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“The big difference is unlike prior to the collapse, the erupting magma is being exposed directly to seawater, so the eruptions are more explosive and actually creating its own ‘volcano thunderstorm’ from all the steam, ash and volcanic gases,” said Erik Klemetti, a volcano expert at Denison University in Granville, Ohio.
“It is inherently unstable as it’s just made of layers of lava and ash and debris.” On Friday, it was sending ash more than a mile skyward in eruptions as frequently as every minute, officials said. Anak Krakatau has been barely visible from shore for the past week, partly due to storms. But even when the sky clears, the plume of ash generated by the underwater reaction, known as a pyroclastic cloud, smothers the silhouette.
After dark, lightning strikes caused by energy released from the eruption can be seen every few seconds. Perhaps most likely, scientists say, the volcano will erupt slowly and grow foot by foot, piling fresh lava on top of old. Over time, the cone will again push higher above the surface. Officials said Saturday the volcano’s smaller size makes the chance of another large collapse unlikely.
What was once a volcanic cone standing some 340m high is now just 110m tall, says the PVMBG. In terms of volume, 150-170 million cubic metres of material has gone, leaving only 40-70 million cubic metres still in place. Quite how much mass was lost on 22 December itself and how much in the following days is unknown. Scientists may have a better idea once they have had a chance to visit the volcano and conduct more extensive surveys. But with the eruptions still ongoing and a safety exclusion zone in force - no-one is going near Anak Krakatau.
What was once a volcanic cone standing some 340m high is now just 110m tall, says the PVMBG.
In terms of volume, 150-170 million cubic metres of material has gone, leaving only 40-70 million cubic metres still in place.
originally posted by: Phage
a reply to: LookingAtMars
This image gives a better idea of what happened.