Sorikmarapi

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.686°N
  • 99.539°E

  • 2145 m
    7036 ft

  • 261120
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Weekly Report: 28 December-3 January 2012 Citation IconCite this Report


CVGHM lowered the Alert Level for Sorikmarapi on 30 December from 2 to 1 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)


Most Recent Bulletin Report: August 1996 (BGVN 21:08) Citation IconCite this Report


During May, "smoke" in vicinity reaches 10-km altitude

On the morning of 5 May 1996, Qantas Airlines reported "smoke" over Sumatra near Sorikmarapi to just above 10 km altitude. However, in a satellite pass about 2 hours earlier there was no evidence of an eruption.

Information Contacts: Bureau of Meteorology, Northern Territory Regional Office, P.O. Box 735, Darwin NT 0801, Australia.

Weekly Reports - Index


2011: December


28 December-3 January 2012 Citation IconCite this Report


CVGHM lowered the Alert Level for Sorikmarapi on 30 December from 2 to 1 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)


7 December-13 December 2011 Citation IconCite this Report


CVGHM reported increased seismicity from Sorik Marapi during 1-12 December and white plumes rose 40-50 m above the summit. CVGHM raised the Alert Level on 12 December from 1 to 2 (on a scale of 1-4) based on seismic data.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)


Bulletin Reports - Index


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.

06/1986 (SEAN 11:06) Dark ash plume

07/1986 (SEAN 11:07) No new explosions

08/1987 (SEAN 12:08) Seismicity and fumarole temperatures increase

07/1989 (SEAN 14:07) Thermal activity; no shallow seismicity

12/1989 (GV11 89:12) Phreatic explosion ejects mud

08/1996 (BGVN 21:08) During May, "smoke" in vicinity reaches 10-km altitude




Information is preliminary and subject to change. All times are local (unless otherwise noted)


June 1986 (SEAN 11:06) Citation IconCite this Report


Dark ash plume

. . . on 5 July at 1520, a large dark ash plume was observed from Sibangor Tonga observation post. No additional explosions were recorded on 5 or 6 July.

Information Contacts: L. Pardyanto, Olas, Kaswanda, A. Sudradjat, and T. Casadevall, VSI.


July 1986 (SEAN 11:07) Citation IconCite this Report


No new explosions

The ash plume from the 5 July explosion reached 700 m above the summit. No additional explosions have been recorded.

Information Contacts: L. Pardyanto, Olas, Kaswanda, Suratman, A. Sudradjat, and T. Casadevall, VSI.


August 1987 (SEAN 12:08) Citation IconCite this Report


Seismicity and fumarole temperatures increase

Temperatures increased at two fumaroles during August: from 104 to 197°C at the N crater, and from 95 to 108°C at Sibangor Julu. White fume was almost continuously present, rising to ~100 m above the crater. In late August, seismic activity began to increase. By early September, near-surface earthquakes averaged ~7/day and deeper, tectonic earthquakes averaged ~40/day.

Information Contacts: VSI.


July 1989 (SEAN 14:07) Citation IconCite this Report


Thermal activity; no shallow seismicity

Normal activity continued in late July, with a weak gas plume reaching 5-10 m above the crater. The temperature of the crater solfatara was 185-190°C, while two surrounding solfataric areas measured 108-110°C and 97-115°C. Twenty-nine tectonic earthquakes (but no volcanic shocks) were recorded.

Information Contacts: VSI.


December 1989 (GV11 89:12)


Phreatic explosion ejects mud

[A single phreatic explosion rose 25 m above the Sibangor Tonga crater, spreading mud in a 5-m radius.]

Information Contacts: VSI.


August 1996 (BGVN 21:08) Citation IconCite this Report


During May, "smoke" in vicinity reaches 10-km altitude

On the morning of 5 May 1996, Qantas Airlines reported "smoke" over Sumatra near Sorikmarapi to just above 10 km altitude. However, in a satellite pass about 2 hours earlier there was no evidence of an eruption.

Information Contacts: Bureau of Meteorology, Northern Territory Regional Office, P.O. Box 735, Darwin NT 0801, Australia.

Eruptive History


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


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1996 May 5 ] [ Unknown ] Uncertain    
1986 Jul 5 1986 Jul 14 Confirmed 1 Historical Observations
1970 Jul 2 ± 182 days Unknown Confirmed 2 Historical Observations
1917 May 20 1917 May 20 Confirmed 2 Historical Observations
1893 Jan 4 1893 Jan 4 Confirmed 2 Historical Observations East flank (Sibanggor Julu)
1892 May 21 Unknown Confirmed 2 Historical Observations Summit and east flank (Jurang Siunik)
[ 1888 Feb ] [ Unknown ] Uncertain    
1879 Unknown Confirmed 2 Historical Observations
[ 1866 ] [ Unknown ] Uncertain    
1829 (?) Unknown Confirmed 2 Historical Observations

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.

Photo Gallery


Sorikmarapi, seen here from the west, is a forested stratovolcano with a steep-sided, 600-m-wide summit crater containing a crater lake and substantial sulfur deposits. Another crater lake is located on the upper SE flank and several small explosion craters occur within the main crater and on the outer flanks. Small explosive eruptions have been documented from summit and flank vents in the 19th and 20th centuries.

Photo by Tom Casadevall, 1987 (U.S. Geological Survey).
See title for photo information.
Sorikmarapi volcano rises above older mountains that have impeded its growth to the north. The truncated summit contains a crater lake and a chain of smaller NW-SE-trending craters. Historical eruptions have been recorded from both summit and flank vents since the 19th century.

Anonymous photo, 1991.
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites