# Integrated Earthquake Catalog III: Gakkel Ridge, Knipovich Ridge, and Svalbard Archipelago
## 3 Results
### Magnitude Unification in the Integrated Earthquake Catalog
#### 3.2.2 Knipovich and Gakkel Ridges
\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}{*}{\begin{tabular}{c} **Number** \\ **of Events** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **in the Integrated Catalog** \\ \end{tabular} } & \multirow{2}{*}{**Correlation**} & \multirow{2}{*}{**Figure**} & \multicolumn{2}{c}{\begin{tabular}{c} **Mmin–** \\ **Mmax. Initial** \\ **Magnitude Scale** \\ \end{tabular} } & \multirow{2}{*}{**Note**} \\ \hline GCMT & \(MW\) & 1 & 6 & \(M=MW^{\rm GCMT}\) & & 4.7–6.1 & \\ \hline ISC & \(mb\) & 2 & 130 & \(M=mb^{\rm ISC}\) & 0.78 & 11a & 3.1–5.6 & \\ \hline NEIC, & \(mb\) & 2 & 17 & \(M\)=\(mb^{\rm NIC}-0.1\) & 0.75 & 11b & 3.3–4.9 & \\ \hline BER & ML & 3 & 5927 & \(M=ML^{\rm BER}+0.3\) & 0.39 & 11c & 0.3–3.9 & \\ \hline KOLA & ML & 4 & 330 & \(M=ML^{\rm KOLA}\) & 0.79 & 12c & 1.4–3.4 & \\ \hline NAO & ML & 4 & 250 & \(M=ML^{\rm NAO}+0.4\) & 0.65 & 13a & 0.9–3.2 & 1998–2008 \\ \hline NAO & ML & 4 & 47 & \(M=ML^{\rm NAO}\) & 0.53 & 13b & 1.2–3.5 & 2009–2022 \\ \hline FCIAR & ML & 4 & 46 & \(M=ML^{\rm FCIAR}-0.7\) & 0.47 & 12f & 1.8–3.8 & \\ \hline BER & MD & 4 & 92 & \(M=MD^{\rm BER}+0.4\) & 0.43 & 13c & 0.9–3.2 & 1990–2009 \\ \hline BER & MD & 5 & 34 & \(M=MD^{\rm BER}-0.1\) & 0.25 & 13d & 0.8–2.3 & \begin{tabular}{c} 2010–2011 \\ \begin{tabular}{c} unreliable, \\ Non-linear \\ relation \\ \end{tabular} \\ \hline MOS & \(mb\) & 4 & 2 & \(M=mb^{\rm MCS}-0.3\) & 0.89 & 12a & 4.9–5.8 & \\ \hline BER & \(Mw\) & 4 & 7 & \(M=Mw^{\rm BER}-0.1\) & 0.85 & 12b & 3.1–3.9 & \\ \hline HEL & ML & 4 & 4 & \(M=ML^{\rm HHL}\) & 0.53 & 12d & 2.3–3.2 & \\ \hline IDC & \(mb\) & 4 & 1 & \(M=mb^{\rm IDC}\) & 0.78 & 12e & 3.5 & \\ \hline DNK & ML & 5 & 3 & \(M=ML^{\rm DNK}+0.7\) & 0.66 & 14a & 1.8–2.0 & \begin{tabular}{c} Poorly \\ determined \\ \end{tabular} \\ \hline EDC & ML & 5 & 7 & \(M=ML^{\rm EDC}-0.1\) & 0.20 & 14b & 2.8–4.0 & \
\begin{tabular}{c} Poorly \\ determined \\ \end{tabular} \\ \hline LAO & \(M\) & 5 & 2 & \(M=ML^{\rm LAO}+0.2\) & 0.07 & 14c & 3.4–3.8 &
\begin{tabular}{c} Poorly \\ determined \\ \end{tabular} \\ \hline NAO & \(mb\) & 5 & 1 & \(M=mb^{\rm NAO}\) & & 4 & Not Determined \\ \hline HEL & MD & 5 & 5 & \(M=MD^{\rm HEL}\) & & 3.2–4.0 & Not Determined \\ \hline BER & \(mb(Pt_{9})\) & 5 & 4 & \(M=mkPt_{9})^{\rm BER}\) & & 2.5–2.8 & Not Determined \\ \hline WAR & \(M\) & 5 & 5 & \(M=M^{\rm WAR}\) & & 2.1–3.0 & Not Determined \\ \hline NUR & \(M\) & 5 & 1 & \(M=M^{\rm WAR}\) & & 3.9 & Not Determined \\ \hline Total & & & 6921 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Magnitude in the integrated catalog: Svalbard. \(MD^{\text{BER}}\) in 2011-2012, where estimates for 20 events with no other determinations were considered unreliable. Ratios for 16 events were poorly determined due to small statistics (Figure 18). Ratios for 11 events were not determined. In total, the unified magnitude was poorly determined for less than 1% of events. Statistics and formulas for converting magnitudes in the Knipovich Ridge sub-region are presented in Table 4.