Download Volcanic Activity of Mt. Ijen Increased, PVMBG Increased the

Volcanic Activity of Mt. Ijen Increased, PVMBG Increased the Status to Watch
Oleh Administrator
Senin, 19 Desember 2011 09:24
BANDUNG. The Center for Volcanology and Geological Hazard Mitigation
(PVMBG) Geological Agency, MEMR commecning from December 18th
2011 at 4 a.m. increased the status of Mt. Ijen from Advisory (Level II) to
Watch (Level III). Citizens surrounding Mt. Ijen and
visitors/tourism/hikers/miners are not alllowed to get close to the crater in the
peak of Mt. Ijen within the radius 1, 5 km from the active crater.
“ Based
on visual and seismic observation and also data analysis, so
th, 2011 at 4 a.m. the activity status of Mt. Ijen increased from
commencing
on
December
18
Advisory (Level II) to Watch (Level III),” says Surono.
Related to the increased status, PVMBG will increase observation intensively to evaluate the activity of
Mt. Ijen and coordinate with local BPBD. Mt. Ijen is an active volcano having Crater Lake in the peak
with 800 m length, 700 m width, and 180 m depth. Geographically, Mt. Ijen is located in the position of 8º
03’ 30” South Lat. and 114º 14’ 30” West Long., with its peak 2386 m above the sea level (asl).
Administratively is located in two districts; Bondowoso and Banyuwangi, East Java province. Mt. Ijen
eruption recorded in the history was phreatic explosion coming from the Crater Lake. The last phreatic
eruption happened in 1993 producing high black ash, which reached 1000 m height. Since December 15
th
, 2011 the activity of Mt. Ijen increased from Normal (Level I) to Advisory (Level II) based on its seismic
activity increase.
Since October – December 14 th , 2011 the volcanic activity increase of M. Ijen was
designated by the volcanic activity increase both visual, its number of monthly
deep volcanic earthquake (VA), shallow volcanic (VD) and continuous tremor
th – 14 th of December 2011
earthquake. Since 5
the volcanic activity increase was followed by harmonic tremor earthquake, which
designated the activity near the surface under the Crater Lake becoming more
intensive. Within the period of December 15
th
– 17
th
, 2011 there had been activity increase significantly, which was designated by
sharply number of deep volcanic earthquake and shallow volcanic earthquake and
also followed by the strengthening of SO2 gas surrounding Crater Lake of Mt. Ijen
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Volcanic Activity of Mt. Ijen Increased, PVMBG Increased the Status to Watch
Oleh Administrator
Senin, 19 Desember 2011 09:24
The period of December 15 th – 17 th 2011 there had been activity
increase significantly, which was designated by sharply number of
deep volcanic earthquake and shallow volcanic earthquake and
also followed by the strengthening of SO2 gas surrounding Crater
Lake of Mt. Ijen
The visual observation of the Crater Lake on December
17th, 2011 showed the color of the lake changed from
light green whitish to white. The smell of sulfur gas
surrounding the crater became stronger and the water
temperature measurement of the Crater Lake becoming
difficult to do without wearing mask.
The eruption danger potency of Mt. Ijen in
Disaster-Prone Area III is surrounding the Crater
Lake. It is threatened by poisonous gas flow,
pyroclastic flow, hot mud, lava, heavy ash rain,
and explosion lava. The Disaster-Prone Area II is
the potency of pyroclastic flow, explosion lava,
rain lava, heavy ash rain, and possibly volcanic
landslide and incandescent material flow. 2/3
Volcanic Activity of Mt. Ijen Increased, PVMBG Increased the Status to Watch
Oleh Administrator
Senin, 19 Desember 2011 09:24
The Disaster-Prone Area I is lava rain flow,
pyroclastic expansion or explosion lava, heavy
ash rain, and possibly affected by incandescent
material flow. The head of PVMBG asked citizens
surrounding Mt. Ijen to be calm and not
influenced by issue of Mt. Ijen explosion and not
to get close to the crater in the peak of Mt. Ijen
within the radius 1, 5 km from active crater. For
citizens live in surrounding Mt. Ijen within KRB II
to be always alert and pay attention to the
progress of Mt. Ijen activity issued by local
BPBD. “Citizens live along Banyuputih River, up
streaming in Crater Lake Ijen have to be alert to
the possibility of Crater Lake Ijen overflow if
explosion happens,” says Surono. (AK)
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