Volcano Discovery Monday Apr 22, 2013 18:23 PM
Current seismic recording from Nevado del Ruiz (OLL station, INGEOMINAS)
Stromboli (Eolian Islands, Italy): Magma stands high inside the conduits. A small overflow is occurring from the NE crater. The lava flow reaches about 100 meters length at the moment. Tremor and explosion signals are moderate to elevated.
Shiveluch (Kamchatka): A possible explosion or partial lava dome collapse produced a modest ash plume yesterday rising to 12,000 ft (3.7 km) altitude (VAAC Tokyo). KVERT reports no significant changes and continues to record moderate tremor levels, indicating that magma continues to rise and slowly build up the lava dome.
Tolbachik (Kamchatka): No changes were reported in the eruption. Lava flows continue to effuse from the southern fissure on Tolbachinsky Dol, and tremor levels remain stable (KVERT).
Batu Tara (Sunda Islands, Indonesia): Strombolian activity continues. A stronger explosion yesterday produced an ash plume rising to 7,000 ft (2.1 km) altitude detected on satellite (VAAC Darwin).
Soputan (North Sulawesi, Indonesia): Indonesian volcanologists raised the alert level to 3 out of 4 ("Siaga", alert) on 19 April. The decision was based on an increase in block avalanches and seismicity including numerous volcanic-tectonic VA earthquakes (rock fracturing) and long-period VB events corresponding to internal fluid movements.
Popocatépetl (Central Mexico): Activity has decreased to about one emission of gas/steam/minor amounts of ash per hour over the past few days. Glow remains visible at night from the crater.
Santa María / Santiaguito (Guatemala): Explosions of moderate size have been observed producing ash plumes reaching up to 900 m height, and causing light ash fall in the areas of Finca El Rosario and near San Marcos Palajunoj. Strong degassing noises were sometimes heard and some avalanches occurred from the flows on the NE and S sides of the active lava dome.
Pacaya (Guatemala): Weak strombolian activity continues from Mackenney crater, accompanied by visible incandescence at night.
Fuego (Guatemala): An increase in strombolian activity has been observed. Explosions eject incandescent material to 100-150 m height and creates avalanches when falling back onto the slopes.
Ash plumes from this activity have been rising 300-600 m.
Telica (Nicaragua): The seismic swarm continues with frequent, but smaller earthquakes compared to the previous week.
Nevado del Ruiz (Colombia): The earthquakes swarm at depths between 5-9 km continues with increasingly strong quakes, and accompanied by continuous volcanic tremor (since 10 April), indicating an ongoing magmatic intrusion. Some of the recent earthquakes were above magnitude 4 and felt in areas near Manizales town.
The volcano is now producing a plume of gas and ash rising to about 800 meters and light ash fall has occurred in various parts of Tolima.
Volcano Activity Summary for 22 Apr 2013:
Currently erupting:
Ambrym (Vanuatu): active lava lakes in several craters (updated 22 Mar 2013)
Bagana (Bougainville Island, Papua New Guinea): occasional ash explosions (updated 16 Apr 2013)
Bas Dong Nai (Vietnam)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 22 Apr 2013)
Colima (Western Mexico): frequent explosions from growing lava dome, glowing rockfalls and small pyroclastic flows (updated 20 Apr 2013)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 16 Apr 2013)
Erebus (Antarctica): active lava lake in summit crater (updated 21 Jan 2012)
Erta Ale (Ethiopia): active lava lake in northern pit crater, active hornito with intermittend flow in southern crater (updated 11 Jan 2013)
Etna (Sicily, Italy): ash emissions and strombolian activity at New SE crater (updated 20 Apr 2013)
Fuego (Guatemala): weak to moderate strombolian activity (updated 22 Apr 2013)
Gamalama (Halmahera): ash eruptions since 17 Sep (updated 17 Sep 2012)
Grozny (Iturup Island): fumarolic activity (updated 3 Apr 2013)
Heard (Australia, Southern Indian Ocean): possible lava lake in summit crater (updated 26 Mar 2013)
Karkar (Northeast of New Guinea): possible ash eruption on 1 February (updated 15 Mar 2013)
Kilauea (Hawai'i): lava lakes in Halemau'uma'u and Pu'u 'O'o, lava flows on coastal flat and weakly active ocean entries (updated 20 Apr 2013)
Kizimen (Kamchatka): growing lava dome, lava flow on eastern flank, avalanches (updated 4 Apr 2013)
Lokon-Empung (North Sulawesi, Indonesia): frequent small to moderate ash explosions (updated 14 Apr 2013)
Manam (Papua New Guinea): steaming, occasional ash venting (updated 16 Apr 2013)
Nyiragongo (DRCongo): active lava lake in summit crater (updated 20 Apr 2013)
Ol Doinyo Lengai (Tanzania): spattering and lava flows of natrocarbonatite lava inside the summit crater (updated 9 Dec 2012)
Paluweh (off Flores Island, Indonesia): active growing lava dome (updated 20 Apr 2013)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): ash emissions, small explosions (updated 14 Mar 2013)
Reventador (Ecuador): growing lava dome, lava flows on upper flank, frequent explosions (updated 14 Apr 2013)
Sakurajima (Kyushu, Japan): 0-3 weak to moderate vulcanian-style explosions per day, ash clouds up to 2-3 km altitude (updated 20 Apr 2013)
Santa María / Santiaguito (Guatemala): advancing viscous active lava flows, weak occasional explosions (updated 22 Apr 2013)
Semeru (East Java, Indonesia): growing lava dome, ash venting and small to moderate explosions (updated 25 Jul 2012)
Shiveluch (Kamchatka): slow dome growth, occasional explosions and pyroclastic flows (updated 22 Apr 2013)
Stromboli (Eolian Islands, Italy): Lava flow on Sciara del Fuoco in January 2013 (updated 22 Apr 2013)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Tolbachik (Kamchatka): effusion of fluid lava flows (updated 22 Apr 2013)
Yasur (Tanna Island, Vanuatu): strong strombolian activity (level 3), crater currently closed (updated 8 Apr 2013)
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