Roundup of Global Volcanic Activity – Ongoing Activity for the week of 15 March-21 March 2017

Bagana | Bougainville (Papua New Guinea) : Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 17 March an ash plume from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted W. The next day an ash plume rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted almost 85 km W.

Bogoslof | Fox Islands (USA) : AVO reported that no significant volcanic activity at Bogoslof was detected in seismic or infrasound data during 15-21 March, and satellite views were either obscured by clouds or showed nothing noteworthy. Slightly elevated surface temperatures were identified in satellite images during 16-17 and 20-21 March. The Aviation Colour Code remained at Orange and the Volcano Alert Level remained at Warning.

Colima | Mexico : Based on Centro Universitario de Estudios e Investigaciones de Vulcanologia – Universidad de Colima observations, the Unidad Estatal de Protección Civil de Colima reported that during 10-16 March there were three low-intensity explosions at Colima. A slight decrease of sulfur dioxide was detected. During an overflight scientists observed gas emissions from small explosion craters on the floor of the main crater; there was no evidence of a new lava dome. The report noted that the public should not enter the 6-km-radius exclusion zone.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 15-21 March ash plumes from Dukono rose to altitudes of 2.1-2.7 km (7,000-9,000 ft) a.s.l. and drifted in multiple directions. Ash plumes during 19-21 March drifted 150-280 km SW, W, and NW.

Ebeko | Paramushir Island (Russia) : KVERT reported that on 10 March several explosions at Ebeko, observed by residents of Severo-Kurilsk (Paramushir Island) about 7 km E, generated plumes that rose to an altitude of 1.6 km (5,200 ft) a.s.l. The Aviation Colour Code remained at Orange (the second highest level on a four-colour scale).

Fuego | Guatemala : INSIVUMEH reported that during 16-21 March explosions at Fuego generated sometimes dense ash plumes that rose as high as 950 m above the crater rim and drifted 10-12 km W, SW, and S. Ashfall was reported in Panimaché I and II (8 km SW), Morelia (9 km SW), Santa Sofía (12 km SW), and El Porvenir. Shock waves and rumbling from the explosions were sometimes heard. Incandescent material was ejected as high as 200 m above the crater rim. During 18-19 March incandescent material was ejected 200 m away from the crater. In a special report dated 21 March INSIVUMEH noted that lahars had begun descending the Santa Teresa and Las Lajas drainages at 1623 based on seismic data; it had been raining for a few days.

Kilauea | Hawaiian Islands (USA) : During 15-21 March HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook vent. Webcams recorded incandescence from long-active sources within Pu’u ‘O’o Crater, from a vent high on the NE flank of the cone, and from a small lava pond in a pit on the W side of the crater. The 61G lava flow, originating from a vent on Pu’u ‘O’o Crater’s E flank, continued to enter the ocean at Kamokuna; the lava stream was 1-2 m wide on 16 March, and plunged into the ocean from the end of the lava tube, about 20 m above the water. Surface lava flows were active above the pali.

Klyuchevskoy | Central Kamchatka (Russia) : On 16 March KVERT reported that although gas-and-steam emissions continued to rise from Klyuchevskoy’s crater, and a weak thermal anomaly was identified in satellite images, no explosions had been detected since 8 March. The Aviation Colour Code was lowered to Yellow (the second lowest level on a four-colour scale).

Nevado del Ruiz | Colombia : Based on satellite and webcam images, the Washington VAAC reported that on 17 and 20 March ash plumes from Nevado del Ruiz rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted NW and SW.

Pacaya | Guatemala : INSIVUMEH reported small Strombolian explosions at Pacaya’s Mackenney during 16-20 March. Lava traveled 30 m W, and sometimes crater incandescence was visible at night and at dawn.

Sabancaya | Peru : Based on webcam images, satellite views, and seismic data the Buenos Aires VAAC reported sporadic gas-and-ash puffs from Sabancaya during 14-15, 17-19, and 21 March, sometimes rising as high as 8.2 km (27,000 ft) a.s.l. Weather clouds often hindered observations of the volcano. Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that at 0802 on 21 March an ash plume rose 2 km and drifted more than 30 km SSE.

Sheveluch | Central Kamchatka (Russia) : KVERT reported that during 10-17 March lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. Satellite images showed a daily thermal anomaly over the dome, and ash plumes that drifted 100 km NW on 9 and 14 March. The Aviation Colour Code remained at Orange (the second highest level on a four-colour scale).

Sinabung | Indonesia : Based on PVMBG observations, satellite data, and wind data, the Darwin VAAC reported that during 15-18 and 21 March ash plumes from Sinabung rose to altitudes of 3-5.5 km (10,000-18,000 ft) a.s.l. and drifted E, N, W, and WSW.

Turrialba | Costa Rica : OVSICORI-UNA reported that during 20-21 March weak gas emissions at Turrialba contained sporadic, small amounts of ash, and rose no higher than 100 m above the crater rim and drifted SW. Volcanic tremor had medium and variable amplitude, and a few low-frequency earthquakes were recorded.

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