Another violent eruption occurred at Santiaguito lava-dome complex of Santa Maria volcano in Guatemala on the morning of September 21, 2013. At about 02:30 UTC (08:30 local time), the Caliente dome suddenly produced a series of major pyroclastic flows triggered by collapse of accumulated viscous lava at the southeastern rim and flank of the dome.
The flows descended on all sides of the lava dome.
The explosions, accompanied by shock waves that could be heard in 20 km radius, produced an ash plume that rose to about 4.5 km altitude or about 2 km height above the crater. Significant (but smaller compared) ash plume rose from the pyroclastic flows. Ash fall occurred in Quetzaltenango, Santa María de Jesús, Zuníl and other areas downwind. (VD)
There has been no recognized precursor to the eruption, illustrating that the activity of the lava dome is highly unpredictable and potentially extremely dangerous.
Credit to the watchers
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