Volcanos

Roundup of Global Volcanic Activity – Ongoing Activity for the week of 5 July – 11 July 2017

Aira | Kyushu (Japan) : JMA reported a very small eruption at Showa Crater (at Aira Caldera’s Sakurajima volcano) on 3 July. The Alert Level remained at 3 (on a 5-level scale).

Bezymianny | Central Kamchatka (Russia) : KVERT reported that incandescence from Bezymianny’s lava dome was observed at night during 1-7 July, and a lava flow continued to flow down the W flank of the dome. A thermal anomaly was identified daily in satellite images. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Cleveland | Chuginadak Island (USA) : AVO reported that during 5-11 July no significant activity at Cleveland was observed in cloudy or mostly cloudy satellite and web camera images; some minor degassing was noted. Seismicity remained low. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.

Copahue | Central Chile-Argentina border : Based on webcam and satellite images the Buenos Aires VAAC reported that during 7-8 July steam plumes with minor amounts of ash rose from Copahue to altitudes of 4-4.3 km (13,000-14,000 ft) a.s.l. and drifted ESE.

Dukono | Halmahera (Indonesia) : Based on analyses of satellite imagery, wind model data, and notices from PVMBG, the Darwin VAAC reported that during 5-11 July ash plumes from Dukono rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted in multiple directions.

Ebeko | Paramushir Island (Russia) : Based on observations by residents of Severo-Kurilsk (Paramushir Island), about 7 km E of Ebeko, explosions on 1 and 4 July generated ash plumes that rose as high as 2.6 km (8,500 ft) a.s.l. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Karymsky | Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 1-3 July. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Kilauea | Hawaiian Islands (USA) : During 5-11 July 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 (which had many small spattering sites along the margin) 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. Several large cracks running parallel to the coastline spanned the width of the delta. Surface lava flows were active above and on the pali, and on the coastal plain.

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that during 1-2 and 5-6 July a weak thermal anomaly was identified in satellite images at Klyuchevskoy. Explosions during 1-2 and 5-6 July generated ash plumes that rose as high as 5 km (16,400 ft) a.s.l. and drifted 160 km SE, S, and SW. The Aviation Color Code remained at Orange (the second highest level on a four-color scale).

Nishinoshima | Japan : Based on satellite images and pilot observations the Tokyo VAAC reported that on 5 July an ash plume from Nishinoshima drifted E.

Poas | Costa Rica : OVSICORI-UNA reported that during 4-9 July plumes of magmatic gases, water vapor, and aerosols rose 200-600 m above Poás’s vents A (Boca Roja) and B (Boca Azufrada). Minor incandescence from the bottom of the crater was observed during 4-5 July, and a strong sulfur odor was reported in some areas of Alajuela and Heredia. During 5-7 July grayish-red ash emissions rose intermittently from vent A, and on 7 July a loud “jet” sound was noted in Mirador. A strong sulfur odor and minor ashfall was reported in some areas of Alajuela. An event at 1450 on 10 July generated a plume that rose 300 m.

Sabancaya | Peru : Observatorio Vulcanológico del Sur del IGP (OVS-IGP) and Observatorio Vulcanológico del INGEMMET (OVI) reported that explosive activity at Sabancaya increased compared to the previous week; there was an average of 10 explosions recorded per day during 3-9 July, and the explosions were more energetic. Gas-and-ash plumes rose 5.5 km above the crater rim and drifted more than 50 km NW and S. Sulfur dioxide flux was as high as 2,239 tons per day.

Santa Maria | Guatemala : INSIVUMEH reported that on 5 July a moderate lahar descended the Cabello de Ángel drainage, a tributary of the Nimá I river. Near the El Faro estate, the lahar was 30 m wide and 1 m deep, and carried blocks 50 cm in diameter. Weak explosions on 7 July generated white plumes that rose 700 m and drifted 2 km SE; minor ashfall was reported in the ranches of La Florida (5 km S) and Monte Claro (S). Weak avalanches of material traveled short distances down the E flank. Explosions during 10-11 July generated ash plumes that rose 600 m and drifted SW, causing some ashfall in La Florida.

Sinabung | Indonesia : Based on PVMBG observations, satellite images, and wind data, the Darwin VAAC reported that during 6 and 8-11 July ash plumes from Sinabung rose 3.3-5.5 km (11,000-18,000 ft) a.s.l. and drifted E, ESE, SE, and NW.

Turrialba | Costa Rica : OVSICORI-UNA reported that during 4-11 July plumes of water vapor, aerosols, and magmatic gases rose as high as 500 m above Turrialba’s crater rim, and on most nights incandescence emanated from Cráter Oeste. The emissions sporadically contained moderate amounts of ash during 5-7 July. Minor ashfall was reported in Coronado (San José), and in San Rafael and Barva (Heredia). Parque Nacional Volcán Turrialba staff reported that ash was deposited in the region between La Silvia and La Picada farms. Events at 1325 on 10 July and 1545 on 11 July generated plumes that rose 300 and 500 m above the crater rim, respectively.

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