# Integrated Earthquake Catalog of the Eastern Sector of the Russian Arctic
## 3 Results
### Merging Catalogs
#### 3.1.5 Stage 5. Exclusion of Explosions  
At the final stage, we check the catalog for any type of explosion. The information about the 12 explosions in the ISC catalog is given in the ISC bulletins. In addition, 104 events are labeled \"exp\" or \"exp\" in the NER and YAK catalogs from the annual journal _Earthquakes in Northern Eurasia_. In the annual journal _Earthquakes in Russia_, explosions are excluded by the authors. We merged all explosions into the EXP catalog and performed duplicate analysis.  
We choose EXP as the main catalog and ARCTIC, which was obtained as a result of combining ISC and Russian data, as the additional one. The duplicate analysis was performed with the standard distribution parameters \(\sigma_{\rm T}=0.05\) min and \(\sigma_{X}=\sigma_{Y}=15\) km. All 116 events of the EXP catalog are absolute duplicates of the events from the ARCTIC catalog. After the explosions were removed, the final integrated catalog of the Eastern Sector of the Arctic zone of the Russian Federation, E_ARCTIC, contains 23,254 events. The assembly scheme, statistics, and parameters for excluding duplicates are presented in Table 3.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Stage**} & \multirow{2}{*}{**Main Catalog**} & \multirow{2}{*}{**Additional Catalog**} & \multirow{2}{*}{**Metric Parameters**} & \multirow{2}{*}{**Threshold Value**} & \multirow{2}{*}{**Estimation of the Number**} & \multirow{2}{*}{**Number of**} \\  & & & & & & & **the Number** \\ \multirow{2}{*}{1} & \multirow{2}{*}{\(\sigma_{\rm T}\) min} & \multirow{2}{*}{**\(\sigma_{\rm X}\) km,**} & & & & **of Errors** & \\ \hline \multirow{2}{*}{1} & Catalog of & Catalog of the Northeast & 0.041; & & & & \\  & Yakakura YAK & of Russia & 17.4 & 5.8 & 0.5\% & 2153 & \begin{tabular}{c} YAK NER \\ 12,115 events \\ \end{tabular} \\ \hline \multirow{2}{*}{2} & YAK\_NER & Earthquake catalog of the & 0.041; & & & & \\  & 12,115 events & Kamchaka Branch of the GS RAS & 17.4 & 5.8 * & – & 26 * & \begin{tabular}{c} RUS \\ 16,587 events \\ \end{tabular} \\ \hline \multirow{2}{*}{3} & RUS & ISC, events of various agencies & 0.032; & & & & \\  & 16,587 events & ISC\_Other 16,642 events & 12.0 & & & & \\ \hline \multirow{2}{*}{4} & CORE & RUS\_ISC & 0.044; & & & & \\  & 1383 events & 22,998 events & 18.3 & 5.9 & 0.4\% & 1011 & \
\begin{tabular}{c} ARCTIC \\ 23,370 events \\ \end{tabular} \\ \hline \multirow{2}{*}{5} & Exclusion of & ARCTIC & 0.05; & & & & \\  & EXP’116 events & 23,370 events & 15.0 & – & 0\% & 116 ** &
\begin{tabular}{c} E\_ARCTIC \\ 23,254 events \\ \end{tabular} \\ \hline \hline \end{tabular}  
* A small number of duplicates does not allow estimating the number of errors and optimizing the metric threshold. **All duplicates are absolute.  
\end{table}
Table 3: Scheme and compilation parameters of the integrated catalog.  
Figure 12: Distribution of normalized \(DT\) and \(DR\) and metric level lines (1). The colored dots are the CORE/RUS_ISC pairs and the black dots are the distances between the CORE/CORE events in metric (1). The metric levels \(Ro=5.9\) and \(Ro=8.4\) are shown by lines.