# Integrated Earthquake Catalog II: The Western Sector of the Russian Arctic
## 3 Results
### Magnitudes in the Integrated Catalog of the Western Sector of the AZRF
#### 3.2.2 The Kara and Barents Seas Shelf  
In the sub-region of the Kara and Barents Seas shelf, there are no events with magnitude \(Mw^{\rm GCMT}\). Thus, a direct unification of magnitude to the moment scale is impossible. Magnitudes \(mb^{\rm ISC}\) and \(mb^{\rm NEC}\) were determined for 45 events (Figure 1). There are also a small number of determinations for magnitudes \(mb\) from other agencies. Most events have a local magnitude \(ML\) from various agencies, predominantly \(ML^{\rm BER}\). For some earthquakes, magnitudes \(MD^{\rm BER}\) and other types determined by the GS RAS are available. The unified magnitude \(mb\) was determined by regression ratios with \(mb^{\rm ISC}\) (Figure 15). The unified local magnitude \(ML\) was determined by a regression relationship with \(ML^{\rm BER}\) (Figure 16). In some cases, it was necessary to use indirect correlations--relationships are unreliable (Figure 17). Regression relationships could not be established for six events. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Agency**} & \multirow{2}{*}{
\begin{tabular}{c} **Type of** \\ **Magnitude** \\ \end{tabular} } & \multirow{2}{*}{**Priority**} & \multirow{2}{*}{**Number**} & \multirow{2}{*}{**Magnitude in the** **Integrated Catalog**} & \multirow{2}{*}{**Figure**} & \multicolumn{2}{c}{**Mmin—Mmax.**} & \multirow{2}{*}{**Note**} \\  & & & & & & & **Initial** \\ \hline
**ISC** & \(mb\) & 1 & 4 & \(mb=mb^{\rm ISC}\) & & 3.3–4.8 & \\ \hline
**NEIC, NEIS** & \(mb\) & 1 & 3 & \(mb=mb^{\rm NEC}\) & & 4.3–4.7 & \\ \hline
**KOLA** & \(ML\) & 2 & 398 & \(ML=ML^{KOLA}\) & & 0.3–2.7 & \\ \hline
**HEL** & \(ML\) & 3 & 1554 & \(ML=ML^{\rm HEL}\) + 0.3 & Figure 11a & 0.0–3.6 & \\ \hline
**NAO** & \(ML\) & 3 & 140 & \(ML=ML^{\rm NAO}\) + 0.1 & Figure 11b & 1.1–4.5 & \\ \hline
**IDC** & \(ML\) & 3 & 309 & \(ML=ML^{\rm DEC}\) & Figure 11c & 0.8–3.4 & \\ \hline
**BER** & \(ML\) & 3 & 27 & \(ML=ML^{\rm HER}\) + 0.4 & Figure 11d & 0.3–3.4 & \\ \hline
**UPP** & \(ML\) & 3 & 42 & \(ML=ML^{\rm LIPP}\) + 0.2 & Figure 11e & 1.5–3.2 & \\ \hline
**LVSN** & \(ML\) & 3 & 76 & \(ML=ML^{\rm LVSM}\) & Figure 11f & 0.8–2.4 & \\ \hline
**VEP** & \(ML\) & 3 & 319 & \(ML=ML^{\rm VEP}\) + 0.2 & Figure 11g & 0.1–4.0 & \\ \hline
**OBN** & \(ML\) & 3 & 4 & \(ML=ML^{\rm ONR}\) + 0.1 & Figure 11h & 0.1–1.0 & \\ \hline
**HEL** & \(MD\) & 4 & 16 & \(ML=MD^{\rm HEL}\) + 0.1 & Figure 13a & 1.6–2.6 &
\begin{tabular}{c} Probably \\ non-earthquakes \\ \end{tabular} \\ \hline
**BER** & \(MD\) & 4 & 150 & \(ML=MD^{\rm BER}-0.2\) & Figure 13b & 2.0–4.1 &
\begin{tabular}{c} Probably \\ non-earthquakes \\ \end{tabular} \\ \hline
**EIDC** & \(ML\) & 4 & 1001 & \(ML=ML^{\rm EIDC}-0.7\) & Figure 13c & 1.1–4.4 &
\begin{tabular}{c} Indirect correlation \\ through \(MD^{\rm BER}\). \\ Probably \\ non-earthquakes \\ \end{tabular} \\ \hline
**HFS** & \(mb\) & 4 & 52 & \(ML=mb^{\rm HFS}-1.2\) & Figure 13d & 3.0–5.3 &
\begin{tabular}{c} Indirect correlation \\ through \(MD^{\rm BER}\). \\ Probably \\ non-earthquakes \\ \end{tabular} \\ \hline
**IDC** & \(mb\)tmp & 4 & 2 & \(ML=mb^{\rm Trp}-0.8\) & Figure 13e & 2.8–3.4 & \\ \hline
**VEP** & \(MPSP\) & 4 & 102 & \(mb=MPSP^{\rm VEP}-0.3\) & Figure 12 & 1.0–4.9 &
\begin{tabular}{c} See note to \\ Figure 12. Probably \\ non-earthquakes \\ \end{tabular} \\ \hline
**NAO** & \(mb\) & 5 & 2 & \(M=mb^{\rm NAO}\) & & 3.1–3.2 & Not determined \\ \hline
**EIDC** & \(mb\) & 5 & 1 & \(M=mb^{\rm EIDC}\) & & 3.6 & Not determined \\ \hline
**BER** & \(M\) & 5 & 3 & \(M=M^{\rm BER}\) & & 2.5–4.0 & Not determined \\ \hline
**HEL** & \(M\) & 5 & 2 & \(M=M^{\rm HEL}\) & & 1.8 & Not determined \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Unified magnitude in the catalog of the western sector of the Russian Arctic: sub-region Kola–Karelia. There are 10 events with energy class measures \(k\) on the Franz Josef Land archipelago. Eight of them occurred in the end of 1983 or the beginning of 1984 and have the same epicenter coordinates.