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PHIVOLCS reported that during 22-28 October white plumes rose from Mayon's crater and drifted SW, WSW, WNW, and NW. A few volcanic earthquakes and rockfall signals were recorded during 23-25 and 28 October. Weak crater incandescence from the crater was noted at night on 22, 25, and 27 October. The Alert Level remained at 3 (on a 0-5 scale).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
IGP reported that during 21-27 October seismic activity at Sababcaya was low, and sporadic white and blue plumes rose as high as 1.2 km. Although a pilot reported an ash plume drifting E on 23 October, the Buenos Aires VAAC reported that ash was not detected in satellite images. The webcam showed gas-and-steam emissions, likely with diffuse ash, dissipating near the summit. On 25 October a pilot reported ash drifting E, but again satellite images did not detected ash.
Sources: Buenos Aires Volcanic Ash Advisory Center (VAAC) ,Instituto Geofísico del Perú (IGP)
AVO reported that partly cloudy satellite images and mostly cloudy webcam views showed nothing unusual at Shishaldin during 21-24 October. Seismicity increased on 25 October, and was followed by a tremor event and elevated surface temperatures detected at the summit in satellite images. Tephra deposits at the summit were noted in clear webcam images on 26 October, indicating that the event was energetic enough to eject material onto the flank from a depth of several hundred meters within the summit crater. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
KVERT reported that an eruption at Zhupanovsky likely continued during 17-24 October. Satellite images were obscured by clouds. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
INSIVUMEH reported that during 22-23 October avalanches originated from the lava-flow front active on the S flank of Santa María's Santiaguito lava-dome complex. Phreatic explosions occurred at the middle and lower parts of the lava flow. On 24 October a lahar descended the San Isidro (SW) drainage, a tributary of the Tambor River, carrying blocks 1-2 m in diameter. During 25-26 October a dense white plume rose 500 m and drifted SW. The most active part of the lava flow advanced S down the Nima I drainage. Another part had advanced 3 km E and was active in the San José finca. Block avalanches were produced from the lava-flow fronts.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
CENAPRED reported that during 22-28 October seismicity at Popocatépetl indicated continuing emissions of water vapor, gas, and small amounts of ash. Incandescence from the crater was observed at night. A small explosion at 0317 on 25 October ejected tephra 100 m onto the S flank. A steam-and-gas plume containing a small amount of ash rose 1.5 km above the crater and drifted SW. Ashfall was reported in Tetela del Volcán (20 km SW). An explosion at 0111 on 26 October ejected tephra 200 m onto the N flank. A steam-and-gas plume with diffuse ash rose 1.1 km and drifted NW. On 28 October an ash plume drifted WSW. The Alert Level remained at to Yellow, Phase Two.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that on 28 October ash plumes from Dukono rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted almost 85 km E.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
JMA reported that two explosions from Showa Crater at Aira Calderas Sakurajima volcano were detected during 20-24 October; an explosion on 24 October generated a plume that rose 3.2 km. The Alert Level remained at 3 (on a scale of 1-5). The Tokyo VAAC reported that on 24 October ash plumes rose to altitudes of 3-4.6 km (10,000-15,000 ft) a.s.l. and drifted E. During 25-26 October plumes rose to altitudes of 2.4-2.7 km (8,000-9,000 ft) a.s.l. and drifted E. On 28 October plume rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted S.
Sources: Japan Meteorological Agency (JMA) ,Tokyo Volcanic Ash Advisory Center (VAAC)
During 22-28 October HVO reported that Kilaueas 27 June NE-trending lava flow continued to be active. On 22 October a narrow lava flow (less than 50 m wide) that had overtaken the flow front during the previous few days moved into a small gully; the advancement rate was variable and sometimes as high as 300 m/day. Another breakout upslope continued to advance at a slower rate. On 24 October HVO scientists aboard an overflight measured the cross sectional area of the lava tube feeding the flow; the measurement suggested that the volume of lava being supplied to the flow from the Pu'u 'O'o vent had slightly increased. At approximately 0350 on 25 October lava crossed Apaa Street and continued to advance towards Pahoa town. Throughout the morning the flow moved down the Pahoa cemetery driveway and then turned SE into adjoining pasture. At 0900 on 26 October the flow was an estimated 140 m wide. The next day it had narrowed to 100 m wide and was about 570 m from Pahoa Village Road. At about 0200 on 28 October the flow had reached the first occupied residential property. The leading edge of the flow was less than 50 m wide but increased to 150 m upslope. At 1730 the lava flow was 310 m in a straight-line distance from Pahoa Village Road and about 900 meters in a straight-line distance from Highway 130. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning. According to news articles, Pahoa town, residence to 800-900 people, consists of small shops and homes. A school and a few roads were closed. Crews were building temporary access roads and trying to build berms to divert lava away from the highly traveled Highway 130. The circulating lava lake occasionally rose and fell in the deep pit within Halema'uma'u Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts tephra onto nearby areas; smaller particles may have been dropped several kilometers away. At Pu'u 'O'o Crater, glow emanated from several outgassing openings in the crater floor.
Sources: CBC,CNN ,US Geological Survey Hawaiian Volcano Observatory (HVO)
KVERT reported that during 17-24 October lava-dome extrusion onto Sheveluchs N flank was accompanied by ash explosions, incandescence, hot avalanches, and fumarolic activity. Satellite images detected a thermal anomaly over the dome during 17, 20, and 22 October; cloud cover prevented views of the volcano on the other days. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
It appears that an ongoing volcanic crisis along the Colombia-Ecuador border is beginning to look more significant. A sharp increase in the number and size of earthquakes under Cerro Negro de Mayasquer and Chiles has prompted the evacuation of over 12,000 people as both countries prepare for a potential eruption. What kind of eruption is difficult […]
The post Over 12,000 People Evacuated Near Cerro Negro de Mayasquer and Chiles appeared first on WIRED.
I apologize for being missing for the last week. The big Geological Society of America meeting is next week in Vancouver BC and not only am I giving a talk and co-chairing a session, but two of my students are presenting posters. Needless to say, things have been busy. My talk centers on what zircon […]
The post Eruption Update: Copahue, Poás, Sinabung, Kilauea, Holuhraun and Italy appeared first on WIRED.