Semeru volcano (East Java): lava flow from growing dome
Wed, 23 Jul 2014, 14:1514:15 PM | BY: T
Glow from Semeru's summit at night (VSI webcam)
Progression of a presumed lava flow (thermal anomaly) on the SE slope (Images: ASTER/GSJ, compiled and annotated by Culture Volcan)
Activity, weak during the past months, seems to have picked up. A new lava flow has started to slowly descend the southeastern slope.
Comparison of Semeru's crater from 2011, 2012, and 2014 showing the slow growth of a lava dome with its new lobe (r) (images: Aris Yanto /Ndeso Adventures)
Since the intense explosive phase of activity in February 2012, accompanied by pyroclastic flows down the southern slope, a lava dome has been growing slowly inside the breached summit crater. This dome now started to form a more or less coherent lava lobe that began descending through the notch onto the upper southern slope. Weak glow is visible at night.
As a comparison of satellite images between 7 June and 16 July, compiled by Culture Volcan shows the progression of a tongue of hot material inside the ravine, likely a lava flow reaching 1,5-2 km length.
The presence of this flow has been causing almost constant rockfalls from the front of the flow into the Kembar ravine.
Lava flows are not uncommon at Semeru. Other recent ones occurred in 2010 and in March 2012.
Links / Sources:
Links / Sources:
- La coulée du volcan Semeru(Culture Volcan)
Fri, 18 Oct 2013, 13:02
A pilot observed a small ash eruption this morning. The volcano had recently been very calm, but this could be a sign it is getting more active again. ... read all
Wed, 25 Jul 2012, 07:58
Tue, 8 May 2012, 10:05
CVGHM reported that during 1-29 February multiple pyroclastic flows from Semeru traveled 500 and 2,500 m into the Besuk Kembar and Besuk Kobokan rivers (on the S flank), respectively. During 1 February-30 April dense gray-to-white plumes rose 100-500 m above Jongring Seloko crater and drifted W and N. Incandescence was visible up to 50 m above the crater during 1 February-31 March. Seismicity decreased from March to April. Observations indicated that the lava dome grew in April. On 2 May CVGHM lowered the Alert Level to 2 (on a scale of 1-4) and reminded the public not to approach the crater within a 4-km radius. read all
Thu, 29 Mar 2012, 10:05
Our expedition leader Doni just returned from a visit to Semeru and reports that on 27 March, he and our group observed frequent explosions every few minutes, with many powerful enough to eject glowing bombs to produce small glowing avalanches down on the southern flank of the volcano. ... read all
Mon, 6 Feb 2012, 11:30
A slight increase in activity of Semeru volcano's activity has been observed by the Indonesian Geological Survey in recent weeks and its alert level was raised to 3 (out of 4, "watch") on 3 February 2012, after it had been on level 2 since 16 July 2009. ... read all