Volcano activity of November 12, 2012 - Popocatepetl, San Miguel, Nevado del Ruiz, Tongariro, White Island and Ubinas

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 12, 2012 volcano activity

Volcanic activity along the eastern rim of the Pacific is, save for Popocatepetl (Mexico), very low this morning.
At Popo volcano, small to moderate emissions of gas and ash reach near 100 per day.  Seismicity near the volcano has remained low, but a M2.3 volcano-tectonic event occurred at the volcano during the past day.

Popocatepetl volcano during the early morning hours

Seismograms from the Guatemalan volcanoes continue to be inaccessible (since the the big earthquake last week).
Volcano-seismicity at San Miguel volcano (El Salvador) has been punctuated with a few larger magnitude events the past two days (station VSM), but this is likely part of the volcano's "normal" mode of operation.
Small earthquakes made a brief return on seismograms at Nevado Del Ruiz volcano (Colombia) overnight, following a regional earthquake near the volcano.  (station OLLZ)
Small earthquakes are still visible on seismograms at Tongariro volcano (New Zealand), and remain fairly frequent on those recorded at nearby Ruapehu volcano.  It's business as usual offshore to north at White Island volcano where banded volcanic tremor fills seismic records.
Even recent satellite imagery suggests much reduced volcanic activity across the hemisphere.  One image of interest shows a possible small SO2 plume near Ubinas volcano (Peru).