Tolmachev Dol

Pyroclastic cone(s) in Russia

Last Eruption: 300

Key Facts

Elevation

1,021 m (3,350 ft)

Type

Pyroclastic cone(s)

Location

52.630°, 157.580°

Region

Kuril Volcanic Arc

Rock Type

Basalt / Picro-Basalt

Tectonic Setting

Subduction zone

Location

Loading map...

Overview

Tolmachev Dol (Tomachev Plateau) is broad volcanic highland NE of Opala volcano that includes numerous late-Pleistocene and Holocene cinder cones and associated lava flows. The cones and lava fields cover a broad area on both sides of Lake Tolmachev, which lies in large depression halfway between Opala and Gorely volcanoes. The Pleistocene Tolmachev stratovolcano lies on the SE side of the lake.

A major explosive eruption took place about 4,600 years ago from Chasha crater in the northern part of the plateau, during which about 1 km3 of rhyolitic tephra was ejected. The latest dated eruption occurred from a cinder cone in the NW part of the plateau about 1,600-1,700 years ago.

Volcanic Hazards & Risk Assessment

Primary Hazards

Risk Level

Population at RiskModerate

Infrastructure RiskModerate

Aviation RiskSignificant

Geological Composition & Structure

Rock Types

Primary

Basalt / Picro-Basalt

Silica Content

Low (45-52% SiO₂)

Tectonic Setting

Subduction zone

Formed by oceanic plate subduction, typically producing explosive eruptions due to water-rich magmas.

Age & Formation

Epoch

Holocene

Evidence

Eruption Dated

Eruption Statistics & Analysis

Metric	Value	Global Ranking	Significance
Total Recorded Eruptions	Unknown	Low	Moderately active volcano
Maximum VEI	VEI Unknown	Minor	Local impact potential
Recent Activity	1726 years ago	Historical	Historically active

Monitoring & Alert Status

Monitoring Networks

Global Volcanism Program

International eruption database

Current Status

Normal

No recent activity. Routine monitoring continues.

Nearby Volcanoes in Northwestern Pacific Volcanic Regions

Regional Volcanic Activity

The Northwestern Pacific Volcanic Regions contains multiple active volcanic systems. Cross-regional magma interactions and tectonic stresses can influence eruption patterns across the entire arc. Monitor regional seismic activity and volcanic alerts.

Quick Info

•Smithsonian ID: 300082
•Evidence: Eruption Dated
•Epoch: Holocene

About the Photo

Late Pleistocene-Holocene scoria cones in the foreground are located on the southern part of Tolmachev Dol (Tolmachev Plateau) with Opala volcano in the background. Tolmachev Dol is a large volcanic highland NE of Opala that contains numerous postglacial scoria cones. The cones and associated lava fields cover a broad area around Lake Tolmachev halfway between Opala and Gorely.

Copyrighted photo by Leopold Sulerzhitsky (Holocene Kamchataka volcanoes; http://www.kscnet.ru/ivs/volcanoes/holocene/main/main.htm).