What kind of volcano is 岩手山?

岩手山 is classified as a Complex in Japan. Its tectonic setting is Subduction zone / Continental crust (> 25 km).

How is seismicity near 岩手山 monitored here?

Earthquakes within 50 km of the crater are aggregated from 18 seismic networks and checked against a swarm rule that compares the current rate with this volcano's own 30-day background. Ash advisories come from the VAAC centres that are connected.

Snow-streaked cone of Mount Iwate rising above Morioka, Japan

Photo:Lee Siebertvia Smithsonian GVP

Volcano Dossier•GVP #283240

39.85°N, 141.00°E

Erupted in the 20th century

日本→

Volcano 岩手山

「南部片富士」と呼ばれる標高2,038 mの成層火山で、盛岡市を見下ろしています。1732年の焼走り溶岩流は今も植生が乏しく、国の特別天然記念物に指定されています。1998年には群発地震と山体膨張で登山道が何年も閉鎖され、これを機に日本で最も綿密に監視される火山の一つになりました。

Last Eruption

1919

Erupted in the 20th century

Summit Elevation

2.0 km

複合火山 · 玄武岩 / ピクロ玄武岩

Seismic State

Normal Baseline

0 events (1.0x rate)

Interactive Volcano & Seismicity Map

Seismicity within 50 km radius, active VAAC ash plumes, and tectonic plate boundaries.

Recent seismicity within 50 km

0 events in the last 12 h within 25 km of the crater.

時刻	マグニチュード	震央・場所	距離	震源の深さ
3d 前	M4.3	15 km NNE of Semboku, Japan	19 km	120.4 km
56d 前	M2.7	秋田県内陸北部, Japan	38 km	10 km
63d 前	M3.5	EASTERN HONSHU, JAPAN (JMA)	38 km	10 km

Geological & Tectonic Profile

複合火山

岩手山 is an active Complex formed in an active Subduction zone / Continental crust (> 25 km). Dominant lithology: Basalt / Picro-Basalt.

Edifice Type複合火山

Major Rock玄武岩 / ピクロ玄武岩

Tectonic Setting沈み込み帯

Volcanic Arc東北日本火山弧

Volcanic Dossier

VN #283240

Official catalogue parameters, coordinates, elevation and geotectonic classification.

国日本

火口の座標39.853°, 141.001°

Summit Elevation2.0 km

Subregion東北日本火山弧

Catalog SourceSmithsonian GVP (#283240)

Authoritative Monitoring Infrastructure

All 18 Networks & VAAC →

Seismic ObservatoryJMA

Japan Meteorological Agency (Volcano Observation)

Official Portal

ICAO Aviation Ash Center

Tokyo VAAC (JMA)

Tokyo, Japan

VAAC Advisory Desk

Swarm telemetry correlated across 18 networks against a 30-day baseline.Read Science & Physics →

地域地震プロファイル

三陸・東北海岸

Explore live seismic monitoring, historical danger benchmarks, fault slip models and recurrence intervals for 三陸・東北海岸.

地域ハブを開く

よくあるご質問（FAQ）

検証済みの科学的・運用面・緊急対応プロトコル

The most recent eruption of 岩手山 recorded by the Smithsonian Global Volcanism Program was in 1919.

Catalogue: Smithsonian Institution, Global Volcanism Program.Smithsonian GVP profile