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Galunggung volcano news

Galunggung volcano (West Java, Indonesia): alert status raised due to changes in crater lake

ma, 13 feb 2012, 16:01
16:01 PM | DOOR: T
De alert status van Galunggung vulkaan in West-Java, Indonesië, groeide op vandaag (ma 13 februari 2012) als gevolg van een stijging van de temperatuur van het water en een verandering in kleur.

Verkleuring van het kratermeer was begonnen om opgemerkt te worden in september 2011, maar de veranderingen hebben de laatste tijd toegenomen. Volgens de plaatselijke vulkanologen het toezicht op de vulkaan, de hele meer is nu van het modderige kaki kleur. Naast de kleurverandering die kan worden veroorzaakt door een toename van meer fumarole activiteit werd een sterke plotselinge toename van 13 C meer water gemeten temperatuur, gebaseerd op metingen aan en voor 5 februari toen het bij normale 27 C, en op 8 mei, toen het 40 ° C warm.
Most fish in the lake have died and occasionally dead birds are found at the shore.
No other signs of a possible volcanic awakening were detected at the moment. The ph level of the water is still at normal levels 7-8, and there is no sulfur smell. Also, no significant seismic activity has been detected.
Nevertheless, PVMBG has now placed the volcano at alert level 2 ("watch", on a scale of 1-4) and recommends to stay away at least 500 m from the lake shore.

The last eruptions of Galunggnug was a small phreatic explosion in 1984, and the major destructive eruption in 1982-83, which produced violent explosions with ash columns reaching 20 km height, pyroclastic flows and large lahars. The eruption destroyed an older lava lake, killed many people and displaced up to 35,000.
The eruption is infamous for the aircraft accident on 24 June 1982: a British Airways Boeing 747 with 262 people on board flew through the ash plume and had to make an emergency descent after the ash caused all 4 engines to fail; fortunately, the plane could land safely.

The present-day crater lake (Danau kawah Galunggung) has a diameter of 1000 m and is 11 m deep and contains a volume of about 8 million m3 of water.
In the middle of the lake, a small 250 x 165 m diameter scoria cone which was produced during the final staged of the 1982-83 eruption rises to 30 m elevation.
A main hazard of the volcano are phreatic and phreatomagmatic eruptions capable of draining the lake and producing mud flows.
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Koppelingen / Bronnen:
  • Peningkatan status G. Galunggung dari Normal ke Waspada (Indonesian Geological Survey)
Galunggung vulkaan
Stratovulkaan 2168 m / 7,113 ft
West-Java, Republiek Indonesië, -7.25°S / 108.06°E
Current status: normal or dormant (1 out of 5)
Galunggung webcams / Live-gegevens | Reports
Books
Galunggung vulkaanuitbarstingen:
1984, 1982-83 (VEI 4), 1918, 1894, 1822
Typical eruption style:
Explosieve
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