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Originally posted by magickalworld
I believe they said the new dome was forming on the southside of the old dome, uplifting the glacier that is on the old dome
SEATTLE - Molten rock that has been rising inside Mount St. Helens after weeks of earthquakes and steam eruptions has finally pushed its way to the surface, forming a new lava dome just behind the existing one in the volcano's crater.
Dang Val. You had me thinking for a second that magma had broken through and was flowing down the mountain. Agh. Now I need a soda.
Unlike the dramatic rivers of red-hot lava from Hawaii's volcano, St. Helens' extrusion of new rock was subtle and difficult to see from outside the crater. A lazy plume of steam rose slowly from the mountain for much of Tuesday.
Mount St. Helens Volcano Activity
Mount St. Helens Special Conditions - October 12, 2004 - 1200 Hours (Noon) PDT
Seismic activity remained at low levels. Small earthquakes about magnitude 1.0 have continued at a rate of about 1 every 5 to 10 minutes. In the last few days, seismologists have seen a transition from earthquakes that reflect rock breaking events to those that are more consistent with the flow of hot water, steam or gas. GPS measurements continue to show no significant deformation of the north side of the 1980-86 lava dome or the outer flanks of the volcano.
Yesterday visual observations and thermal imaging of the crater, the 1980-86 lava dome, and the intensely deformed and uplifted area on the south side of the 1980-86 dome were conducted. Thermal imaging of the western part of uplifted area revealed temperatures of 900-1100 degrees Fahrenheit on a large pinkish-gray fin of rock (approximately 60-90 feet high and 150-180 feet long) and in nearby fumaroles and cracks.
These observations are consistent with new lava having reached the surface. Based on the appearance of the new material at the surface, the USGS is now comfortable with calling this uplifted and deformed feature a new lava dome. The large fin of rock is considered a part of the dome that has breached the surface. The appearance of new lava at the surface is not a surprise based on the evolution of deformation, the gradual increase in heating of the deformed area and gas data collected over the past few weeks. Additional visual and thermal observations will be made today to further evaluate this interpretation.
Yesterday afternoon around 4:00 p.m. a small steam and ash emission was observed by USGS field crews. The emission lasted just a few minutes and originated from the northwest sector of the new dome. Intermittent jets of dark ash rose about 60 feet above the ground and a steam rich plume with minor amounts of ash rose a few hundred feet above the crater rim. The USGS is collecting ash samples to evaluate and determine the nature of these small explosions. A visible steam plume will continue to be a normal occurrence.
Gas observations yesterday measured emissions of sulfur dioxide and carbon dioxide that are similar to or slightly lower than those measured on October 7th. Those measurements recorded emission rates of about 2000 tons per day of carbon dioxide and 100 tons per day of sulfur dioxide. For comparison, during the early 1980’s dome building events carbon dioxide emissions were commonly about 10,000-20,000 tons per day. Sulfur dioxide emissions are now slightly higher than hydrogen sulfide which indicating the system continues to dry out as would be expected with continued heat input. Carbon dioxide and sulfur dioxide emissions are a key parameter to assessing the state of the magmatic system (depth, gas content, volume and explosivity).
The intense unrest the past two and one-half weeks combined with yesterday’s observations, the USGS is now interpreting the current activity as a dome-building event. Dome growth is a dynamic process and as was observed in the mid 1980’s, Mount St. Helens and similar volcanoes elsewhere typically go through episodic changes in level of unrest over periods of days to weeks, or even months. Such changes are in part driven by variations in the rate of magma movement. USGS expects fluctuations in the level of unrest to continue during the coming days.
Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), combined with eruption models, show winds today will remain northwesterly. Any ash clouds will drift southeastwardly.
Anyway here is the Live feed : Update Aprx, every 5 min.
Originally posted by lostinspace
What causes the green color?
Originally posted by Valhall
Woa!....There's been a significant event at Mt. Rainier unconnected with MSH!