Volcano Discovery Wednesday May 01, 2013 19:02 PM
Lava overflow on the Sciara del Fuoco (INGV thermal webcam)
Seismic signal from RETU station (IG)
Stromboli (Eolian Islands, Italy): After decreasing a bit yesterday, the overflow of lava from the NE vents has gained in strength this morning again, accompanied by constant rockfalls, relatively strong explosions and higher tremor.
Tolbachik (Kamchatka): KVER reports no change in the ongoing eruption of the volcano and ongoing high tremor values at levels similar to the past weeks. Recent field reports however suggest that the eruption continues its slowly declining trend and might actually be ending soon.
A group who visited the volcano on 29 April could not see lava flows or explosions at the active cone on the southern fissure. It was even possible to walk on the now cooling lava flows. However, weak incandescence and a MODIS hot spot remain visible. It is likely that the still elevated tremor signal indicates that the magma continues to be fed into lava tubes and emerges in places that are difficult to see or access. Although it would not come at all as a surprise if the eruption ends, after almost half a year, it is certainly still too early to announce its end right now.
Telica (Nicaragua): Seismic activity has declined and is now again near normal levels (which include frequent earthquakes typical for Telica volcano's behavior).
Poas (Costa Rica): A small earthquake swarm occurred yesterday, probably caused by fluid movements bringing heat into the crater lake. Seismicity has calmed down today again.
Nevado del Ruiz (Colombia): A shallow (5 km depth) earthquake of magnitude 3.8 occurred yesterday at 10:24 local time north of the Arenas crater and has been followed by an ongoing earthquake swarm.
The quake was felt in nearby areas including Manizales and Villamaria. Possibly, this could mean a new magmatic intrusion, but so far no reports of increased surface activity have become known.
Reventador (Ecuador): Activity remains moderate with frequent small explosions detected on seismic signals and strong degassing producing a plume that was observed yesterday rising 800 m.
Tungurahua (Ecuador): Ash emissions and explosions of moderate size have continued and generated a plume averaging 1-2 km in height above the crater. During the night, incandescence is visible at the summit. Some of the stronger explosions are accompanied by cannon-shot noises.
Volcano Activity Summary for 1 May 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 29 Apr 2013)
Colima (Western Mexico): frequent explosions from growing lava dome, glowing rockfalls and small pyroclastic flows (updated 25 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 27 Apr 2013)
Fuego (Guatemala): weak to moderate strombolian activity (updated 30 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 25 Apr 2013)
Lokon-Empung (North Sulawesi, Indonesia): frequent small to moderate ash explosions (updated 14 Apr 2013)
Manam (Papua New Guinea): strombolian explosions, lava flow on southern flank (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 29 Apr 2013)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): ash emissions, small explosions (updated 14 Mar 2013)
Sakurajima (Kyushu, Japan): 0-3 weak to moderate vulcanian-style explosions per day, ash clouds up to 2-3 km altitude (updated 29 Apr 2013)
Sangay (Ecuador): no recent explosions reported (updated 27 Apr 2013)
Santa María / Santiaguito (Guatemala): advancing viscous active lava flows, weak occasional explosions (updated 30 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 1 May 2013)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Tolbachik (Kamchatka): effusion of fluid lava flows (updated 1 May 2013)
Tungurahua (Ecuador): ash emissions, explosions (updated 1 May 2013)
Yasur (Tanna Island, Vanuatu): strong strombolian activity (level 3), crater currently closed (updated 8 Apr 2013)
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