Available Weekly Reports
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.
Sources: Center of Volcanology and Geological Hazard Mitigation (CVGHM)
31 October 2001Back to Top
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||Hobal (submarine vent on SE flank)|
|1993 Sep 15||1993 Sep 19||Confirmed||2||Historical||Hobal (submarine vent on SE flank)|
|1983 Aug 17||1983 Aug 18||Confirmed||1||Historical||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||0||Historical||Hobal (submarine vent on SE flank)|
|1952 Mar 24||Unknown||Confirmed||1||Historical|
|1951 Nov 12||1951 Nov 16||Confirmed||2||Historical|
|1950 Sep 10||1950 Oct 2||Confirmed||2||Historical|
|1949 Apr 9||1949 Apr 29||Confirmed||2||Historical|
|1948 Apr 7||1948 Nov 26||Confirmed||2||Historical||East flank (Iligripe)|
|[ 1941 Jun 5 ]||[ Unknown ]||Uncertain|
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.