Earthquakes in the Eastern Sector of the Russian Arctic in the First Half of the 20th Century

The parameters of earthquakes recorded in the Arctic region during the early 20th century and calculated by researchers in the first half of the century continue to be used in modern seismic event catalogs. However, these hypocentral parameters are predominantly computed based on bulletins compiled only from a subset of the seismic stations operated during that period, utilizing outdated velocity models and location algorithms, which restricts their accuracy and reliability. This study presents a consolidated catalog of all earthquakes recorded between 1900 and 1950 within the geographic region bounded by 70.0° to 90.0° N latitude and 70.0° E to 170.0° W longitude. Using the most comprehensive set of instrumental data, a modern velocity model, and a location algorithm adapted for early instrumental earthquakes, a refined catalog of earthquakes was compiled for the eastern sector of the Russian Arctic during the first half of the 20th century. Additionally, a secondary catalog was developed for earthquakes attributed to the region in various sources. However, after recalculating the epicentral coordinates, these events were excluded from the considered area. A total of 19 earthquakes were recorded within the study area, with magnitudes (Mw) ranging from 5.2 to 6.9, primarily associated with the Gakkel Ridge and its continuation on the Laptev Sea shelf, as well as the continental portion of northern Yakutia. The results of this study can be used to refine seismic regime parameters, develop geodynamic models, and investigate the stress–strain state of the Earth’s crust. Furthermore, these results may be applied to address safety concerns in the operation of industrial systems and facilities during the exploration of major deposits in the eastern sector of the Russian Arctic.