Arjuno-Welirang

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 7.725°S
  • 112.58°E

  • 3339 m
    10952 ft

  • 263290
  • Latitude
  • Longitude

  • Summit
    Elevation

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    Number

Most Recent Bulletin Report: March 2003 (BGVN 28:03)


Thermal alerts indicate possible activity during August-October 2002

Thermal alerts detected by MODIS within the 2001-2002 period occurred only during August-October 2002 (figure 3) in the summit area. The first alert occurred on 13 August 2002 when a single alert-pixel had an alert ratio of -0.542. On 10 October the anomaly consisted of two alert-pixels with a maximum alert ratio of -0.409, and on 21 October the anomaly was characterized by six alert-pixels (clustered SW of the summit) with a maximum alert ratio of -0.571.

Figure 3. MODIS-detected alerts on Arjuno-Welirang during May-December 2002. Thermal alerts collated by Diego Coppola and David Rothery; data courtesy of the Hawaii Institute of Geophysics and Planetology's MODIS Thermal Alert Team.

The Volcanological Survey of Indonesia reported that the volcano was at Status Level I (no activity) in October 2002. No observations were reported, but only distant tectonic earthquakes were detected at the seismograph station.

An explosive eruption took place in the NW part of Gunung Welirang in October 1950, and eruptive activity was reported on the NW flank (Kawah Plupuh) in August 1952. Steam plumes from the summit of Welirang were photographed from space on 13 September 1991 (BGVN 16:08) and in mid-November 1994.

Information Contacts: Dali Ahmad, Volcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (Email: dali@vsi.esdm.go.id, URL: http://www.vsi.esdm.go.id/); Diego Coppola and David A. Rothery, Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UK (Email: d.coppola@open.ac.uk, d.a.rothery@open.ac.uk). Thermal alerts courtesy of the HIGP MODIS Thermal Alerts Team (URL: http://modis.higp.hawaii.edu/).

The Global Volcanism Program has no Weekly Reports available for Arjuno-Welirang.

Index of Bulletin Reports


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

08/1991 (BGVN 16:08) White plume from Welirang summit

11/1994 (NASA STS 66) Steam plume in mid-November seen from space

03/2003 (BGVN 28:03) Thermal alerts indicate possible activity during August-October 2002




Bulletin Reports

All information contained in these reports is preliminary and subject to change.


08/1991 (BGVN 16:08) White plume from Welirang summit

A plume from the summit area of Welirang . . . was photographed by Space Shuttle astronauts on 13 September at [1535] (photo no. S48-151-064) (figure 1). The dense portion of the apparently ash-poor plume extended roughly 50 km N and more diffuse material continued for another 65 km. The summit area was white and apparently de-vegetated. A plume was observed again on direct video downlink from the spacecraft on [17] September at [1306]. No ground reports were available at press time.

Figure 1. Space Shuttle photograph showing a steam plume from Welirang (just east of the central cloud mass). Also, the lack of vegetation at the peak indicates volcanic activity. Volcanoes on Java form an E-W line of peaks the length of the island; five are in this image. NASA Photo ID: STS048-151-064, 13 September 1991.

Information Contacts: C. Evans and D. Helms, NASA-SSEOP.

11/1994 (NASA STS 66) Steam plume in mid-November seen from space

A photograph taken from the Space Shuttle in mid-November 1994 showed a possible steam plume originating from the summit of Arjuno (figure 2).

Figure 2. This is a striking, oblique view to the south of the Indonesian islands of Java (right), Bali and Lombok (upper left). The linear array of dark regions across the photo is a chain of volcanoes. Plumes of steam can be seen rising from the summits of Arjuno (eastern Java, near the center of the photo) and Merapi (central Java, near the right of the photo). The region appears hazy due to an extended drought over Indonesia, New Guinea, and Australia resulting in huge fires and a regional smoke pall. NASA Photo ID: STS066-154-157. Approximate date: 14 November 1994.

Information Contacts: NASA JSC Digital Image Collection (URL: http://images.jsc.nasa.gov/).

03/2003 (BGVN 28:03) Thermal alerts indicate possible activity during August-October 2002

Thermal alerts detected by MODIS within the 2001-2002 period occurred only during August-October 2002 (figure 3) in the summit area. The first alert occurred on 13 August 2002 when a single alert-pixel had an alert ratio of -0.542. On 10 October the anomaly consisted of two alert-pixels with a maximum alert ratio of -0.409, and on 21 October the anomaly was characterized by six alert-pixels (clustered SW of the summit) with a maximum alert ratio of -0.571.

Figure 3. MODIS-detected alerts on Arjuno-Welirang during May-December 2002. Thermal alerts collated by Diego Coppola and David Rothery; data courtesy of the Hawaii Institute of Geophysics and Planetology's MODIS Thermal Alert Team.

The Volcanological Survey of Indonesia reported that the volcano was at Status Level I (no activity) in October 2002. No observations were reported, but only distant tectonic earthquakes were detected at the seismograph station.

An explosive eruption took place in the NW part of Gunung Welirang in October 1950, and eruptive activity was reported on the NW flank (Kawah Plupuh) in August 1952. Steam plumes from the summit of Welirang were photographed from space on 13 September 1991 (BGVN 16:08) and in mid-November 1994.

Information Contacts: Dali Ahmad, Volcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (Email: dali@vsi.esdm.go.id, URL: http://www.vsi.esdm.go.id/); Diego Coppola and David A. Rothery, Department of Earth Sciences, The Open University, Milton Keynes, MK7 6AA, UK (Email: d.coppola@open.ac.uk, d.a.rothery@open.ac.uk). Thermal alerts courtesy of the HIGP MODIS Thermal Alerts Team (URL: http://modis.higp.hawaii.edu/).

The twin volcanoes of Arjuno and Welirang anchor the SE and NW ends, respectively, of a 6-km-long line of volcanic cones and craters. The Arjuno-Welirang complex overlies two older volcanoes, Gunung Ringgit to the east and Gunung Linting to the south. The summit areas of both volcanoes are unvegetated. Additional pyroclastic cones are located on the north flank of Gunung Welirang and along an E-W-trending line cutting across the southern side of Gunung Arjuno that extends to the lower SE flank. Fumarolic areas with sulfur deposition occur at several locations on Gunung Welirang.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1991 Sep 13 ] [ Unknown ] Uncertain     Gunung Welirang
1952 Aug 15 ± 5 days Unknown Confirmed 0 Historical Observations NW flank (Kawah Plupuh)
1950 Oct 30 Unknown Confirmed 2 Historical Observations NW part of Gunung Welirang (2500 & 2700 m)

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.


Cones

Feature Name Feature Type Elevation Latitude Longitude
Andjasmoro Stratovolcano 2282 m 7° 45' 0" S 112° 32' 0" E
Arjuno
    Ardjoeno
    Widodaren
Stratovolcano 3339 m 7° 46' 0" S 112° 36' 0" E
Bakal Cone - Crater 2985 m
Budugasu, Gunung
    Boedoegasoe, Gunung
Cone
Butak, Gunung
    Boetak, Gunung
Cone 1208 m
Gebug, Gunung
    Geboeg, Gunung
Cone 951 m
Kembar North Cone - Crater 3042 m
Kembar South Cone - Crater 3122 m
Kembar, Gunung Cone 1270 m
Mungker, Gunung
    Moengker, Gunung
Cone
Papa, Gunung Cone 1467 m
Pundak, Gunung
    Poendak, Gunung
Cone 1551 m
Ringgit, Gunung Stratovolcano 2474 m
Wedon, Gunung Cone 659 m
Welirang Stratovolcano 3156 m

Craters

Feature Name Feature Type Elevation Latitude Longitude
Jero
    Djero
Crater
Mati Crater
Plupuh, Kawah Crater
Sumur Bandung Crater
The massive Arjuno-Welirang volcanic complex (left) and the smaller Gunung Penanggungan volcano (right) are seen from the SE across a broad valley from the summit of Tengger caldera. A chain of small cones and craters extends across the Arjuno-Welirang complex, while the flanks of the small Penanggungan stratovolcano are drapped with massive lava flows from satellitic vents.

Photo by Lee Siebert, 1995 (Smithsonian Institution).
The twin volcanoes of Arjuno (right-center) and Welirang (left), seen here rising NE of cultivated land at their feet, anchor the SE and NW ends, respectively, of a 6-km-long line of volcanic cones and craters across a broad valley across from Tengger caldera. A line of pyroclastic cones cuts across the southern flank of Gunung Arjuno and extends to its eastern flank. Fumarolic areas with sulfur deposition occur at several locations on Gunung Welirang.

Anonymous photo.
A complex cluster of craters caps the summit of Gunung Welirang. Kawah Jero crater (upper left) lies behind Tilas Geni crater in the foreground. Steam rises from Kawah Plupuh at the right. This view looks from the north to craters of Gunung Arjuno in the background.

Photo published in Taverne, 1926 "Vulkaanstudien op Java," (courtesy of Volcanological Survey of Indonesia).
Kawah Jero crater is one of many cutting the summit of Gunung Welirang, the northernmost of the twin Arjuno-Welirang stratovolcanoes. A 6-km-long chain of volcanic cones and craters extends NW-SE between the volcanoes.

Photo published in Taverne, 1926 "Vulkaanstudien op Java," (courtesy of Volcanological Survey of Indonesia).
Three young volcanoes in eastern Java are seen in this aerial view from the NE. The Arjuno-Welirang massif lies at the left-center, with 3339-m-high Gunung Arjuno forming the high point of the complex and light-colored Gunung Welirang to the NW (right). In the background is the Kawi-Butak massif, with 2868-m-high Gunung Butak forming the high point and Gunung Kawi to its right. The smaller conical peak of Penanggungan rises above lowlands in the foreground.

Photo by Lee Siebert, 2000 (Smithsonian Institution).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Bronto S, Zaennudin A, Erfan R D, 1985. Geologic map of Arjuno-Welirang volcanoes, East Java. Volc Surv Indonesia, 1:70,000 map.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Katsui Y (ed), 1971. List of the World Active Volcanoes. Volc Soc Japan draft ms, (limited circulation), 160 p.

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

Taverne N J M, 1926. Vulkanstudien op Java. Vulk Meded, 7: 1-132.

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

Volcano Types

Stratovolcano
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
2,584
53,983
4,143,137
25,385,433

Affiliated Databases

Large Eruptions of Arjuno-Welirang 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).
WOVOdat 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.
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).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.