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. -
April 23, 2013 volcano activity
A magnitude M2.9, and more recently, a magnitude M2.8 earthquake was felt by local inhabitants near Nevado del Ruiz volcano (Colombia) (station OLLZ) this morning. Both earthquakes were centered northwest of Arenas crater at a depth of 7 km.
No daily report from KVERT (Kamchatkan volcanoes) today. A recent MODIS satellite image depicts heat signatures coming from the newly emplaced (since November 2012) Tolbachik lava field.
Another sequence of small earthquakes occurred this morning beneath the Central Pumice Cone at Newberry volcano (Cascade Range) (OR) (station CPCO). A magnitude M0.8 event was located there late yesterday (at around 5 km depth).
A northwest-trending line of earthquakes (including several magnitude M1.9 events) has taken shape through Mammoth Mountain volcano (CA) (station MRD) the past few days. Small earthquakes continue near the volcano today.
Numerous rockfall events and small pyroclastic flow signals dot Colima volcano (Mexico) seismograms again today. Exhalation activity has picked-up somewhat overnight at Popocatepetl volcano, as evidenced on seismograms there. Low-level volcanic tremor is also visible on the Popo seismogram.
Volcanocam photos of Fuego and Santa Maria volcanoes (Guatemala) paint a picture of tranquility at each this morning. On the other hand, seismograms from both cones (Fuego - station FG3; and Santa Maria- STG3) show vigorous internal unrest occurring there. Nearby Pacaya volcano (station PCG) seems to have established a routine of enhanced activity in the mornings and mainly internal activity thereafter during the past few days.
Volcanic tremor remains elevated at San Cristobal volcano (Nicaragua) (station CRIN) and numerous volcanic earthquakes (occasionally grading-into volcanic tremor) continue at Telica volcano (station TELN). Volcanic tremor is returning to a background level at Masaya volcano (station MASN).
Small earthquakes continue to be visible on seismograms at Poas volcano (Costa Rica) (station POA2).
Small volcano-tectonic earthquakes, and recently a pulse of emission tremor, affect Galeras volcano (Colombia) (station CUVZ) today.
Amplitudes of earthquakes at Cotopaxi volcano (Ecuador) (station CO1V) have continued to increase. Seismograms recorded overnight at Reventador volcano (station CONE) have appeared to be affected by electronic interference of some sort (bad solar panels/batteries?), but daytime recordings effectively show seismic activity continuing at the volcano.
White Island volcano (New Zealand) continues to rumble with continuous volcanic tremor of varying intensity.
No OMI satellite updates again today. Two volcanogenic "hot" areas were detected during recent MODIS satellite transits: at Tolbachik and Yasur (Vanuatu) volcanoes.