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Currently erupting:

Ambrym (Vanuatu): active lava lakes in several craters (updated 14 Aug 2013)
Barren Island (Indian Ocean): intermittent activity, likely strombolian-type and/or lava flows (updated 4 Feb 2014)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 27 Mar 2014)
Colima (Western Mexico): extrusion of lava flow from summit, intermittent explosions (updated 20 Mar 2014)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 27 Mar 2014)
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): lava flow from base of New SE crater, strombolian explosions / ash emissions from NSEC (updated 4 Feb 2014)
Fuego (Guatemala): frequent moderate to large strombolian explosions (updated 29 Mar 2014)
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): likely lava lake in summit crater (updated 1 Aug 2013)
Ibu (Halmahera, Indonesia): growing lava dome, occasional ash emissions (updated 30 Mar 2014)
Karkar (Northeast of New Guinea): possible ash eruption on 1 February (updated 27 Mar 2014)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 31 Mar 2014)
Kavachi (Solomon Islands): no eruption since 2007 (updated 2 Feb 2014)
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 13 Aug 2013)
Kizimen (Kamchatka): degassing (updated 22 Aug 2013)
Lokon-Empung (North Sulawesi, Indonesia): small explosions, lava flow? (updated 25 Jul 2013)
Manam (Papua New Guinea): degassing, occasional ash venting (updated 28 Aug 2013)
Marapi (Western Sumatra, Indonesia): sporadic explosions (updated 27 Mar 2014)
Merapi (Central Java, Indonesia): sporadic phreatic explosions (updated 27 Mar 2014)
Nishino-shima (Volcano Islands): lava effusion enlarging the new island (updated 4 Mar 2014)
Nyiragongo (DRCongo): active lava lake in summit crater (updated 26 Feb 2014)
Ol Doinyo Lengai (Tanzania): effusion of natrocarbonatite lava inside the crater (updated 8 Jul 2013)
Pacaya (Guatemala): weak strombolian activity in summit crater (updated 10 Mar 2014)
Paluweh (off Flores Island, Indonesia): active growing lava dome (updated 12 Aug 2013)
Reventador (Ecuador): extrusion of lava flows from summit, small pyroclastic flows, ash venting and intermittent explosions (updated 31 Mar 2014)
Sakurajima (Kyushu, Japan): ash venting, intermittent explosions (updated 24 Mar 2014)
Santa María / Santiaguito (Guatemala): Santiaguito volcano (Guatemala): lava flow on south flank of dome becomes more active (updated 18 Mar 2014)
Semeru (East Java, Indonesia): growing lava dome, ash venting and small to moderate explosions (updated 25 Jul 2012)
Shiveluch (Kamchatka): growing lava dome, incandescent avalanches, occasional explosions (updated 26 Feb 2014)
Sinabung (Sumatra, Indonesia): effusion of viscous lava, steaming, ash emissions (updated 30 Mar 2014)
Slamet (Central Java): mild strombolian activity from summit crater (updated 26 Mar 2014)
Stromboli (Eolian Islands, Italy): continuing lava overflows (updated 25 Jul 2013)
Suwanose-jima (Ryukyu Islands): strombolian to weak vulcanian explosions (updated 24 Feb 2014)
Tinakula (Santa Cruz Islands, Solomon Islands): increased activity at the volcano (updated 8 Feb 2013)
Ubinas (Peru): slowly growing lava dome, degassing, ash venting (updated 31 Mar 2014)
Yasur (Tanna Island, Vanuatu): ash emissions, weak strombolian explosions (updated 14 Aug 2013)

Eruption warning / minor activity:

Aso (Kyushu): occasional weak ash emissions (updated 20 Feb 2014)
Bagana (Bougainville Island, Papua New Guinea): ash explosions (updated 26 Aug 2013)
Bezymianny (Central Kamchatka Depression): steaming, degassing (updated 10 Jun 2013)
Chirinkotan (Northern Kuriles): unspecified activity - possibly lava flows (updated 20 Feb 2014)
Chirpoi (Kurile Islands, Russia): hot spot visible on satellite imagery (updated 12 Mar 2014)
Cleveland (Aleutian Islands, Alaska): occasional small explosions (updated 2 Mar 2014)
Copahue (Chile/Argentina): seismic unrest (updated 21 Mar 2014)
Dieng (Central Java): increased degassing (updated 28 Mar 2013)
Galeras (Colombia): sporadic ash emissions (updated 25 Jul 2013)
Gamkonora (Halmahera): seismic swam, minor ash emissions (updated 27 May 2013)
Iliwerung (Lesser Sunda Islands): possible submarine eruption from Mt Hobal on 20 August (updated 20 Aug 2013)
Iwo-Tori-shima (Ryukyu Islands): possible small ash eruption on 6 July 2013 (updated 6 Jul 2013)
Kelud (East Java): steaming, activity at crater unknown (updated 2 Mar 2014)
Kerinci (Sumatra): seismic unrest (updated 5 Jun 2013)
Ketoi (Kurile Islands, Russia)
Kikai (Ryukyu Islands): steaming at summit crater of Iodake, occasional weak glows (updated 5 Jun 2013)
Kirishima (Kyushu): degassing, alert lowered (updated 30 Jul 2012)
Krakatau (Sunda Strait, Indonesia): degassing (updated 31 Mar 2014)
Langila (New Britain, Papua New Guinea): occasional ash explosions (updated 11 Feb 2013)
Medvezhia (Kurile Islands, Russia): strong steaming, thermal anomaly (updated 17 Jan 2013)
Nyamuragira (DRCongo): steaming/degassing from pit inside summit caldera (updated 18 Jul 2013)
Papandayan (West Java): strong hydrothermal activity, increased seismicity (updated 6 May 2013)
Poas (Costa Rica): occasional small phreatic explosions, intense degassing (updated 30 Mar 2014)
Popocatépetl (Central Mexico): degassing, sporadic explosions, slowly growing lava dome (updated 10 Mar 2014)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): weak ash explosions (updated 26 Aug 2013)
Rasshua (Central Kuriles)
Raung (East Java): strombolian activity in summit crater (updated 5 Aug 2013)
Rincón de la Vieja (Costa Rica): small phreatic eruption on 11 April (updated 6 Oct 2012)
Sacabaya (Northern Chile, Bolivia and Argentina)
San Cristobal (Nicaragua): seismic unrest, occasional phreatic explosions (updated 6 Feb 2014)
San Miguel (El Salvador): small explosions, seismic unrest, intense degassing (updated 10 Mar 2014)
Sangay (Ecuador): degassing (updated 24 May 2013)
Shishaldin (United States, Aleutian Islands): likely new dome building, weak explosions (updated 29 Mar 2014)
Tungurahua (Ecuador): sporadic explosions (updated 8 Mar 2014)
Turrialba (Costa Rica): ash venting, strong degassing (updated 24 Jul 2013)
Ulawun (New Britain, Papua New Guinea): degassing, ash venting (updated 5 Aug 2013)
White Island (New Zealand): strong degassing, volcanic tremor (updated 20 Aug 2013)