Volcanos

Roundup of Global Volcanic Activity - New Activity for the week 12 October -18 October 2022

Alaid - Kuril Islands (Russia) : KVERT reported that the eruption at Alaid was ongoing during 7-14 October and a daily thermal anomaly was identified in satellite images. Explosive activity on 16 October generated ash plumes that rose to 3.7 km (12,100 ft) a.s.l. and drifted 293 km ESE.

Bulusan - Luzon (Philippines) : On 12 October PHIVOLCS raised the Alert Level for Bulusan to 1 (on a scale of 0-5) due to increased seismicity, inflation, and gas emissions. From 0500 on 11 October to 1500 on 12 October the seismic network detected 126 weak earthquakes located at depths of 0-5 km. Most of the events were concentrated beneath the NW flank and summit area and were indicative of rock-fracturing processes. Other data suggested increased hydrothermal activity and unrest including increased temperatures and carbon dioxide emissions at area hotsprings beginning earlier in the year, pronounced inflation of the SW and S flanks that began in September, and a sulfur odor reported by residents of Sitio Talistison in Barangay Mapaso (Irosin) and Barangay San Roque (Bulusan) during 10-11 October. Daily earthquakes totaled 164 during 13-14 October and 79 during 14-15 October; daily counts were 26-32 during 15-18 October. Sulfur dioxide emissions were 302-386 tonnes per day during 15-16 October. P

Chikurachki - Paramushir Island (Russia): KVERT reported that an explosive eruption at Chikurachki began at around 0310 on 16 October. A dense ash plume identified in satellite images rose to 4.5 km (14,800 ft) a.s.l. and drifted 240 km ESE. At 1011 and 1620 that same day ash plumes were visible in satellite images rising as high as 3.5 km (11,500 ft) a.s.l. and drifting ESE; by 1620 ash plumes from the eruption had extended as far as 523 km. KVERT noted that ash emissions were last seen at 0130 on 17 October and a thermal anomaly was visible at 0432.

Grimsvotn - Iceland : Icelandic Meteorological Office (IMO) reported that the small jökulhlaup at Grímsvötn that began on 10 October had peaked on 16 October and then began to subside. The onset of the jökulhlaup was slower than forecasted, flowing in the Gigjukvisl River at about 300 cubic meters per second by 12 October. The ice sheet had subsided a total of 7 m. A M 2 earthquake was recorded on 13 October just NE of Grímsvötn but did not signal increased seismicity. By 14 October the outflow from the lakes was an estimated 500 cubic meters per second and subsidence has totaled 15 m. Four earthquakes, all under M 2.5, were recorded during 15-16 October.

Kerinci - Central Sumatra : PVMBG reported that white-and-black plumes from Kerinci rose as high as 350 m above the summit and drifted NE during 15-16 October. Two VONAs were posted on 19 October; at 0620 on 19 October an ash plume rose 500 m above the summit and drifted NW, and at 0815 an ash plume rose 700 m and drifted NW.

Nishinoshima - Izu Islands : JMA reported that on 12 October ash plumes from Nishinoshima rose 2.2-3.5 km (7,200-11,500 ft) a.s.l. and drifted NW and W.

Stromboli - Aeolian Islands (Italy) : INGV reported that activity had decreased at Stromboli by 16 October following a week that included lava overflows at vent N2 (in Area N, North Crater), a partial collapse of the vent rim, and both pyroclastic and lava flows descending the Sciara del Fuoco. Lava flows continued to effuse from N2 during 10-15 October, though they gradually traveled to shorter distances through the week. Material from the eroded channel of the Sciara del Fuoco and collapses from the lava flows descended the channel, contacted the water and produced steam and ash plumes, and formed a delta of debris. By 15 October lava flows had rebuilt the N2 rim which prevented lava from flowing down the Sciara del Fuoco. Explosive activity at N2 was variable from low levels to intense spattering that culminated into lava fountaining during 10-13 October. The activity abruptly decreased on 14 October, though minor spattering continued. Occasional low-intensity ash emissions were visible during the morning of 16 October and spattering had ceased. Activity at N1 during 10-16 October was characterized by low-intensity explosions ejecting bombs and lapilli less than 80 m high.

Taal - Luzon (Philippines) : PHIVOLCS reported continuing unrest at Taal during 11-18 October. Upwelling gasses and hot fluids in the lake continued to be visible almost daily, and white steam emissions that generally rose as high as 1.5 km above the lake drifted in variable directions. Low-level background tremor and 1-9 daily volcanic earthquakes were recorded during 11-14 October. Sulfur dioxide emissions averaged 3,882 tonnes per day on 13 October. Activity increased during 14-15 October with six small phreatomagmatic bursts, each lasting 1-2 minutes long, and 26 volcanic earthquakes. Steam-and-gas plumes rose as high as 2.4 km and drifted NE and SE. Based on SIGMETS (Significant Meteorological statements) issued by the Ninoy Aquino International Airport, the Tokyo VAAC reported that during 14-15 October three ash plumes rose as high as 600 m (2,000 ft) a.s.l. and drifted NW. During 15-16 October one phreatomagmatic burst was recorded along with 12 volcanic earthquakes and nine periods of volcanic tremor, each 2-70 minutes long. Six periods of volcanic tremor, totaling almost 4.5 hours, were detected during 16-17 October, and sulfur dioxide emissions were 4,422 tonnes per day on 17 October. Ground deformation measurements continued to show slight inflation in the western half of the caldera and deflation in the eastern half.