# Integrated Earthquake Catalog of the Eastern Sector of the Russian Arctic
## 4 Conclusions  
Based on the generalization and integration of data from the various networks that serve the Eastern Sector of the Arctic zone of the Russian Federation, the most complete and representative earthquake catalog has been compiled. The catalog contains information on 23,254 seismic events for the period 1962-2020, of which 7781 events are from ISC and 15,473 events are from the Russian catalogs of GS RAS. Such a detailed and universal catalog for the whole Eastern part of the AZRF never existed before. Before 1968, the catalog contained quite a small number of events. In 2020, the catalog contained the events only from the ISC because the GS RAS catalog was not completed yet. The integrated catalog is to be updated accordingly once the former catalog is available.  
The correlation of the magnitude types in the catalog was analyzed for various seismic networks. Based on the relations obtained, the unification of the magnitude estimates was carried out. For the most earthquakes, the quasi-\(M_{\rm W}\) magnitude is calculated by converting the energy class using the original regression relationships (Table 4). The distribution of event magnitudes over time and magnitude-frequency graphs are shown in Figure 20. The integrated catalog completeness is quite heterogeneous. A detailed analysis of the changes in the level of registration in space and time is a big work that goes beyond the scope of the present study. We plan to conduct this work in the future.  
Figure 20: (**a**) Distribution of the magnitude of events in time. (**b,c**) Magnitude–frequency graphs before 1982 (**b**) and after 1982 (**c**). Before 1982, the energy classes were integers, and so the magnitudes are in increments of 0.5.  
The creation of the unified magnitude-based integrated earthquake catalog realized in this paper opens new prospects in earthquake studies in the Arctic region. Further development of the Russian Arctic seismic zonation and systems analysis of strong earthquake-prone areas are among them.  
The map of earthquake epicenters of the integrated catalog is shown in Figure 21. The catalog developed in this article is made available to the public on the website of the World Data Center for Solid Earth Physics, Moscow, at [[http://www.wdcb.ru/arctic_antarctic/arctic_seism.html](http://www.wdcb.ru/arctic_antarctic/arctic_seism.html)]([http://www.wdcb.ru/arctic_antarctic/arctic_seism.html](http://www.wdcb.ru/arctic_antarctic/arctic_seism.html)), (accessed on 20 March 2022).  
**Author Contributions:** Conceptualization, A.D.G., L.A.V. and P.N.S.; data curation, P.N.S., B.A.D. and A.A.S.; formal analysis, I.A.V.; investigation, P.N.S., B.A.D., B.V.D. and A.A.S.; methodology, I.A.V.; resources, B.A.D.; software, I.A.V.; validation, I.A.V. and A.A.S.; visualization, I.A.V. and B.V.D.; writing--original draft, A.D.G., I.A.V., P.N.S., B.A.D., B.V.D. and A.A.S.; writing--review and editing, A.D.G., I.A.V., P.N.S., B.A.D., B.V.D. and A.A.S. All authors have read and agreed to the published version of the manuscript.  
**Funding:** The reported study was funded by the Russian Science Foundation, project number 21-77-30010, System analysis of geophysical process dynamics in the Russian Arctic and their impact on the development and operation of the railway infrastructure.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Not applicable.  
**Acknowledgments:** This work employed data provided by the Shared Research Facility, the Analytical Geomagnetic Data Center of the Geophysical Center of RAS ([[http://ckp.gcras.ru/](http://ckp.gcras.ru/)]([http://ckp.gcras.ru/](http://ckp.gcras.ru/)) accessed on: 24 February 2022).  
**Conflicts of Interest:** The authors declare no conflict of interest.  
Figure 21: Map of earthquake epicenters of the integrated catalog of the Eastern Sector of the Arctic zone of the Russian Federation. The red and blue circles are the epicenters from the catalogs of GS RAS and ISC, respectively.