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Ranakah

Lava dome(s) in Indonesia

Last Eruption: 1991

Key Facts

Elevation

2,288 m (7,507 ft)

Type

Lava dome(s)

Location

-8.637°, 120.530°

Region

Sunda Volcanic Arc

Rock Type

Andesite / Basaltic Andesite

Tectonic Setting

Subduction zone

Location

Loading map...

Overview

The Anak Ranakah (Child of Ranakah) lava dome was formed in 1987 in an area without previous recorded eruptions at the base of the large older lava dome of Gunung Ranakah. An arcuate group of lava domes extending about 12 km west from Gunung Ranakah to Poco Mandosawa occurs on the outer N flanks of the poorly known Poco Leok caldera on western Flores Island.

Volcanic Hazards & Risk Assessment

Primary Hazards

    Risk Level

    Population at RiskModerate
    Infrastructure RiskHigh
    Aviation RiskSignificant

    Geological Composition & Structure

    Rock Types

    Primary
    Andesite / Basaltic Andesite
    Silica Content
    Intermediate (57-63% 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 Observed

    Eruption Statistics & Analysis

    MetricValueGlobal RankingSignificance
    Total Recorded EruptionsUnknownLowModerately active volcano
    Maximum VEIVEI UnknownMinorLocal impact potential
    Recent Activity35 years agoRecentRecently active

    Monitoring & Alert Status

    Monitoring Networks

    Global Volcanism Program
    International eruption database

    Current Status

    Watch
    Dormant but monitored. Capable of renewed activity.

    Nearby Volcanoes in Sunda-Banda Volcanic Regions

    Regional Volcanic Activity
    The Sunda-Banda 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: 264071
    • Evidence: Eruption Observed
    • Epoch: Holocene

    About the Photo

    A new lava dome, Anak Ranakah (center), formed in 1987 on the outer flanks of the poorly known Poco Leok caldera on western Flores Island. The new dome is located in an area without previous historical eruptions at the base of the large older lava dome, Gunung Ranakah. Anak Ranakah, seen here from the SW, is part of an arcuate group of lava domes extending westward from Gunung Ranakah.

    Photo by Willem Rohi, 1988 (Volcanological Survey of Indonesia).

    Basic Information

    This page shows basic data from the Smithsonian Global Volcanism Program. For more detailed information, visit the official Smithsonian page.