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Originally posted by minkey53
Email me when something big is going to happen like Mt St Helens...!!
Originally posted by berkeleygal
Wow, and did you see what that seismograph was doing?
Indonesia has several volcanos smoldering at any given time, but another government volcanologist, Gede Swantika, said that normally only five to 10 would be at the third-highest alert level — which indicates an increase in seismic activity and visible changes in the crater. It is rare for any to be at second-highest — which signifies an eruption is possible within two weeks.
Geophysicist Pall Einarsson of the University of Iceland said that such an increase could be an indication that some of the volcanos — if any are very close — could be affecting one another. He said this idea is a new one for volcanologists, but they are increasingly seeing evidence of interplay between neighboring mountains.
Geologist Brent McInnes said as he hadn't seen the raw data but would find such a rash of volcanic activity significant.
"If it's true that there are over 20 volcanos demonstrating increased levels of seismic activity, then that is something we should pay attention to," said McInnes, a professor at Australia's Curtin University who has done extensive volcanic research in Indonesia.
He said such an increase could indicate "a major plate restructuring" — a major shift in the plates' position, rather than simply the usual jostling. "That would be significant."
........
There is considerable evidence for continuing, late-stage interaction between the magmatic system at Merapi volcano, Indonesia, and local crustal carbonate (limestone). Calc-silicate xenoliths within Merapi basaltic-andesite eruptive rocks display textures indicative of intense interaction between magma and crustal carbonate, and Merapi feldspar phenocrysts frequently contain crustally contaminated cores and zones.
petrology.oxfordjournals.org...
The major processes of magma–carbonate interaction identified are: (1) rapid decomposition and degassing of carbonate; (2) generation of a Ca-enriched, highly radiogenic strontium contaminant melt, distinct from the starting material composition; (3) intense CO2 vesiculation, particularly within the contaminated zones; (4) physical mingling between the contaminated and unaffected melt domains; (5) chemical mixing between melts.