Volcano activity of December 2, 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. -

December 2, 2012 volcano activity

Recent information about the ongoing eruption of Plosky Tolbachik was unavailable this morning, but recent satellite imagery may be finally detecting the low (atmospheric) level plume generated by the basaltic-andesite fissure eruption.
An earthquake swarm (ongoing since 27 November) continues to rattle the Coso Volcanic Field (CA) with events as large as M3.7 in the past few days.
Surface activity remains low at Popocatepetl volcano (Mexico) this morning.  The Popo seismograph shows weak volcanic tremor.
Magnitudes of volcanic earthquakes and background tremor appear on the ebb at Pacaya volcano (Guatemala) (station PCG), while volcanic tremor amplitude rose abruptly (but temporarily) overnight at nearby Santa Maria volcano (station STG6).  The "spikes" on the Santa Maria seismogram are due to an instrument malfunction, not volcanic activity.
Tremor has eased a little at Masaya volcano (Nicaragua) (station MASN) during the past 24 hours, while the tempo (but not magnitudes) of volcanic earthquakes has increased at Concepcion volcano (station CONN) during the same period.
Reventador volcano (Ecuador) (station CONE) continues its rhythmic, on-again-off-again co-eruptive seismic behavior.
Some small local earthquakes visible on the Tongariro (New Zealand) seismograms this morning.  Records from nearby Ruapehu volcano are complicated by alot of wind noise, while White Island volcano keeps on chugging with continuous volcanic tremor.
Recent satellite imagery shows continued activity at Ambrym volcano (Vanuatu).