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 24, 2013 volcano activity
KVERT reports no significant changes in eruptive/seismic behavior at the five active Kamchatkan volcanoes: Tolbachik (basaltic fissure – slowly waning volcanic tremor), Sheveluch and Kizimen (lava flow/dome extrusion – moderate seismicity), Bezymianny (lava flow/dome extrusion – weak seismicity), and Karymsky (occasional strombolian/vulcanian explosions – no seismic data due to equipment outtage). Gorely volcano continues to be affected by moderate seismicity associated with strong hydrothermal activity taking place within and around its summit crater lake.
Another pulse of seismicity occurred at Newberry volcano (Cascade Range) (OR) (station CPCO) overnight. The events are only well detected by the Central Pumice Cone seismometer, and not the west flank instruments, so I’m thinking they are “real” and not produced by geothermal exploration occurring in that area.
Small earthquakes continue in the vicinity of Mammoth Mountain volcano (CA) (station MRD).
Rockfalls and small pyroclastic flows (pictured in the included Colima volcanocam photo) continue at a high rate at Colima volcano (Mexico) today. A moderate-sized explosion overnight at Popocatepetl volcano launched incandescent blocks onto the volcano’s outer flanks. Volcano-tectonic events are frequent at the volcano today (see Popo seismogram), including a magnitude M1.8 (large event on record) earthquake.
Occasional strombolian explosions continue at Pacaya (Guatemala) (station PCG) and Fuego (station FG3) volcanoes today. Two moderate-sized vulcanian explosions were heard overnight coming from the Santiaguito Dome Complex (Santa Maria volcano) (station STG3).
Volcanic tremor has increased since yesterday at San Miguel volcano (El Salvador) (station VSM).
Amplitude of volcanic tremor has also increased notably at San Cristobal volcano (Nicaragua) (station CRIN) since yesterday. Frequent, small volcanic earthquakes (occasionally merging into volcanic tremor) continue at nearby Telica volcano (station TELN). Passage of teleseismic surface waves appear to have triggered a brief increase in tremor amplitude at Masaya volcano (station MASN) late yesterday. A more recent increase in tremor at Masaya appears to be of the volcano’s own accord.
Signals suggestive of hydrothermal activity appeared on seismograms at Poas volcano (Costa Rica) (station POA2) in the past 24 hours.
Earthquake activity continues at Nevado Del Ruiz volcano (Colombia) (station OLLZ), but the amplitude of continuous volcanic tremor at the volcanic appears to have decreased since yesterday. Tiny (volcanic?) earthquakes have affected Sotara volcano (station SOSO) for several days now. Tiny volcano-tectonic events are apparent on seismograms from Machin (station CIMA), Cumbal (station MEVZ), and Galeras (station CUVZ) (along with gas/ash emission signals) volcanoes as well.
What appear to be higher amplitude (than usual) volcanic earthquakes continue at Cotopaxi volcano (Ecuador) (station CO1V) today. Solar panel/battery “issues” have allowed viewing of only daytime activity at Reventador volcano (station CONE) the past week. Those records show variable levels of volcanic tremor, earthquakes and explosion signals occurring at the volcano.
Amplitude of volcanic tremor has remained variable at White Island volcano (New Zealand) during the past 24 hours.
Recent OMI satellite data show SO2 plumes drifting from Popocatepetl, Ambrym (Vanuatu), Soputan and Dukono (Sangihe arc) volcanoes. Recent MODIS satellite transits failed to detect volcanogenic “hotspots”.