 (6.6\%) & 4.0 & 657 & 6.0 \\ \hline Svalbard & 4618 & 4419 (95.7\%) & 199 (4.3\%) & 1.7 & 2351 & 5.3 \\ \hline Knipovich Ridge & 7175 & 7060 (98.4\%) & 115 (1.6\%) & 2.8 & 3447 & 6.0 \\ \hline Gakkel Ridge & 1049 & 510 (48.6\%) & 539 (51.4\%) & 4.0\({}^{\star}\) & 388 & 5.9 \\ \hline \hline \end{tabular} \({}^{\star}\) Excluding the most eastern segment, where \(M\)c = 4.5.  
\end{table} 
Table 6: Statistics of the integrated catalog. Figure 24 shows spatial-temporal variations of the magnitude of complete registration \(M\)c, constructed using the multi-scale method. To determine spatial-temporal variations of the magnitude of complete registration, we used the author's multi-scale method [33; 34]. It was developed for the analysis of heterogeneous catalogs with significant variations in the registration level. The algorithm was based on adapting the dimension of the studied zone to the range of the event magnitude. We associated ranges of larger magnitudes with increasing areas for data selection. The high resolution of the \(M\)c-value was achieved through the determination of the smallest space-magnitude scale in which the Gutenberg-Richter law is verified. The high accuracy and resolution of the method were confirmed by  
Figure 23: Gakkel Ridge. (**a**) Event distribution over time and unified magnitude; (**b**) non-cumulative frequency-magnitude distributions in different periods. Colored dots in (**a**) show events with unreliable magnitudes (Table 5), and the dashed lines show preliminary estimates of the completeness magnitude \(M\)c.  
Figure 22: Knipovich Ridge. (**a**) Event distribution over time and unified magnitude; (**b**) non-cumulative frequency-magnitude distributions in different periods.