View into Nyamulagira’s pit crater on 6 April 2016 (image: OVG / UN via Culture Volcan)

Source: Volcano Discovery

Nyamuragira (DRCongo): The lava lake at the bottom of the inner pit in the volcano’s summit caldera has recently disappeared, a recent survey by scientist from the Goma volcano observatory (OVG) and UN.
It is not known when exactly this happened and how, but the thermal signal stops abruptly around 1 April, suggesting that the lake, which had appeared during 2014, drained quickly at around this date. During their overflight on 6 April, the group of scientists from OVG, UN and the Second University of Naples around D. Tedesco only saw an incandescent vent, releasing a jet of hot gasses, in the place of the lava lake.

Currently erupting:

Alaid (Northern Kuriles): intense thermal signal from summit crater, strong degassing (updated 31 Mar 2016)
Ambrym (Vanuatu): active lava lakes in several craters (updated 18 Feb 2016)
Aso (central Kyushu, Japan): degassing, sporadic steam / ash explosions (updated 8 Mar 2016)
Batu Tara (Sunda Islands, Indonesia): strombolian explosions, ash plumes up to 500 m, extrusion of a small lava dome with rockfalls (updated 28 Nov 2015)
Chikurachki (Paramushir Island): new eruption since end of March 2016 (updated 31 Mar 2016)
Colima (Western Mexico): sporadic small explosions (updated 31 Mar 2016)
Copahue (Chile/Argentina): seismic unrest, occasional ash venting (updated 22 Mar 2016)
Dukono (Halmahera): mild strombolian activity, continuous intense ash emissions (updated 21 Mar 2016)
Erebus (Antarctica): active lava lake in summit crater (updated 8 Dec 2014)
Erta Ale (Danakil depression, Ethiopia): overflowing lava lake (updated 2 Mar 2016)
Fuego (Guatemala): lava flows on S and W flanks, lava fountaining from summit vent (updated 11 Apr 2016)
Ibu (Halmahera, Indonesia): stromolian and phreatomagmatic explosions (updated 29 Oct 2015)
Karymsky (Kamchatka): occasional small explosions, thermal anomaly (updated 1 Mar 2016)
Kilauea (Hawai’i): new lava flow from vents on NE flank of Pu’u ‘O’o (updated 28 Apr 2015)
Kliuchevskoi (Kamchatka): mild strombolian activity in summit crater (updated 7 Apr 2016)
Masaya (Nicaragua): active lava lake in summit crater since mid Dec 2015 (updated 3 Apr 2016)
Momotombo (Nicaragua): intermittent vulcanian explosions (updated 29 Mar 2016)
Nevado del Ruiz (Colombia): intermittent explosions, steaming, ash venting (updated 31 Mar 2016)
Nyiragongo (DRCongo): new vent on crater floor (updated 8 Mar 2016)
Ol Doinyo Lengai (Tanzania): effusion of natrocarbonatite lava inside the crater (updated 8 Jul 2013)
Pacaya (Guatemala): intense spattering from intra-crater cone (updated 29 Mar 2016)
Popocatépetl (Central Mexico): degassing, sporadic explosions, slowly growing lava dome (updated 4 Apr 2016)
Rabaul (Tavurvur) (New Britain, Papua New Guinea): lava fountains, ash emissions from Tavurvur cone (updated 12 Sep 2014)
Reventador (Ecuador): lava flow on SW flank (updated 24 Feb 2016)
Sakurajima (Kyushu, Japan): sporadic vulcanian explosions from Minamidake and Showa crater (updated 8 Apr 2016)
Sangay (Ecuador): small strombolian activity in summit crater (updated 4 Apr 2016)
Santiaguito (Guatemala): intermittent explosions from Caliente dome, strong degassing (updated 13 Apr 2016)
Semeru (East Java, Indonesia): growing lava dome, lava flow, strombolian activity (updated 14 Feb 2016)
Shiveluch (Kamchatka): growing lava dome (updated 31 Mar 2016)
Sinabung (Sumatra, Indonesia): continuing pyroclastic flows (updated 31 Mar 2016)
Stromboli (Eolian Islands, Italy): weak, intermittent strombolian explosions (updated 31 Mar 2016)
Suwanose-jima (Ryukyu Islands): strombolian explosions in Ontake crater (updated 11 Apr 2016)
Tungurahua (Ecuador): large and frequent explosions, ash columns rising several km (updated 9 Mar 2016)
Ubinas (Peru): sporadic vulcanian explosions (updated 16 Jan 2016)
Villarrica (Central Chile): lava lake in summit crater, spattering, strombolian explosions (updated 4 Apr 2016)
Yasur (Tanna Island, Vanuatu): ash emissions, weak strombolian explosions (updated 13 Nov 2015)
Zhupanovsky (Kamchatka, Russia): steaming / degassing (updated 31 Mar 2016)

More continued coverage and updates at Volcano Discovery: Volcanic activity worldwide 19 Apr 2016