Semeru volcano (East Java, Indonesia): alert level raised to 3 due to an increase of activity
Monday Feb 06, 2012 12:30 PM | BY: TP
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.
Only small to moderate eruptions had been occurring over most of the past year. Between 29 December and 15 January, 8 explosions were counted which produced ash clouds up to 600 m high. One explosion threw incandescent bombs to a distance of 300 m from the Jonggring Seloko crater. During 15-29 January, only weak explosions were recorded and a small steam and ash plume rising 25-50 m was observed.
Between 30 and 31 January, 5 explosions were recorded. They produced incandescent fallout in up to 400 m distance. On 2 February at 07:47 local time, a stronger explosion produced incandescent bombs that reached 750 m distance and caused a small avalanche of blocks rolling down a distance of up to 2.5 km (note: no pyroclastic flows). The heightened activity triggered the raise in alert level the following day.
At its present status level of 3, PVMBG recommends to stay away at least 4 km from the summit on the SE side of the volcano and climbers are advised not to approach the Jonggring Seloko crater less than 1 km.
As of 6 February, no significant changes to its activity have been reported by our correspondent on location.
Links / Sources:
Thursday, Sep 15, 2011
Our group traveling in East Java just returned from a visit to Semeru volcano and sends the following report: an active lava dome is growing inside the crater and there are 3-4 eruptions per day, and it seems that the size and frequency is increasing in the past days. [more]
Tuesday, May 17, 2011
As observed during a photo expedition in May, Semeru's activity consisted of a few small to medium ash explosions per day, and over the past weeks, it has been increasing. Access to the summit is open for climbers. [more]
Friday, Oct 31, 2008
The Darwin VAAC reported that a ash plume from Semeru that rose to an altitude of 4.3 km and drifted WSW on 22 October. [more]
Monday, Oct 20, 2008
I was on a flight yesyerday from Jember to Surabaya with 2 friends and saw Mt Semeru explode at app. 09.37 on the 18 Oct 2008. We were about 20 km from the mountain when I noticed the the top had a small gray mushroom at the top with in a minute or so i was extremley greater in size. I would not be able to guess how high it rose but it was larger than the clouds around. I'm just sending this message as I did not read anything in the news. ... [more]
Thursday, Jun 12, 2008
Small pyroclastic flows and rockfall avalanches have been observed at Semeru since 22 May. The pyroclastic flows travelled a maximum distance of 2.5 km from the active crater. ... [more]