Iliwerung

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 8.53°S
  • 123.57°E

  • 1018 m
    3339 ft

  • 264250
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

28 August-3 September 2013

CVGHM reported that observers at a post 6 km away from Iliwerung reported that diffuse fumarolic emissions from the crater were visible during the mornings from 19 August to 1 September. Seismicity decreased on 19 August and remained at normal levels. On 2 September the Alert Level was lowered to 1 (on a scale of 0-4).

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



 Available Weekly Reports


2013: August
2001: October


28 August-3 September 2013

CVGHM reported that observers at a post 6 km away from Iliwerung reported that diffuse fumarolic emissions from the crater were visible during the mornings from 19 August to 1 September. Seismicity decreased on 19 August and remained at normal levels. On 2 September the Alert Level was lowered to 1 (on a scale of 0-4).

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


14 August-20 August 2013

CVGHM reported that observers at a post 590 m a.s.l. and 6 km away from Iliwerung reported that diffuse fumarolic emissions from the crater were visible during the mornings from 1 to 19 August. Seismicity fluctuated during the month, but 81 shallow volcanic earthquakes were detected between 1606 and 1741 on 19 August, compared to a total of 30 the previous 18 days. The Alert Level was raised to 2 (on a scale of 0-4).

At 0714 on 20 August an eruption from the submarine SE flank vent, Hobal, ejected dense white plumes 2 km a.s.l. that drifted S. Incandescence at sea level was observed at 0746, and the water around the eruption site turned yellow. Fishermen and tourists were not permitted within a 2-km-radius of Hobal.

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


31 October-6 November 2001

An increase in tectonic earthquakes around Iliwerung during 17-26 October led VSI to raise the Alert Level from 1 to 2 (on a scale of 1-4). From 2 to 11 earthquakes were felt per day with Modified Mercalli intensities of I-II. Visual and instrumental monitoring did not show a significant change in volcanic activity.

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


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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1999 May 22 1999 Sep (in or after) Confirmed 0 Historical Observations Hobal (submarine vent on SE flank)
1993 Sep 15 1993 Sep 19 Confirmed 2 Historical Observations Hobal (submarine vent on SE flank)
1983 Aug 17 1983 Aug 18 Confirmed 1 Historical Observations Hobal (submarine vent on SE flank)
[ 1976 Mar 8 ] [ Unknown ] Uncertain 0   Hobal (submarine vent on SE flank)
1973 Dec 5 1974 Aug 22 Confirmed 2 Historical Observations Hobal (submarine vent on SE flank)
1952 Mar 24 Unknown Confirmed 1 Historical Observations
1951 Nov 12 1951 Nov 16 Confirmed 2 Historical Observations
1950 Sep 10 1950 Oct 2 Confirmed 2 Historical Observations
1949 Apr 9 1949 Apr 29 Confirmed 2 Historical Observations
1948 Apr 7 1948 Nov 26 Confirmed 2 Historical Observations East flank (Iligripe)
[ 1941 Jun 5 ] [ Unknown ] Uncertain    
1928 Unknown Confirmed 2 Historical Observations Iliwerung
1910 Unknown Confirmed 2 Historical Observations Iliwerung
1870 Unknown Confirmed 3 Historical Observations Iliwerung (Iliadowajo)

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. 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. Additional discussion of data sources can be found under Volcano Data Criteria.

Kusumadinata K, 1979. Data Dasar Gunungapi Indonesia. Bandung: Volc Surv Indonesia, 820 p.

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

Sudradjat A, 1977. . (pers. comm.).

Constructed on the southern rim of the Lerek caldera, Iliwerung forms a prominent south-facing peninsula on Lembata (formerly Lomblen) Island. Craters and lava domes have formed along N-S and NW-SE lines on the complex volcano; during historical time vents from the summit to the submarine SE flank have been active. The Iliwerung summit lava dome was formed during an eruption in 1870. In 1948 Iligripe lava dome grew on the eastern flank at 120 m altitude. Beginning in 1973-74, when three ephemeral islands were formed, submarine eruptions began on the lower SE flank at a vent named Hobal; several other eruptions took place from this vent before the end of the century.