Seismicity regime study: A case of Selenge province, northern Mongolia
DOI:
https://doi.org/10.5564/mjag.v12i1.5197Keywords:
Earthquake, magnitude, seismic activity, recurrenceAbstract
Selenge Province, located in northern Mongolia, lies within the transition zone between the Baikal rift and the Khuvsgul–Darkhad basins, where regional extensional tectonics and seismic activity are closely interrelated. The aim of this study is to evaluate the seismic regime of the region by statistically analyzing the seismic activity and recurrence characteristics. The analysis is based on the earthquake catalog of the National Data Center of the Institute of Astronomy and Geophysics (IAG), covering the period from 1900 to 2024, which includes 6603 events recorded. The strongest earthquake in the study area is the Mw6.3 Khiagt event of February 6, 1957, followed by Mw5.7 (1989) and Mw 5.1 (2017, 2020) earthquakes, indicating a reactivation of the seismogenic zone. Using the Gutenberg–Richter relationship, , the seismicity parameters were determined by linear regression. The results show that for Selenge Province and indicating a moderately active and relatively stable region, yet with a potential for the recurrence of strong earthquakes. Statistical estimates suggest that events of Mw ≥ 5.0 may occur approximately once every 10–15 years. These findings provide a valuable basis for improving the seismic hazard assessment and microzonation studies in northern Mongolia.
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