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Rinjani volcano dominating Lombok island next to Bali forms the second highest peak of the Indonesian volcanoes. It is famous for its beautiful 6 x 8.5 km wide, oval-shaped caldera which contains a 2.5x4.8 km wide lake (Segara Anak) reaching 230 m maximum depth.
Two young cones were built inside the caldera in the eastern part of the caldera, Rombongan and Barujani cones, which is the site of all historic activity, known since 1847, and frequently active. Most eruptions are strombolian type and sometimes form lava flows.
Rinjani is a famous and very rewarding trekking destination.
Explosion at Rinjani volcano (Image: Santanu Bendesa via CNN Indonesia)
A powerful, sudden vulcanian explosion occurred at the volcano Tuesday afternoon (14:45 local time). It originated from the Barujari cinder cone inside the Rinjani caldera and generated a dense column of ash and ejected rock fragments that reached a height of 2000 m. ...more
Part of the eruption column collapsed into pyroclastic flows that reached short distances around the cone (less than 1000 m runout length). The ash plume itself drifted quickly southwest, forcing a temporary closure of Lombok's international airport and some flight disruptions (cancellations), in particular on the popular routes between Australia and Bali. [less]
The volcano has remained calm since yesterday's sudden and very violent explosion. ...more
The attached picture by Rindi Rmaniar on Instagram taken from a few kilometers distance only shows the power of the vulcanian-type explosion: it generated an eruption column several kilometers high, sent ballistic projectiles and pyroclastic flows by collapsing parts of the ash column covering all the slopes of the Baru Jari cone which grew significantly last year. [less]
Today's ash plume from Rinjani volcano in Indonesia
The volcano had a sudden explosive eruption this noon, it seems. An ash plume was detected at 12:20 local time (04:20 UTC) that rose from the volcano to originally estimated 32,000 ft (10 km) altitude and drifted south. ...more
Lombok's Praya Airport was closed today from 16:55 and is expected to reopen tomorrow morning at 10:00 am. It seems likely that the ash plume, which appears not particularly dense and smaller than originally reported by Darwin VAAC, was the result of a sudden explosive event (perhaps phreatic) of the volcano whose last eruption was last year between Oct-Dec. Other causes of the ash plume are possible, too, e.g. a major collapse event inside the caldera. More details will be added as they come in.
It seems that the eruption at the Barujari cone is over. ...more
After a period of intermittent, sometimes quite strong vulcanian-type explosions at the end of Nov and early Dec, no explosive activity has occurred since 3 December and no thermal signal is being recorded on satellite data. [less]
Explosion from Rinjani's Barujari cone on 1 Dec 2015
The volcano continues to erupt, but activity has decreased a lot. When visited during 30 Nov - 2 Dec, "the volcano erupted just 2-3 times eruption per day", but some explosions were fairly big (s. image attached).
The eruption continues with no significant change. When observed yesterday on location, the Barujari cone was in violent strombolian activity and the lava flow was still weakly alimented, creating a small steam plume at the lake entry of the flow. ...more
Impressively, the lake temperature has risen so much that large parts of the surface are steaming. The volcanic activity has been producing only smaller ash plumes during the past days, which did no longer affect air traffic to / from Lombok and Rinjani.
The eruption continues. Ash emissions have decreased recently, with column heights ranging between a few hundred to 2000 meters. On the other hand, mild to moderate strombolian activity from the Barujari cone and the effusion of a new lava flow have been stable and seem to be going on strongly. ...more
This apparent change in eruptive style could be due to a decreasing phreatomagmatic component (water mixing with magma) in the eruption. According to local press, the explosions from the vent reach heights of (only) 50 meters and Gede Suantika, head of the Center for Volcanology and Geological Hazard Mitigation, who is also quoted to say that the eruption is likely to last 3 if not 6 months. On the other hand, in a report from a few days ago, strombolian explosions were mentioned to reach 750 m height.
The new eruption continues with intense strombolian activity and lava effusion from the Barujari intra-caldera cone. Associated ash emissions have been a bit less intense during the past days, although still reached up to 100-200 km length. ...more
After having been closed for two days, Bali's Ngurah Rai International Airport had resumed operations from Thursday at 12:30 local time and flight disruptions due to the ash plume have been limited to individual flight cancellations. [less]
Ash plume over Lombok island this morning (NASA / MODIS)
The eruption of the volcano continues to produce intense ash emissions. However, to the great relief of travelers to and from Bali, the strong easterly winds that had swept the plume over Bali during the past days, forcing the Denpasar International airport to shut down, have ceased and given way to weak southerly and northerly winds, thus allowing the airport to reopen. ...more
Some Australian airlines have been adding extra flights to Bali to help the many stranded travelers return home. On this morning's satellite image, the ash plume can be seen hovering in N-S direction across Lombok island, while Bali was free of ash. However, easterly winds are likely to pick up again soon, which could cause significant flight disruptions again.
Ash emissions from Rinjani on 4 Nov (image: PVMBG team from near the caldera's rim)
Ash plume from Rinjani volcano drifting over Bali today (MODIS / NASA)
The eruption has intensified a lot over the past few days. Activity takes place from a lateral vent on the Barujari cone inside the volcano's caldera, producing continuous ash emissions and feeding a new viscous lava flow. The lava flow has been advancing more than 500 m in two lobes towards the NE. ...more
This current more intense phase of the eruption seems ot have started in the early afternoon of 2 Nov, when ash emissions became large enough to produce a plume that drifted westwards and reached Bali, where the airport of Denpasar was shut down. The plume was almost 400 km long this morning and the shut-down of the airport has been causing significant flight disruptions. When it can be reopened will depend on whether ash emissions continue and the prevailing wind direction in the coming days. On Lombok island itself, the rumblings from the eruptions are heard in many areas. Access to the summit area of Rinjani has been closed and a 3 km exclusion zone around the caldera rim is in place. Several villages on Lombok reported ash falls.
View of the eruption yesterday (image: Ade Adrian / facebook)
Alleged image from this morning's eruption (?), by INFO RINJANI @InfoRinjani / Twitter
A small explosive eruption with ash emissions was reported from the volcano this morning. It seems to have occurred from the Baru Jari cone inside the caldera lake (and the site of all recent eruptions of the volcano) at around 10:45 local time. ...more
Hikers from and near the camp at the lake were evacuated and all trekking routes through the Rinjani National Park were closed, including those through Sembulan and Timbanuh, East Lombok, and Senaru and North Lombok. No significant seismic activity seems to have accompanied the explosion. The ash emission was too small to be detected on satellite data. The aviation alert level of the volcano was raised to Orange (VAAC Darwin). [less]
Rinjani volcano erupted again on Saturday and Sunday (22-23 May, 2010), sending ash to up to 2 km height and causing ash falls in surrounding villages. New reports mention lava flows from the active Baru Jari cone inside the Rinjani caldera into the lake. No fatalities or major damage were reported.
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Bromo volcano photos: Bromo is one of Indonesia's most visited volcanoes. It is the most active vent inside the huge Tengger caldera and erupts every few years.
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