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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Jun 2, 2014
Early photos show a subplinian column with a column collapse pyro flow into the sea.
More handy info is the fact that it is the easternmost volcano of the java backarc basin. This backarc basin extends from the boundary transform in the Komodo strait W into S. Sumatra at least as far as Suoh & probably further N. into Sumatra. The backarc basin is responsible for major tsunami due to megathrust events of 2004 type which have caused occasional bloody great big tsunami on the N, & W. Australasia coasts.
The volcanoes erupt in response to recompression of the backarc basin which results in magma held in fractures @ the base of the crust being squeezed into the volcano. Good news is that the big calderas have already happened due to long wide fracture ingress. These being Lombok (early), and Tambora & Krakatau (late). Being the E. most volcano of the backarc basin & the orientation of the fractures it is erupting backarc magma. It an ancient trachyandesite caldera of tambora type, but it is now trachybasalt & minor amounts of trachyandeite; no caldera this time.
Good news is that this is merely a gas rich late stage fracture (cooled @ the base of the crust & exsolved gas). bad news is that being late stage it is only a short time before the next megathrust from the Java arc. Will likely happen when all the volcanoes finally go dormant (or @ least hot & fizzy).
Will keep watching that space.
Have a nice day: Ag
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