Volcano activity of November 30, 2012

Last update: November 30, 2012 at 4:39 pm by By

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. -

November 30, 2012 volcano activity

KVERT reports that the Tolbachik eruption may have intensified with the opening of another fissure on the volcano’s north flank.  Satellite imagery still does not detect an SO2 cloud clearly (solely) related to the eruption. This is likely due to the eruption plume’s low altitude (<20,000 ft asl).
Exhalations at Popocatepetl volcano (Mexico) averaged about two per hour over the past 24 hours.  Continuous low-level volcanic tremor at the volcano appears to have given way to small discrete earthquakes.
Pacaya volcano (Guatemala) (station PCG) seems to be in a similar mode where continuous tremor has subsided and morphed-into numerous low-frequency earthquakes.  Seismicity at nearby Santa Maria volcano (station STG6) has also changed during the past 24 hours.  Continuous degassing produced tremor has changed to numerous “clone” earthquakes.  This type of activity has been frequently observed at dome-extruding volcanoes (Mount Saint Helens, Soufriere Hills, Mount Redoubt and others) and is an indication of lava extrusion.
Masaya volcano (Nicaragua) (station MASN) continues to experience somewhat elevated levels of volcanic tremor and low-level volcanic tremor is apparent on records at nearby Concepcion volcano (station CONN) this morning.
Seismograms for the Colombian volcanoes have still not updated.
Eruptive activity has strengthened dramatically (at least according to volcano-seismicity there!) at Reventador volcano (Ecuador) (station CONE).
Volcanic tremor has strengthened and small earthquakes have become more numerous overnight at Ruapehu volcano (New Zealand).  Tremor also appears to be up at nearby Tongariro volcano and offshore at White Island volcano.
Recent satellite imagery shows a relatively strong SO2 plume over Nevado Del Ruiz volcano (Colombia), another over Nyiragongo volcano (DRC), and yet another “mystery SO2 plume” from either Manam, Langila, Uluwan, or Tavurvur volcanoes (New Guinea).

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