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. -
January 27, 2013 volcano activity
KVERT reports no significant changes in eruptive behavior at Kamchatkan volcanoes Tolbachik, Sheveluch, Kizimen, and Bezymianny (lava extrusion), nor at Karymsky and Klyuchevskoi (small explosions) today.
An earthquake swarm which began early yesterday at or near Katmai volcano (Alaska Peninsula) (station KBM) ended overnight as abruptly as it began.
Small earthquakes continue beneath Mammoth Mountain volcano (CA) (station MMS) and immediately to the southeast in the Sierra Nevada Mountains.
Small explosions with rockfalls have continued during the past 24 hours at Colima volcano (Mexico), and exhalations of gas and ash returned to an average rate of once per hour at Popocatepetl volcano in the same period. The Popocatepetl seismogram shows low-level volcanic tremor and a few volcanic (explosion?) earthquakes.
I was unable to access seismograms for the Guatemalan volcanoes today, but the Santa Maria volcanocam shows continued small explosions and rockfalls occurring at the Santiaguito Dome Complex.
I could not access data for the Colombian volcanoes as well.
Small volcanic earthquakes have increased at Tungurahua volcano (Ecuador) (station RETU) since a few larger earthquakes occurred at the volcano two days ago. Low-frequency volcanic tremor has increased at the volcano since 22 January. Renewed eruptive activity at the volcano likely won't be far behind. Seismicity continues to run "hot" at Reventador volcano as well.
SERNAGEOMIN has not issued any new information about ongoing eruptive activity at Copahue volcano (Chile-Argentina border), but today's volcanocam photo shows a gas and ash plume drifting from the volcano.
Hybrid earthquakes have been occurring in pulses at White Island volcano (New Zealand), and recent volcanocam images appear to show propulsive ejection of vapor from the vent. The intensity of volcanic tremor at the volcano has been unsteady since the appearance of the earthquakes several days ago.
Recent satellite imagery shows an impressive SO2 plume eminating from Popocatpetl volcano. Smaller plumes are visible hovering over Turrialba volcano in Costa Rica, and Tavurvur volcano (New Guinea), as well as from one (?) of the active Sangihe arc volcanoes.