# Integrated Earthquake Catalog II: The Western Sector of the Russian Arctic
It should be noted that earthquakes that occurred in the northeast of the peninsula were included in the integrated catalog of the eastern sector of the AZRF [7] and are not considered in this article. The White Sea Basin, including its waters and adjacent territory, is one of the most fragmented and mobile regions within the East European Platform. The most active tectonic structure here is the Kandalaksha Graben. The maximum intensity of paleo-earthquakes in the western part of Kandalaksha Bay (the bay of the White Sea in the south of the Kola Peninsula) is IX, in the central part of the sea, it is VIII, and on the western coast of the White Sea and in Onega Bay, it is VII-VIII. The White Sea Basin has a high seismic potential with a rare recurrence of strong earthquakes [16]. The full-scale study of the seismic regime of the western sector of the AZRF began in the late 1970s as part of the creation of the catalog [10]. Subsequently, for several decades, researchers noted the insufficient development of the seismic observation network in the region, which allowed the registration of events only with \(M\geq 5.0\)[17; 18]. Over the past two decades, significant contributions to the development of seismic monitoring in the west of the AZRF have been made by the unique scientific facilities of Federal Center for Integrated Arctic Research, Russia, Arkhangelsk (FCIAR) [19; 20; 21; 22]. Based on unique seismic data obtained by FCIAR, the structure of the lithosphere and upper mantle has been specified, regional hodographs have been constructed [23], and parameters of earthquakes that occurred in marine waters during the period from 1908 to 2020 have been refined. As a result, an updated catalog containing data on 125 earthquakes has been obtained [24]. On the maps of the General Seismic Zoning GSZ-97A, GSZ-2015A, and GSZ-2016A, the region is classified as zones with macroseismic intensity estimates V-VI [25; 26; 27; 28; 29; 30]. In recent years, a seismic zoning map of the AZRF has been created [31]. Currently, the Geophysical Survey of the Russian Academy of Sciences (GS RAS) carries out the seismic monitoring of the entire territory of the Russian Arctic ([[http://www.gsras.ru/new/eng/catalog/](http://www.gsras.ru/new/eng/catalog/)]([http://www.gsras.ru/new/eng/catalog/](http://www.gsras.ru/new/eng/catalog/)), accessed on 1 June 2023). The western sector of the AZRF falls within the responsibility zone of the Kola and Arkhangelsk branches as well as the Central Department of GS RAS. Detailed information on earthquakes in the region is presented in the global ISC catalog ([[http://www.isc.ac.uk/isc-ehb/search/catalogue/](http://www.isc.ac.uk/isc-ehb/search/catalogue/)]([http://www.isc.ac.uk/isc-ehb/search/catalogue/](http://www.isc.ac.uk/isc-ehb/search/catalogue/)), accessed on 1 June 2023). It should be noted that the analysis of earthquake catalogs of GS RAS branches and ISC showed that information about weak earthquakes is mainly contained in regional catalogs. To create a unified (integrated) earthquake catalog of the western sector of the AZRF, the following main tasks were solved:  
* The sequential merging of two regional catalogs of GS RAS, the ISC catalog, and the catalog from [24], identifying duplicates that arise during merging and excluding explosions and other anthropogenic events from the final catalog;
* The unification of magnitude estimates in the integrated catalog by constructing correlation ratios for different types of magnitude/energy class for the same events.