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According to a local news article referring to information from the volcano observatory, the volcano’s eruption started to eject visibly incandescent lava bombs this morning.
In more technical words, this suggests that by now the eruption entered a so-called magmatic phase where fresh lava arrives at the surface (as opposed to ash emissions from mostly pulverized older rocks, which might have been the activity so far). The head of the Center for Volcanology and Geological Disaster Mitigation, Edi Prasojo, said that” Bromo has entered an eruption phase”, the article mentions.
On a side note, incandescent ejected rocks alone, however, do not necessarily (although often) mean that they are from fresh magma. In some cases, they can also be older, very hot rocks from the conduit ejected by phreatic activity). An analysis of a sample or the ash would tell the difference.
Courtesy of volcanodiscovery.com
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