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Andesite magma commonly erupts from stratovolcanoes as thick lava flows, some reaching several km in length. Andesite magma can also generate strong explosive eruptions to form pyroclastic flows and surges and enormous eruption columns. Andesites erupt at temperatures between 900 and 1100° C.
The word andesite is derived from the Andes Mountains, located along the western edge of South America, where andesite rock is common.
Andesite was the main rock type erupted during the great Krakatau eruption of 1883.
originally posted by: TrueAmerican
Just today a couple of odd events registered at Rainier on the USGS website:
They are listed as "Other" events. So let me show you those "Other" events...
According to the study, Mount Rainier sits atop a massive "chimney" of magma, a configuration unlike other neighboring volcanoes in Oregon.
originally posted by: collietta
True American, would tornillos be caused by glaciers settling after a new freeze? Last week there were some storms. This week it's been clear, or at least it's been clear near Portland. I no longer follow weather north of us as often as I used to.
originally posted by: rickymouse
Are you saying the people living around there may be screwed?
How is seismic data from one of those different than other seismic activity?