Volcano activity of November 15, 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 15, 2012 volcano activity

The swarm of small (M<2) earthquakes continues beneath the South Moat of Long Valley Caldera (CA). (station MMX1)  The swarm is accompanied by a few weak, deep low-frequency events beneath Mammoth Mountain volcano as well.

Activity continues at a relatively high level at Popocatepetl volcano (Mexico). Numerous emissions of steam and ash (over 140) occurred during the past 24 hours and the Popo seismogram also shows a relatively high level of seismicity associated with the surface activity (and that pesky repeating pattern in the data).
Nothing new to report at the Guatemalan volcanoes Pacaya (station PCG), Fuego (station FG3), and Santa Maria (station STG6) today, but their seismic records were finally interference-free so I included them in today's report.  You can still pick out aftershocks from last week's big quake on the records.
A few volcanic earthquakes occurred overnight at Telica volcano (Nicaragua).  (station TELN)
A pulse of volcanic tremor and a few small earthquakes are visible on seismograms at Galeras volcano (Colombia) today. (station ANGV)
Small earthquakes remain frequent at Tongariro and Ruapehu volcanoes (New Zealand) and continuous volcanic tremor chatters beneath White Island volcano.
Recent satellite imagery shows a prominent SO2-rich plume issuing form Popocatepetl volcano, and lesser plumes over Ambrym volcano (Vanuatu) and New Britain Island (drifting from Manam? Rabaul?, Langila?).


  1. MattTheTubaGuy says

    Geonet (NZ) has increased the aviation alert from green to yellow for Ruapehu because of increased pressure below the lake increasing the probability of an eruption.