Permafrost Depth in Russia & Former Soviet Republics: Up to 1.65 km

In Russia and the post-Soviet republics, permafrost (perennially frozen ground) underlies ~65% of Russian territory and extends to extraordinary depths.

Maximum Depths

• Typical maximum: 500–800 m (Western Siberia, Central Yakutia).
• Deepest recorded: 1,650 meters (5,413 ft) at Vilyuy River basin, Siberia (near Mirny diamond mine).
• General range: 200 m (southern limit) → 1,500+ m (coldest cores).

Origin & Persistence

• Relict of Last Glacial Maximum (LGM, ~20 ka): Ice sheets insulated ground; deep cold penetrated. As ice retreated, surface warmed but deep cold remained trapped by low geothermal gradient (~0.03°C/m) and insulating peat/ice wedges.
• Thermal inertia: Takes millennia to thaw from top down.

Impacts

• Infrastructure: Buildings/roads on piles (thermosyphons), not foundations. Thaw = collapse (Norilsk, Yakutsk).
• Carbon: ~1,500 Gt organic carbon stored – thaw releases CO₂/CH₄ (permafrost carbon feedback).
• Ecosystems: Thermokarst lakes, drunken forests, altered hydrology.
• Resource Extraction: Pipelines (e.g., Yamal–Europe) elevated/refrigerated. Diamond mines (Mir, Udachnaya) use freezing plants.

Monitoring

Russian Roshydromet + Permafrost Observatory Network (CALM sites). Warming: +0.5–2°C at 10–20m depth since 1970s. Active layer thickening.