Kharimkotan

Geography & Climate

Kharimkotan is located in Russia, within the Kuril Volcanic Arc of the broader Northwestern Pacific Volcanic Regions. Situated at 49.12° N, 154.51° E in the Northern Hemisphere, the volcano lies within a temperate climate zone. With a summit elevation of 1,145 meters above sea level, Kharimkotan is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a composite, which describes the physical shape and structure of the volcanic edifice as observed from the surface.

Geological Context

Kharimkotan sits in a subduction zone, where one tectonic plate dives beneath another, creating intense heat and pressure that generates magma. Subduction zones are responsible for many of the world's most explosive volcanoes and deadliest eruptions. For communities in Russia near Kharimkotan, this tectonic setting means the volcano is capable of producing powerful explosive eruptions, pyroclastic flows, and lahars that can threaten populated areas within tens of kilometers of the summit. The dominant rock type is andesite / basaltic andesite, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.

Eruption History Summary

Kharimkotan has 6 recorded eruptions in the geological database, spanning from 1713 CE to 1933 CE. The most powerful recorded event was a paroxysmal eruption with devastating regional consequences in 1933 CE, reaching VEI 5 on the Volcanic Explosivity Index. Notable eruptions include 1933 CE (VEI 5), 1883 CE (VEI 3), 1713 CE (VEI 3). This eruption frequency indicates a moderately active volcanic system with periodic reawakenings. The most recent eruption in 1933 CE places this volcano within the modern era of volcanological observation.

Significance

With a maximum recorded VEI of 5, Kharimkotan has demonstrated the capacity for paroxysmal eruptions comparable to the 1980 eruption of Mount St. Helens. Eruptions of this scale can devastate areas within 20-30 kilometers and produce ash fall that disrupts aviation and agriculture across hundreds of kilometers. With 6 recorded eruptions on file, Kharimkotan has enough documented activity to help scientists identify patterns in its eruptive behavior.

GVP Reference Summary

The 8 x 12 km island of Kharimkotan (also spelled Harimkotan) in the northern Kuriles consists of a stratovolcano cut by two breached depressions on the east and NW sides. These horseshoe-shaped craters were formed by slope failure, which produced debris-avalanche deposits that form large broad peninsulas on the east and NW coasts. Evidence of additional slope failures followed by plinian eruptions are found in sea cliffs of the island. Historical explosive eruptions have occurred since the early 18th century. A central cone, Severgin, was largely destroyed during the 1933 eruption, one of the largest in the Kuril Islands during historical time. Impact of a debris avalanche into the sea from the collapse of Severgin produced a tsunami that swept the island's coast and reached Onekotan and Paramushir Islands, killing two people. A large lava dome emplaced during the 1933 eruption now fills the head of the eastern crater.

— Smithsonian Institution, Global Volcanism Program