Global Volcanic Activity – New Activity for the week of 6 November – 12 November 2019

Cleveland | Chuginadak Island (USA) : Highly elevated surface temperatures identified in satellite data indicated that slow lava effusion in Cleveland’s summit crater may have begun during 7-8 November. AVO raised the Volcano Alert Level to Watch and the Aviation colour Code to Orange. Robust steaming was visible in satellite and webcam images on 7 November.

Klyuchevskoy | Central Kamchatka (Russia) : KVERT reported that a weak thermal anomaly over Klyuchevskoy was identified in satellite images on 6 November. The Aviation colour Code remained at Orange.

Manam | Papua New Guinea : RVO reported that at 1330 on 2 November a single large explosion at Manam generated a dense dark ash plume that rose 1 km above the summit and drifted NW. A shock wave was felt at the Bogia Government station (about 40 km SE) about 1 minute later. RSAM values on 6 November fluctuated between 250 and 360 units but began to increase around 1430 and triggered alerts around 1445. Values continued to increase and reached 400-500 units, heralding an eruption which began during 1600-1630. A gray ash plume rose 1 km and drifted NW. Incandescent material ejecting from the vent was visible at the start of the eruption and became more visible as the evening grew darker. The eruption peaked in intensity around 1930, then declined and ceased during 2100-2200.

Popocatepetl | Mexico : During an overflight of Popocatépetl on 5 November CENAPRED scientists, researchers from Instituto de Geofísica de UNAM, and members of the Coordinación Nacional de Protección Civil observed lava dome number 85 in the bottom of the inner summit crater. The dome was 210 m in diameter, 80 m thick, and had an irregular surface. The inner crater remained 350 m in diameter and was 90 m deep. CENAPRED reported that each day during 6-12 November there were 58-148 steam-and-gas emissions, some of which contained ash. Explosions at 0300 and 0501 on 6 November and at 0023 and 0655 on 7 November ejected incandescent tephra onto the upper flanks. Five more explosions were detected on 6 November. Eruptive events at 0858 and 0941 on 9 November generated ash plumes that rose 2 km above the crater rim and drifted NW; between those two ash emissions explosions were recorded at 0923 and 2055. Explosions on 10 November were recorded at 0648 and 1636. An explosion at 2203 on 11 November ejected incandescent tephra as far down the E flank as 1.5 km and generated an ash plume that rose 2 km and drifted NE. The Alert Level remained at Yellow, Phase Two (middle level on a three-colour scale).

Shishaldin | Fox Islands (USA) : AVO reported that the eruption at Shishaldin continued at variable levels during 5-12 November. Periods of high-amplitude tremor during 5-6 November were likely related to increased lava effusion and fountaining, though weather clouds prevented visual confirmation. Intermittent advancement of active lava flows and lahars on the N flank were confirmed in RADAR data, and by 7 November the lava flow was 1.3 km long and the debris flow runout was 5 km. Seismic tremor was low during 8-9 November suggesting lava effusion was less likely; weather cloud cover continued to obscure views, though elevated surface temperatures were sometimes detected during brief periods of clear weather. Activity significantly increased during 10-11 November with lava fountaining visible in webcam views throughout the evening and night. Strongly elevated surface temperatures at the summit and along the flanks were visible in satellite data. Ash emissions reported by pilots and visible on webcam images rose as high as 3.7 km (12,000 ft) a.s.l. and drifted N. Activity decreased during 11-12 November. Strongly elevated surface temperatures were consistent with cooling lava flows. Seismicity decreased during the evening of 11 November and remained low. Minor steam-and-ash emissions were visible in webcam images. The Aviation colour Code remained at Orange and the Volcano Alert Level remained at Watch.

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