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Originally posted by Aromaz
There are a number of volcanos active everyday of the year, all over the world.
Though interesting it is not so very strange and does not really affect anybody.
BUT - and this is a very big BUT:
When a volcano erupts, or new eruption it blows ash into the sky and often like this Russian volcanos - Sulphur Dioxide;
That is of importance to every person on earth - it will affect every living creature. Maybe only a little, maybe very big effect. When that ash cloud goes beyond 8,000 meters it imediatley gets picked up by the jet streams - then it can go intercontinental. We face serious climate changes and as you can see now on news - natural weather related disasters.
That all said: Some nice recent eruption photos here will also be very interesitng, welcome and appreciated. Let us see what we can learn from these fire spewing holes in the Earth.edit on 17/6/2011 by Aromaz because: (no reason given)
Originally posted by radpetey
How does the volcanic activity of the last 12 months compare with the annual averages of the last 50 years.
Please forgive me if this info has already been posted.
Originally posted by UtahRosebud
Would you please be so kind as to explain to the "lay person", such as myself... what it means with the sulphur dioxide and it's affect on us? I'm still learning about volcanos and would really like to understand this more. What does this mean for all of us on earth?
This event has been reviewed by a seismologist.
Date-Time Saturday, June 18, 2011 at 11:57:59 UTC
Saturday, June 18, 2011 at 06:57:59 PM at epicenter
Time of Earthquake in other Time Zones
Location 1.843°N, 99.108°E
Depth 12.8 km (8.0 miles)
Region NORTHERN SUMATRA, INDONESIA
Distances 38 km (23 miles) ENE of Sibolga, Sumatra, Indonesia
54 km (33 miles) NNW of Padangsidempuan, Sumatra, Indonesia
123 km (76 miles) S of Pematangsiantar, Sumatra, Indonesia
1233 km (766 miles) NW of JAKARTA, Java, Indonesia
Location Uncertainty horizontal +/- 15.2 km (9.4 miles); depth +/- 6.6 km (4.1 miles)
Parameters NST= 51, Nph= 52, Dmin=95.7 km, Rmss=0.99 sec, Gp= 83°,
M-type=body wave magnitude (Mb), Version=5
Source USGS NEIC (WDCS-D)
Event ID usc0004ase
At 21:00 appears a volcanic tremor which is the typical signature of an eruption (see fig. 4). The 6 hours crisis is interpreted as the fracturation by the intrusion (dyke) migration from down (magma chamber ??) toward surface.
Tremor is a continuous vibration of the ground around volcanoes. The signal lasts for a period from minutes to days.
The dominant frequency is 1-5 Hz. Harmonic tremor is a low frequency sine wave with smoothly varying amplitude. Spasmodic tremor is a high frequency, pulsating, irregular signal.
Volcanic tremor is a sustained seismic signal which is observed during either quiescent or active stages. The seismic signal results from the interaction between
hydrothermal-magmatic fluids and the surrounding rocks.
a low frequency sine wave with smoothly varying amplitude