Volcanic activity worldwide 3 May 2015: Kliuchevskoi volcano, Colima, Karangetang, Dukono, Ruapehu

Currently erupting:

Ambrym (Vanuatu): active lava lakes in several craters (updated 14 Aug 2013)
Aso (Kyushu): intense strombolian activity from main vent in Nakadake crater (updated 25 Apr 2015)
Bagana (Bougainville Island, Papua New Guinea): ash emissions, lava dome growth (updated 2 Apr 2015)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 4 Nov 2014)
Calbuco (Southern Chile and Argentina): ash emissions (updated 30 Apr 2015)
Colima (Western Mexico): Irregular small to moderately large explosions (updated 3 May 2015)
Copahue (Chile/Argentina): ash venting (updated 4 Dec 2014)
Dukono (Halmahera): thermal anomaly, probably small explosive activity in summit crater (updated 3 May 2015)
Erebus (Antarctica): active lava lake in summit crater (updated 8 Dec 2014)
Erta Ale (Ethiopia): active lava lake in northern pit crater, active hornito with intermittend flow in southern crater (updated 11 Jan 2013)
Fuego (Guatemala): intermittent strombolian explosions (updated 20 Apr 2015)
Ibu (Halmahera, Indonesia): stromolian and phreatomagmatic explosions (updated 14 Nov 2014)
Karangetang (Siau Island, Sangihe Islands, Indonesia): lava flows, weak explosive activity at summit crater (updated 3 May 2015)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 27 Apr 2015)
Kilauea (Hawai'i): new lava flow from vents on NE flank of Pu'u 'O'o (updated 28 Apr 2015)
Kliuchevskoi (Kamchatka): degassing, probably mild strombolian activity in summit crater (updated 3 May 2015)
Manam (Papua New Guinea): ash emissions (updated 27 Apr 2015)
Mount Olympus (Mars)
Nishino-shima (Volcano Islands, Japan): growing island (updated 19 Jan 2015)
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)
Poas (Costa Rica): phreatic explosions (updated 14 Oct 2014)
Popocatépetl (Central Mexico): degassing, sporadic explosions, slowly growing lava dome (updated 13 Apr 2015)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): lava fountains, ash emissions from Tavurvur cone (updated 12 Sep 2014)
Raung (East Java): Large Strombolian explosions (updated 18 Mar 2015)
Reventador (Ecuador): intermittent weak to moderate explosions, occasional pyroclastic flows (updated 13 Apr 2015)
Sakurajima (Kyushu, Japan): ash venting, intermittent explosions (updated 27 Apr 2015)
Sangay (Ecuador): likely strombolian eruptions at summit crater (updated 13 Mar 2015)
Santiaguito (Guatemala): small explosions from the Caliente dome and active lava flow (updated 3 Feb 2015)
Semeru (East Java, Indonesia): growing lava dome, lava flow, strombolian activity (updated 26 Nov 2014)
Shiveluch (Kamchatka): growing lava dome (updated 3 Apr 2015)
Sinabung (Sumatra, Indonesia): continuing pyroclastic flows (updated 29 Apr 2015)
Soputan (North Sulawesi, Indonesia): active viscous lava flow, explosions, rockfalls, pyroclastic flows (updated 9 Mar 2015)
Stromboli (Eolian Islands, Italy): weak strombolian activity at summit vents (updated 16 Apr 2015)
Suwanose-jima (Ryukyu Islands): strombolian activity (updated 25 Apr 2015)
Tungurahua (Ecuador): volcanic unrest, ash emissions, degassing (updated 20 Apr 2015)
Turrialba (Costa Rica): ash emissions, weak strombolian activity (updated 24 Apr 2015)
Ubinas (Peru): continuous ash emissions (updated 9 Apr 2015)
Villarrica (Central Chile): pulsating gas and ash emissions (updated 24 Apr 2015)
Yasur (Tanna Island, Vanuatu): ash emissions, weak strombolian explosions (updated 14 Aug 2013)
Zhupanovsky (Kamchatka, Russia): intermittent ash emissions (updated 3 Apr 2015)

Eruption warning / minor activity:

Augustine (Cook Inlet (SW Alaska))
Barren Island (Indian Ocean): weak thermal hot spot (updated 27 Apr 2015)
Bezymianny (Central Kamchatka Depression): steaming, weak seismic activity (updated 3 Jul 2014)
Etna (Sicily, Italy): sporadic weak ash emissions from New SE crater (updated 19 Apr 2014)
Heard (Australia, Southern Indian Ocean): possibly lava lake in summit crater (updated 5 Dec 2014)
Kavachi (Solomon Islands): no eruption since 2007 (updated 16 Jun 2014)
Kerinci (Sumatra): seismic unrest (updated 5 Jun 2013)
Kirishima (Kyushu): degassing, alert lowered (updated 25 Oct 2014)
Krakatau (Sunda Strait, Indonesia): degassing (updated 31 Mar 2014)
Kuchinoerabu-jima (Ryukyu Islands): steaming, incandescence at main crater (updated 27 Mar 2015)
Lokon-Empung (North Sulawesi, Indonesia): small explosions, lava flow? (updated 13 Sep 2014)
Lopevi (Vanuatu): eruption warning (updated 16 Dec 2014)
Mayon (Luzon Island): steaming (updated 18 Dec 2014)
Nevado del Ruiz (Colombia): intermittent ash emissions, seismic unrest (updated 22 Apr 2015)
Nyamuragira (DRCongo): active lava lake (updated 29 Nov 2014)
Ontake-san (Honshu): steaming, low seismic activity (updated 18 Dec 2014)
Pacaya (Guatemala): ash emissions (updated 7 Feb 2015)
Papandayan (West Java): strong hydrothermal activity, increased seismicity (updated 6 May 2013)
Pavlof (Alaska Peninsula, USA): steaming, elevated seismic activity (updated 22 Dec 2014)
Piton de la Fournaise (La Réunion): unrest, eruption warning (updated 29 Apr 2015)
Rasshua (Central Kuriles)
Rincón de la Vieja (Costa Rica): phreatic explosions from crater lake (updated 21 Sep 2014)
Sacabaya (Northern Chile, Bolivia and Argentina)
San Cristobal (Nicaragua): possible ash emission on 11 April (updated 9 Mar 2015)
San Miguel (El Salvador): elevated seismic activity, pulsating gas emissions (updated 28 Jan 2015)
Shishaldin (United States, Aleutian Islands): mild explosive activity, intermittent more intense phases (updated 3 Apr 2015)
Slamet (Central Java): intense strombolian explosions (updated 12 Jan 2015)
Ulawun (New Britain, Papua New Guinea): degassing, ash venting (updated 5 Aug 2013)