This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Rodger 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. -
February 19, 2013 volcano activity
An early activity post for a special reason.
Early this morning, Etna showed renewed activity. The video below shows this morning Bocca Nuevo paroxysm (short strong eruption).
Roger will normally post his daily activity overview on this page later today.
Thankfully, the volcanoes we watch behaved themselves (for the most part!) while I was away. The 17th of February seems to have been a “busy” day for a few volcanoes we watch, with larger-than-normal explosions at Colima (Mexico), ash emissions at Galeras (Colombia) (station ANGV), and an earthquake swarm at Nevado Del Ruiz (station OLLZ). Unrest at Poas and/or Turrialba volcanoes (Costa Rica) has simmered (if it truly was unrest at all!).
Sporadic earthquakes continue at Mount Hood volcano (OR) (station TDH).
A few earthquakes with magnitudes larger than M1.0 have occurred the past few days in the Long Valley Caldera region (CA). Interestingly, apparent trends of events have switched this past week from northeasterly to northwesterly (at least around Mammoth Mountain!).
Smaller (than those on 17 February) explosions continue at Colima volcano (Mexico) today. The rate of exhalations remains low at Popocatepetl volcano, averaging less than once per hour during the past 24 hours. The Popo seismogram shows low-level volcanic tremor.
Seismicity (resulting from rockfalls, small explosions, and pulses of volcanic tremor) is up slightly at Fuego volcano (Guatemala) (station FG3) today. Pacaya volcano (station PCG) continues to perk with small volcanic earthquakes and occasional tremor.
Numerous small volcanic earthquakes (and volcanic tremor in the past hour!) have afflicted Nevado Del Ruiz volcano (Colombia) (station OLLZ) overnight.
Seismicity at Reventador volcano (Ecuador) (station CONE) now consists mostly of steady, low-level volcanic tremor (if partially functional seismic equipment can be trusted!).
Earthquakes (red spikes) have become more frequent at White Island volcano (New Zealand) the past few days. Tremor has diminished (at certain frequencies) at the volcano during the same period.
Recent satellite imagery shows a possible eruption (or at least increased degassing!) at Mayon volcano (Philippines) today. SO2-enriched plumes also drift from Popocatepetl, Etna (in three prominent pulses) (Italy), and Ambrym (Vanuatu) volcanoes.