- From: Oz <Oz@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 15 Jun 2006 07:39:52 +0100
MERAPI central Java, Indonesia 7.542°S, 110.442°E; summit elev. 2,947 m
On 8 June, according to a CVGHM report, the lava-dome growth rate at
Merapi was an estimated 100 thousand cubic meters per day and the
estimated volume was approximately 4 million cubic meters. An estimated
volume loss of 400 thousand cubic meters on 4 June was due to a partial
dome collapse of the S part of the Geger Buaya crater wall (constructed
from 1910 lava flows).
Gas plumes were observed almost daily during 7-13 June and reached a
maximum height of 1.2 km above the summit (13,600 ft a.s.l.) on 10 June.
During 8-10 June, the Darwin VAAC reported that small ash plumes were
visible on satellite imagery and minor ashfall was reported to the S at
the Merapi Volcano Observatory and in Yogyakarta, about 32 km (19.9
miles) away. On 8 June a pyroclastic flow, lasting 12 minutes, reached a
maximum distance of 5 km SE toward the Gendol River, the predominate
travel direction since the 27 May earthquake (M 6.2). According to a
news report, the 8 June event prompted approximately 15,500 people to
evacuate from the Sleman district to the S and the Magelang district to
the W. On 13 June, the Alert Level was lowered from 4 to 3 but renewed
pyroclastic-flow activity the next day again prompted a return to Alert
Level 4, the highest level.
Geologic Summary. Merapi, one of Indonesia's most active volcanoes, lies
in one of the world's most densely populated areas and dominates the
landscape immediately N of the major city of Yogyakarta. The steep-sided
modern Merapi edifice, its upper part unvegetated due to frequent
eruptive activity, was constructed to the SW of an arcuate scarp cutting
the eroded older Batulawang volcano. Pyroclastic flows and lahars
accompanying growth and collapse of the steep-sided active summit lava
dome have devastated cultivated and inhabited lands on the volcano's
western-to-southern flanks and caused many fatalities during historical
time. The volcano is the object of extensive monitoring efforts by the
Merapi Volcano Observatory of the Volcanological Survey of Indonesia.
Sources: Center of Volcanology and Geological Hazard Mitigation (CVGHM),
Darwin Volcanic Ash Advisory Center, Associated Press, Reuters, AFX News
This post is worth absolutely nothing and is probably fallacious.
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