Chile’s Calbuco had a very busy day after its unexpected eruption on April 22. The initial eruption produced a ~15 kilometers plume that towered over the region and dumped upwards of 40 centimeters of ash and larger volcanic debris on some areas. The first explosion ended with lava flows* that made it down from the summit crater but it is likely that any dome that formed in the crater was destroyed by a second explosive eruption that may have reached over 15 kilometers in the early morning hours of April 23. Around 4,000 people have been evacuated from town near Calbuco.
* UPDATE April 24, 8:45 AM EDT: Well, as with many volcanic eruptions, the details changed as we learn more. Right now, it is unclear whether any lava flows were emitted during the eruption of April 22-23. The initial tweets from the SERNAGEOMIN mentioned lava flows. However, the initial ...
