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Volcano activity of December 4, 2012 – eruption photo from Plosky Tolbachik (Kamchatka)

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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. -

December 4, 2012 volcano activity

First of all thanks to ER reader Klaus to send us the url of the Plosky Tolbachik webcam.

KVERT reports that seismicity associated with the ongoing flank fissure eruption at Plosky Tolbachik (Kamchatka Peninsula) remains high.  Recent satellite imagery shows the eruption plume being pulled south and east of the eruption site by low pressure to the north.

A burst of small earthquakes began yesterday beneath the South Moat of Long Valley Caldera (CA) (station MDR).  The number of events decreased overnight, but magnitudes are higher (M1Coso Volcanic Field.  Events there have migrated north, deepened (along a fault?) and decreased in magnitude with time (due to higher temperature at depth?). Nine earthquakes between M1 and M3 have occurred beneath the field thus far today.
Surface activity remains subdued at Popocatepetl (gas and ash exhalations average one every two hours), but the volcano put on a brief display of some of its power yesterday afternoon when it launched an ash cloud nearly three kilometers high.  The Popocatepetl seismogram shows the event (many times due to a software defect!).
Seismograms from the Guatemalan volcanoes were not accessible today.
A brief pulse of volcanic earthquakes occurred overnight at (or near) Cerro Negro volcano (Nicaragua) (station CNGN).  Volcanic tremor seems to be slowly easing at nearby Masaya volcano (station MASN), and periods of low-amplitude volcanic tremor have appeared on seismograms at Concepcion volcano (station CONN) during the past 24 hours.
Strong volcanic seismicity, in the form of both tremor and low-frequency (explosion?) earthquakes continues at Reventador volcano (Ecuador) (station CONE) today.
A few small local earthquakes are evident on seismograms from Tongariro volcano (New Zealand).  More numerous small earthquakes, admixed with low-level volcanic tremor occur at nearby Ruapehu volcano, and the White Island seismogram remains filled with continuous, relatively strong volcanic tremor again today.
Recent satellite imagery caught the plume from yesterday’s explosion at Popocatepetl, and a relatively small SO2-enriched plume drifting from Nyiragongo volcano (DRC).

Source:



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