Hiri

Stratovolcano in Indonesia

Key Facts

Elevation

687 m (2,254 ft)

Type

Stratovolcano

Location

0.897°, 127.317°

Region

Halmahera Volcanic Arc

Rock Type

Basalt / Picro-Basalt

Tectonic Setting

Subduction zone

Location

Loading map...

Overview

Hiri is a 3-km-wide forested island immediately north of Gamalama on Ternate Island, and is the northernmost of a chain of volcanic islands off the western coast of Halmahera. Two conical volcanic edifices are present within a larger caldera open to the W. Apandi and Sudana (1980) mapped it as Holocene in age, but no eruptions have been dated or reported.

Volcanic Hazards & Risk Assessment

Primary Hazards

Pyroclastic flows
Lava flows
Volcanic bombs and ballistics
Lahars and mudflows

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

Evidence Credible

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	Unknown	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 Western Pacific Volcanic Regions

Regional Volcanic Activity

The Western 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: 268052
•Evidence: Evidence Credible
•Epoch: Holocene

About the Photo

Hiri (left-center), a small 3-km-wide forested island immediately north of Ternate Island (lower right), is the northernmost of a chain of volcanic islands off the western coast of Halmahera. North is to the upper left in this Space Shuttle image. Little is known of this volcano, although it was mapped as Holocene in age. In contrast to Hiri, the better-known Gamalama volcano that forms Ternate Island has been active during historical time, including a 1775 eruption from the small lake-filled maar visible on the NW coast of the island.

NASA Space Shuttle image STS050-99-95, 1992 (http://eol.jsc.nasa.gov/).