Friday, November 30, 2012

GLOBAL VOLCANISM: The Volcano Activity Report For November 30, 2012!

November 30, 2012 - WORLDWIDE VOLCANOES - The following constitutes the new activity, unrest and ongoing report from geologist Richard Wilson who specializes in volcano seismicity and Armand Vervaeck.

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 (less than 20,000 feet above sea level).

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). - EarthQuake Report.

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