Global Volcanism Program

The Global Volcanism Program has no activity reports available for Poco Leok.

The Global Volcanism Program has no Weekly Reports available for Poco Leok.

The Global Volcanism Program has no Bulletin Reports available for Poco Leok.

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude

264070

Pleistocene

1,675 m / 5,495 ft

8.68°S
120.48°E

Morphology

Volcano Landform
Composite

Volcano Types
Stratovolcano
Caldera

Rock Types

Major
Andesite / Basaltic Andesite
Dacite

Tectonic Setting

Subduction zone
Crustal thickness unknown

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km

653
47,055
270,617
862,807

Geological Summary

Poco Leok in western Flores Island consists of a heavily dissected edifice with a central 3-km-wide central caldera-like depression of uncertain origin. No pyroclastic-flow deposits are associated with the volcano, which is poorly known geologically (Casadevall, 1989, pers. comm.). There is andesite lava within the crater area, which Mahon and others (1992) attributed to the volcanic group immediately north. Volcanism is of Quaternary age (van Bemmelen, 1949), and four fumarole fields are located at elevations of 825-1,200 m within the depression. The Ulumbu geothermal field is located on its flank at 650 m elevation and includes hot springs, fumaroles, mud pots, and steaming ground.

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Casadevall T J, 1989. (pers. comm.).

Kasbani, Browne P R L, Johnstone R D, Kahsai K, Utami P, Wangge A, 1997. Subsurface hydrothermal alteration in the Ulumbu geothermal field, Flores, Indonesia. Proc 22nd Workshop Geotherm Res Eng, Stanford Univ, 1997, 7 p.

Kemmerling G L L, 1929. Vulkanen van Flores. Vulk Seism Meded Dienst Mijnw Ned-Indie, 10: 1-138.

Neumann van Padang M, 1951. Indonesia. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 1: 1-271.

Sulasdi D, 1996. Exploration of Ulumbu geothermal field, Flores-East Nusa Tenggara Indonesia. Proc 21st Workshop Geotherm Res Eng, Stanford Univ, Jan 22-24, 1996, SGP-TR-151: 51-54.

van Bemmelen R W, 1949. The Geology of Indonesia. The Hague: Government Printing Office, v 1, 732 p.

Eruptive History

The Global Volcanism Program is not aware of any Holocene eruptions from Poco Leok. If this volcano has had large eruptions (VEI >= 4) prior to 12,000 years ago, information might be found on the Poco Leok page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Synonyms

Potjo Leok | Potjok Leok

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Poco Rii

Stratovolcano

Thermal

Feature Name

Feature Type

Elevation

Latitude

Longitude

Ine Rua

Thermal

Kokor, Wai

Thermal

Mucu
Mutju

Thermal

Ulumbu

Thermal

650 m

Wara, Wai

Thermal

Photo Gallery

The Global Volcanism Program has no photographs available for Poco Leok.

Smithsonian Sample Collections Database

There are no samples for Poco Leok in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites

Copernicus Browser

The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions.

WOVOdat
   Single Volcano View
   Temporal Evolution of Unrest
   Side by Side Volcanoes

WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.

GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments.

IRIS seismic stations/networks

Incorporated Research Institutions for Seismology (IRIS) Data Services map showing the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of Poco Leok. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice.

UNAVCO GPS/GNSS stations

Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of Poco Leok. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player.

Large Eruptions of Poco Leok

Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

EarthChem

EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).