It’s kinda hard to get any information out of Indonesia directly, and I have to dig for what their volcanoes are doing because those guys don’t let us see their seismographs, except for 4 on Merapi. I’ve been digging hard for information on what Tambora is doing because it’s recently become much more active than it has been. I just found an excellent zoomed in satellite picture of the crater taken very recently, and it’s very revealing.
Here we clearly see active gas fumaroles around the upper inside slopes of the crater spewing thousands of tons of sulfur dioxide, carbon dioxide, hydrogen sulfide, and water vapor. Those gases come from magma. We could not ask for any clearer indication of rising magma under a volcano at this stage, and the appearance of a lava dome in the floor of the crater is very likely to come next.
I had originally thought that the water in the crater floor was boiling off, because of the reports of dense vapor appearing over the edge of the crater as seen from the village at the base of the volcano, but as we see here that dense vapor is gas and steam emanating from active fumaroles.
The Jakarta Globe gives us this report:
Dompu, West Nusa Tenggara. Residents who have spent most of their lives living on the slopes of Indonesia’s infamous Mount Tambora volcano are unfazed by the rumblings they are increasingly feeling from underneath the earth and warnings from the authorities.
The status of Tambora, responsible for by far the deadliest eruption in human history, was raised at 11 a.m. on Tuesday to the second-highest alert status.
Stay tuned volcanogeeks!