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 2, 2013 volcano activity
KVERT reports no appreciable changes in ongoing eruptive activity at: Plosky Tolbachik (basaltic fissure eruption - high seismicity), Bezymianny (lava flow/dome extrusion - seismicity obscured by Tolbachik tremor), Kliuchevskaya Sopka (strombolian explosions at summit - seismicity obscured by Tolbachik tremor), Sheveluch (lava flow/dome extrusion with occasional collapse/explosive activity - low seismicity), Karymsky (occasional strombolian/vulcanian explosions - low seismicity). Gorely volcano continues to display moderate seismicity (mainly hydrothermal tremor), but no eruptive activity currently.
The earthquake swarm that began at Iliamna volcano (Alaska Range) (station INE) yesterday continues at a reduced pace. A seismic signal at around 4:30 am Alaska local time suggests a large avalanche occurred on the volcano. Iliamna is no stranger to avalanches of rock and ice, a large slide occurred in 1994 and another occurred as recently as October 2012. Earthquakes comprising the current swarm included events as large as M3.1, definitely sufficient to put material in motion on a steep, soggy volcano.
Small earthquakes continue beneath Mammoth Mountain volcano (CA) (station MMS). The larger events on the seismic record locate in the Sierra Nevada Mountains immediately southeast of Mammoth Mountain.
Volcanic tremor, small earthquakes, explosions, and rockfalls affected (and continue at) Colima volcano (Mexico) overnight. The number of exhalations at Popocatepetl volcano has risen to an average of twice per hour during the past 24 hours. The Popo seismogram shows low-level volcanic tremor, a few exhalation signals, and wave trains from two distant earthquakes.
Again, no updated seismic data from the Guatemalan volcanoes, but judging by this morning's volcanocam shot of Santiaguito Dome Complex (Santa Maria volcano), that volcano is alive and well! MODIS satellite thermal imagery shows "hotspots" at all three active volcanoes Santa Maria, Fuego, and now, Pacaya volcano.
Volcanic tremor has eased at San Cristobal volcano (Nicaragua) (station CRIN) overnight, but remains strong at nearby Masaya volcano (station MASN).
Local (and a few regional) earthquakes dot seismograms from San Miguel volcano (El Slavador) (station VSM) again today. San Miguel also exhibits continuous low-level volcanic tremor.
Episodes of low-level volcani tremor have re-appeared at Nevado Del Ruiz volcano (Colombia) (station OLLZ) overnight. Small volcanic and a few larger magnitude volcano-tectonic earthquakes also affect the volcano. Small, local earthquakes continue at nearby volcanoes Machin (station CIMA) and Galeras (station ANGV).
Seismograms from the Ecuadoran volcanoes were not accessible today.
SERNAGEOMIN reports continued low level seismicity (mainly in the form of volcanic tremor) at Copahue volcano (Chile-Argentina border) today.
Hybrid earthquakes (and volcanic tremor) have increased at White Island volcano (New Zealand). Increased gas emission from the volcano is now clearly visible. Seismicity remains relatively low at nearby restive volcanoes Ruapehu and Tongariro.
@JohnSeach reports :
- Paluweh volcano, Indonesia : High level eruption with ash to 45,000 ft altitude, 2 February UTC.
- Erebus volcano, Antarctica : now 2 lava lakes !
- Heard Island volcano, Australian territory. Satellite images show hotspots on 27 Jan and 1 February indicating eruptions.
Recent satellite imagery shows SO2-enriched plumes drifting from Nevado Del Ruiz, Ambrym (Vanuatu), and Nyiragongo (DRC) volcanoes today.