Ecuador: Tungurahua volcano spews hot ash
The Tungurahua volcano in Ecuador has spewed a 10-kilometer column of hot ash and smoke, Agence France-Presse reported.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Apr 9, 2014
This one appears to be a bigger than average vulcanien explosion.
Tungurahua has been erupting for approx 5 years (maybe more) and is currently squeezing a long fracture filled with magma into the base of the volcano (hence the eruption), which may last decades.
Variability in eruption styles during this long timespan series is largely due to the variablity in the makeup of the fracture & also the tectonics close to the volcano (which is compressing @ the base of the crust where the fracture is). The vigorous eruptions tend to occur when the pressure in the fracture overcomes pressure in the base of the volcano & as a result gas rich magma injects into the base of the volcano & exchanges gas with the magma already in the volcano.
Arrival @ the surface & eruption is usually a few weeks after the injection event.
The eruption in this case appears more the result of a case of an injection of magma & bubble formation with relatively vigorous eruption a few weeks earlier. In this case it appears that the eruption wound down & a small crust formed over the vent. The "pop" in this article was a result of the slowly accumulating gas eventually blowing the crust off resulting in a spectacular but shortlived "fart".
The same activity type has occurred at Aira Caldera (Sakurajima) since the 1950s with a lull followed by a shortlived vulcanian explosion followed by re formation of a crust & more gas bubbles accumulating beneath it. There tends to be several a month in the case of Sakurajima. Switch over from the main crater to the Showa crater resulted in the formation of a quite shapely cone.
Vulcano in the 1880s had exactly the same activity resulting in characterisation of the "Vulcanian type.
For Tungurahua itself, the vulcanian & strombolian activity in the crater is occasionally interrupted by increased activity caused by arrival of a new injection of gas rich magma with eruption clouds similar to or larger then the usual activity with occasional pyro flows of St.Vincent or Mayon type caused by the collapse of a low dense eruption column or fire fountain.
No pyro flows in reportage from that last explosion which appears to have been gassy but low volume.
Have a nice day: Ag
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