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Volcano activity of December 14, 2012 – Updates on Tungurahua and Machin volcanoes

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This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Richard Wilson who specializes in Volcano seismicity and Armand Vervaeck. Please feel free to tell us about new or changed activity if we haven’t written about it. -

Update on Tungurahua (Ecuador) and Machin (Colombia) volcanoes (23:16 UTC)

Just wanted to inform you that seismicity has increased dramatically at Tungurahua this afternoon. It is likely the volcano will undergo a pre-eruptive sequence of these crises, each more energetic than the previous. Given the open-vent state of the volcano, eruption is hours to days away

Also, a rather large (M3.2), deep (d=14 km) earthquake occurred in the southeast “nest” of seismicity beneath Machin volcano this afternoon. INGEOMINAS reports that it was felt by local inhabitants. Many small events have been eminating from this deep “nest” the past few days (we have reported on them!).


December 14, 2012 volcano activity

KVERT reports strong volcanic tremor at Plosky Tolbachik (Kamchatka Peninsula) again today. The eruptive plume height fluctuates (probably more due to atmospheric conditions than eruptive output) between 3 km and 4 km.

Image courtesy and copyright Kvert, Russia

Some earthquake activity continues beneath the Coso Volcanic Field (CA) with events ranging from M0.0 to M2.5 averaging one every one to two hours.

Three periods of earthquake activity struck Yellowstone Caldera overnight (station YFT).

Exhalations of gas and ash (in very minor amounts) occur at an average rate of more than two per hour at Popocatepetl volcano (Mexico).

Judging by the fact that “tremor” began yesterday and ended overnight nearly simultaneously at Guatemalan volcanoes Pacaya, Fuego, and Santa Maria volcanoes, it appears that wind noise rather than volcanic activity was the cause of the curious signal on seismograms recorded at those volcanoes yesterday (See yesterdays report). Today, the Pacaya seismogram (station PCG) is relatively quieter with numerous small volcanic earthquakes and a few pulses of true volcanic tremor. The same can be said of the seismogram recorded at nearby Fuego volcano (station FG3) where low level volcanic tremor predominates. A relatively “loud” tremor signal continues at Santa Maria volcano (station STG6). This may be in fact true volcanic tremor since the volcano is in a heightened state of activity with production of lava flows and strong degassing. The Santa Maria edifice is much larger (higher) and may also still be affected by wind from a nearby weather system lingering at higher altitude.

Periods of banded tremor (or is it wind too?) appeared overnight at San Cristobal volcano (Nicaragua) (station CRIN). A period of higher amplitude tremor has eased overnight at nearby Masaya volcano (station MASN).

Spasmodic tremor occurred late yesterday at Nevado Del Ruiz volcano (Colombia) (station OLLZ). Today small volcanic earthquakes and bursts of tremor affect the volcano. Numerous small earthquakes periodically rattled Machin volcano (station CIMA) during the same period.

Numerous small volcanic earthquakes continued overnight at Tungurahua volcano (Ecuador) (station RETU). The earthquakes likely reflect input of new (hotter) volcanic fluids beneath the cone. Stand-by! Another strong pulse of volcanic tremor and volcanic earthquakes shook Reventador volcano (station CONE) overnight. the volcano has since returned to relative quiet.

Trains of small “chugging” earthquakes continue at Tongariro volcano (New Zealand) and small local earthquakes have resumed (after taking a short break at the end of November) at Ruapehu volcano. Relatively strong, continuous volcanic tremor shudders within White Island volcano again today.

A weak SO2 plume hovering over Nevado Del Ruiz volcano is the only volcanic plume visible in recent satellite imagery of the Pacific rim.


Source:


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