Volcano activity of November 19, 2012

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 19, 2012 volcano activity

Earthquake activity has fallen-off again at Little Sitkin volcano (Aleutians). (station LSSA)
Earthquakes beneath the South Moat of Long Valley caldera (CA) have now become infrequent and of very low magnitude. (station MMX1)  A few deep low-frequency earthquakes have occurred the past few days beneath nearby Mammoth Mountain volcano. (station MRD)
Surface activity remains subdued at Popocatepetl volcano (Mexico), about two gas and ash emissions per hour on average. The Popocatepetl seismogram shows volcanic tremor subsiding to background levels and a regional earthquake.
Tremor remains fairly continuous at Pacaya volcano (Guatemala) this morning.  Volcanic tremor ebbs and flows at nearby Fuego volcano (station FG3) and continues at relatively lower levels than we've observed at Santa Maria volcano during the past year.  (station STG6)
Increased tremor at Masaya volcano (Nicaragua) (station MASN) has given way to a few local earthquakes this morning.  Pulses of low-frequency earthquakes and/or tremor  are visible on seismograms at Concepcion volcano (station CONN), also in Nicaragua.
Numerous low-frequency (volcanic) earthquakes have merged into low level tremor at San Miguel volcano (El Salvador).  (station VSM)
What appear to be tiny local seismic events have appeared from time to time during the past week at Machin volcano (Colombia).  (station CIMA)  Equally small events and some volcanic tremor can be seen on this morning's seismogram at Galeras volcano (station ANGV), also located in Colombia.
Low level tremor continues within Ruapehu volcano (New Zealand) today, while small earthquakes still occur at nearby Tongariro volcano (a few larger regional events are also visible on seismograms recorded at both volcanoes).  Relatively strong, continuous volcanic tremor rattles-on within White Island volcano.
Recent satellite imagery has not detected significant gas plumes from any of the volcanoes we watch.

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