Tangkoko-Duasudara

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 1.518°N
  • 125.185°E

  • 1334 m
    4376 ft

  • 266130
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Weekly Report: 21 April-27 April 2010 Citation IconCite this Report


Based on analyses of satellite imagery, the Darwin VAAC reported that on 23 April a possible ash plume from Tongkoko rose to an altitude of 10.7 km (35,000 ft) a.s.l. [Note: The Darwin VAAC later stated that, according to CVGHM, the plume was caused by a fire and not an eruption.]

Source: Darwin Volcanic Ash Advisory Centre (VAAC)


Most Recent Bulletin Report: September 2003 (BGVN 28:09) Citation IconCite this Report


Volcanic earthquakes during October 2002-January 2003

The Volcanological Survey of Indonesia (VSI) reported deep volcanic and A-type earthquakes at Tongkoko (also known as Tangkoko) over the period 7 October-24 November 2002 and more deep-volcanic events during 23 December 2002-19 January 2003 (table 1). The earthquakes, which began in May 2002, were recorded following relocation of an observatory post to Wainenet village in the Bitung area. The temperature at Batu Angus hot spring on 10 October 2002 was 70-73°C. While no visible activity has been observed, the hazard status was raised to Alert Level 2 (on a scale of 1-4) on 24 October 2002 as a result of the increased seismicity. The last recorded activity at Tongkoko consisted of flank lava flows and lava dome extrusion in 1880.

Table 1. Earthquakes recorded at Tongkoko, 7 October 2002-19 January 2003. In addition, one shallow volcanic event was recorded during 13-19 January 2003, and single B-type earthquakes each occurred during 21-27 October and 4-10 November 2002. Courtesy of VSI.

[Skip text table]
    Date (2002-03)     Deep      A-type     Tectonic
                     Volcanic

    07 Oct-13 Oct        4         --          --
    14 Oct-20 Oct       --         12          23
    21 Oct-27 Oct       --          9          34
    28 Oct-03 Nov       --         17          19
    04 Nov-10 Nov       --          9          38
    11 Nov-18 Nov       --          2          37
    19 Nov-24 Nov       --          2          25
    23 Dec-29 Dec        5         --          16
    06 Jan-12 Jan       11         --          21
    13 Jan-19 Jan        5         --          28

Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani, and Suswati, 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/).

Weekly Reports - Index


2010: April
2002: October


21 April-27 April 2010 Citation IconCite this Report


Based on analyses of satellite imagery, the Darwin VAAC reported that on 23 April a possible ash plume from Tongkoko rose to an altitude of 10.7 km (35,000 ft) a.s.l. [Note: The Darwin VAAC later stated that, according to CVGHM, the plume was caused by a fire and not an eruption.]

Source: Darwin Volcanic Ash Advisory Centre (VAAC)


30 October-5 November 2002 Citation IconCite this Report


An increase in the number of volcanic earthquakes at Tongkoko since 24 October led VSI to raise the Alert Level from 1 to 2. The number of deep volcanic earthquakes decreased in comparison to the previous week. VSI reported that the increased number of shallow volcanic earthquakes indicated that seismicity was migrating to the surface.

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


16 October-22 October 2002 Citation IconCite this Report


Relocation of an observatory to the area near Tongkoko provided scientists with previously unavailable seismic data. During 7-14 October, four deep-volcanic events were recorded at Tongkoko. This is significant because the volcano has been in repose for almost 122 years. Tongkoko was at Alert Level 1 (on a scale of 1-4) (note: VSI later corrected Alert Level from 2).

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.

09/2003 (BGVN 28:09) Volcanic earthquakes during October 2002-January 2003




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


September 2003 (BGVN 28:09) Citation IconCite this Report


Volcanic earthquakes during October 2002-January 2003

The Volcanological Survey of Indonesia (VSI) reported deep volcanic and A-type earthquakes at Tongkoko (also known as Tangkoko) over the period 7 October-24 November 2002 and more deep-volcanic events during 23 December 2002-19 January 2003 (table 1). The earthquakes, which began in May 2002, were recorded following relocation of an observatory post to Wainenet village in the Bitung area. The temperature at Batu Angus hot spring on 10 October 2002 was 70-73°C. While no visible activity has been observed, the hazard status was raised to Alert Level 2 (on a scale of 1-4) on 24 October 2002 as a result of the increased seismicity. The last recorded activity at Tongkoko consisted of flank lava flows and lava dome extrusion in 1880.

Table 1. Earthquakes recorded at Tongkoko, 7 October 2002-19 January 2003. In addition, one shallow volcanic event was recorded during 13-19 January 2003, and single B-type earthquakes each occurred during 21-27 October and 4-10 November 2002. Courtesy of VSI.

[Skip text table]
    Date (2002-03)     Deep      A-type     Tectonic
                     Volcanic

    07 Oct-13 Oct        4         --          --
    14 Oct-20 Oct       --         12          23
    21 Oct-27 Oct       --          9          34
    28 Oct-03 Nov       --         17          19
    04 Nov-10 Nov       --          9          38
    11 Nov-18 Nov       --          2          37
    19 Nov-24 Nov       --          2          25
    23 Dec-29 Dec        5         --          16
    06 Jan-12 Jan       11         --          21
    13 Jan-19 Jan        5         --          28

Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani, and Suswati, 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/).

Eruptive History


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


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1880 Unknown Confirmed 1 Historical Observations Batu Angus
1843 1846 Confirmed 2 Historical Observations Batu Angus
1821 Unknown Confirmed 0 Historical Observations Batu Angus Baru
1801 Unknown Confirmed 2 Historical Observations Summit and east flank (Batu Angus)
1694 Unknown Confirmed 3 Historical Observations
1683 Unknown Confirmed 3 Historical Observations
1680 Unknown Confirmed 5 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


The 1149-m-high elongated Tongkoko volcano, seen in this composite photo from the south, rises above Bitung city and is the NE-most volcano on the island of Sulawesi. The summit of the volcano, which is elongated in a NW-SE direction, contains a large crater with a central cone. Historical eruptions have occurred since 1680 from both the summit and an east flank vent, Batu Angus. Tongkoko volcano and its neighbor Dua Saudara are the most prominent features of Gunung Dua Saudara National Park, a noted wildlife preserve.

Photo by A.R. Sumailani, 1973 (Volcanological Survey of Indonesia).
See title for photo information.
The forested summit of Tongkoko volcano at the NE tip of Sulawesi is truncated by a large elongated, 1 x 2 km wide crater that contains a central cone. In 1801 a crater lake was observed. Eruptions have occurred at Tongkoko during historical time from both summit and flank craters.

Photo by A.R. Sumailani, 1973 (Volcanological Survey of Indonesia).
See title for photo information.
The flat-topped Batu Angus lava dome formed on the east flank of Tongkoko volcano during an eruption in 1801. A lava flow traveled 2 km down the flank. The 1801 eruption also included formation of small cones at the bottom of the crater lake at the summit of the volcano.

Photo by A.R. Sumailani, 1973 (Volcanological Survey of Indonesia).
See title for photo information.
Tongkoko volcano, seen here from Lembe Island to the east, is a broad, 1149-m-high stratovolcano capped by a large summit crater. The lava dome Batu Angus, which formed in an eruption in 1801, can be seen on the east flank of the volcano in the center of the photo. Gunung Dua Saudara National Park, a noted wildlife preserve, extends from the volcanic highlands to offshore coral reefs.

Photo by Ruska Hadian (Volcanological Survey of Indonesia).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites