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This study examines the thermal control of the lower boundary of seismicity in the Lena Delta, eastern Russian Arctic, using the depth distribution of local earthquakes recorded by temporary seismic networks in 2016–2018 together with temperature–depth curves derived from crustal heat-flow modeling. This study contributes by comparing the observed lower cutoff of local seismicity with modeled crustal temperatures, thereby adding a seismological constraint to previous seismic, thermal, and magnetic interpretati...