Volcanoes Today, 24 Apr 2015: Turrialba volcano, Villarrica, Calbuco
Friday Apr 24, 2015 18:00 PM |Turrialba (Costa Rica): The ejection of incandescent lava in small strombolian-type explosions has been observed since 03:40 this morning at the volcano's crater. This means that new magma has now arrived at the crater.
The gradual change of eruptive style over the past weeks, from hydrothermal (steam-driven) explosions with relatively cold ash, then increasingly hot ash and gas emissions to now at least partially magma-driven explosions, reflects the slow ascent of magma.
Villarrica (Central Chile): SERNAGEOMIN reported weak strombolian activity during the past days and the presence of a small oscillating lava lake in the summit crater's inner pit.
The explosions were limited to the crater area and ejected material to up to 100 m from the vent. A slight increase in activity was noted yesterday morning by local media. Bright glow is visible at the volcano's summit at night.
The Alert Level remained at Orange and (the second highest level on a four-color scale) and a 5 km access restriction zone is in place. A major risk could be lahars caused by sudden melting of snow if more intense activity sets in.
Calbuco (Southern Chile and Argentina): The volcano has so far stayed calm, but the alert level remains at red because another explosion could occur. A major problem in this situation seems to be that eruptions such as the recent one are likely to remain something impossible to predict - at least in some cases.
It seems that the eruption on Wednesday evening was only preceded by 15 minutes (!) of an intense intense earthquake swarm that could reasonably have been served as a clear warning sign.
Thursday, Apr 23, 2015
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Tuesday, Apr 14, 2015