Roundup of Global Volcanic Activity – Ongoing Activity for the week of 3 May – 9 May 2017
Bagana | Bougainville (Papua New Guinea) : Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 7-9 May ash plumes from Bagana rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted over 110 km SE, SSE, and S.
Bezymianny | Central Kamchatka (Russia) : KVERT reported gas-and-steam activity at Bezymianny during 28 April-5 May, and a daily thermal anomaly identified in satellite images. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).
Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 3-6 May ash plumes from Dukono rose to altitudes of 2.1-2.4 km (7,000-8,000 ft) a.s.l. and drifted W, E, 90 km ESE, and 185 km NE.
Ebeko | Paramushir Island (Russia) : KVERT reported that during 28 April-5 May satellite images of Ebeko showed quiet conditions or weather cloud cover. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale). Based on satellite observations, the Tokyo VAAC reported that during 8-9 May plumes rose to altitudes of 2.4-2.7 km (8,000-9,000 ft) a.s.l. and drifted S and NE. The cause of the plumes was unclear, and weather clouds hindered observations.
Kambalny | Southern Kamchatka (Russia) : On 5 May KVERT reported that conditions at Kambalny were quiet the previous week. The Aviation colour Code was lowered to Yellow.
Kanlaon | Philippines : On 5 May PHIVOLCS reported that since the last phreatic eruption at Kanlaon, which occurred on 15 June 2016, there has been a general decline in activity: seismicity was at baseline levels, no significant deformation had been detected since August 2016, sulfur dioxide emissions were low, and no steaming had been observed since 29 September 2016. The Alert Level was lowered to 0 (on a scale of 0-5), though the public was warned to not enter the 4-km-radius Permanent Danger Zone (PDZ).
Kilauea | Hawaiian Islands (USA) : During 3-9 May HVO reported that the lava lake continued to rise, fall, and spatter in Kilauea’s Overlook crater. 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 adding to the growing delta. Surface lava flows were active above the pali.
Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that a weak thermal anomaly was identified in satellite images over Klyuchevskoy during 30 April-1 May, and an ash plume drifted about 52 km E on 1 May. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).
Nevados de Chillan | Chile : The Buenos Aires VAAC reported that on 3 May a webcam recorded a puff rising from Nevados de Chillán and dissipating rapidly.
Sabancaya | Peru : Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that during 1-7 May explosive activity at Sabancaya increased, with an average of 41 explosions detected per day. The number of long-period and hybrid events also increased. Ash plumes rose as high as 3.5 km above the crater rim and drifted more than 40 km NE and E. Based on webcam images, satellite views, and seismic data the Buenos Aires VAAC reported that during 3-9 May sporadic gas-and-ash puffs rose to altitudes of 7-8.2 km (23,000-27,000 ft) a.s.l. and drifted SE, E, and NE.
San Miguel | El Salvador : SNET reported that during 28 April-5 May RSAM values at San Miguel had decreased and fluctuated between 50 and 173 units (typical background levels average 50 units). Sulfur dioxide flux was also lower, though changing winds may have affected readings.
Santa Maria | Guatemala : INSIVUMEH reported that 10-12 explosions at Santa María’s Santiaguito lava-dome complex were detected by the seismic network during 4-5 May. Beginning at 2145 on 6 May a strong lahar, 30 m wide and 2.5 m deep, descended the Cabello de Ángel drainage, a tributary of the Nimá I river drainage on Santa María’s S flank, carrying branches, tree trunks, and blocks up to 2 m in diameter.
Sheveluch | Central Kamchatka (Russia) : KVERT reported that during 28 April-5 May lava-dome extrusion onto Sheveluch’s N flank was accompanied by strong fumarolic activity, dome incandescence, ash explosions, and hot avalanches. A thermal anomaly at the dome was identified daily in satellite images. Ash plumes drifted more than 730 km SE, SW, and NW during 27 April-3 May; explosions on 30 April generated ash plumes that rose to an altitude of 9.1 km (30,000 ft) a.s.l. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).
Sinabung | Indonesia : Based on PVMBG observations, webcam and satellite images, and wind data, the Darwin VAAC reported that during 3-9 May ash plumes from Sinabung rose to altitudes of 3-5.5 km (10,000-18,000 ft) a.s.l. and drifted in multiple directions.
Suwanosejima | Ryukyu Islands (Japan) : Based on JMA notices and satellite-image analyses, the Tokyo VAAC reported that on 8 May plumes from Suwanosejima rose to altitudes of 1-2.1 km (3,000-7,000 ft) a.s.l. and drifted N and SW.
Turrialba | Costa Rica : OVSICORI-UNA reported that an event at Turrialba at 1700 on 5 May generated a weak ash plume that rose 500 m above the crater and drifted SW. Two short-amplitude events occurred at 1702 and 1820 though there was no confirmation if they had corresponded to eruptions. During 5-7 May volcano-tectonic and long-period earthquakes were detected, as well as variable-amplitude tremor. At 1250 on 6 May an event produced a plume that rose 300 m and drifted W. Between 1250 and 1730 a passive ash emission rose no higher than 1 km. Another passive ash emission rose about 500 m at 1000 on 7 May and drifted WNW. At 0902 on 9 May an event generated an ash plume that rose 500 m and drifted NW.