Re: Indonesia -1st a tsunami from a 7.7 earthquake, today a volcano
Posted by
CypressTX on 10/26/2010, 7:12 pm
http://www.volcanolive.com/merapi.html
it's a stratovolcano, it apparently erupts rather frequently, for a volcano:
Merapi volcano is one of the world's most active and dangerous volcanoes. It contains an active lava dome which regularly produces pyroclastic flows. Eruptions occur at intervals of 1-5 years and are of low gas pressure. Since magma is poor in gas, eruptions are usually less than VEI 3 in size.
Merapi is one of the most active volcanoes in Indonesia and has produced more pyroclastic flows than any other volcano in the world. It has been active for 10,000 years.
Most eruptions of Merapi involve a collapse of the lava dome creating pyroclastic flows which travel 6 to 7 km from the summit. Some awan panas have traveled as far as 13 km from the summit, such as the deposit generated during the 1969 eruption. Velocity of pyroclastic flows can reach up to 110 km/hour. A slow up flow of andesitic magma leads to an extrusion of viscous magma, which accumulate and construct a dome in the crater.
Violent Eruptions at Merapi volcano
There is evidence that the current low level of activity may be interrupted by larger explosive eruptions. Eruptions of Merapi volcano during the 7-19th centuries A.D. were more violent than the past hundred years, and produced explosion pyroclastic flows. Widespread pyroclastic flows and surges traveled up to 25 km down the flanks of Merapi.
Scientists predict that the quiet of the 20th century will be broken by a larger
explosive eruption within coming decades. (Scientific report published in 2000).
2010 Eruption
Merapi volcano was raised to level 3 alert (out of a maximum 4) due to inflation and volcanic earthquakes on 21st October 2010. Sand miners were asked to stop all activity, and people advised not to climb the volcano.
Merapi volcano erupted on 26th October 2010 killing 13 people. |
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