Thursday, 30 October 2014

Volcanos

Roundup of Global Volcanic Activity

Stromboli (Eolian Islands, Italy): The effusive eruption that had started on 7 August seems to be ending: the lava flow emitted from the 650 m vent at the eastern base of the summit crater complex has decreased a lot two days ago and seems to have almost (or completely) stopped by today. INGV Catania reports strong degassing from the summit vents.

Bardarbunga (Iceland): Huge lava effusion rates continue to characterize the ongoing eruption at the Holuhraun fissure. There are no signs of the eruption ending soon. Earthquakes continue to be frequent under the central volcano's caldera.

Shiveluch (Kamchatka): An ash plume was reported last evening rising to approx. 30,000 ft (9 km) altitude and extending east (Tokyo VAAC). Most likely, a collapse of a part of the growing lava dome (or an explosion) occurred. In the first case, the ash plume is likely associated with a pyroclastic flow.

Kilauea (Hawai'i): This afternoon, the lava flow continued to move through private property and gets ever closer to the Pahoa village road. The leading edge of the flow was advancing about 10 m (11 yd) per hour this afternoon. It flow moved downslope about 125 m (136 yd) over the past 24 hours. The flow width was less than about 50 meters (55 yards) at the leading edge. As of 4:15 pm (29 Oct local time), the flow was about 185 m (202 yd) in a straight line distance from Pāhoa Village Road and about 775 meters (850 yd) in a straight-line distance from Highway 130. The lava lobe south of the main flow and upslope of Apa`a Street was not active today, but there were a couple of small breakouts on the north side of the flow that have advanced 70 to 110 m (75 to 120 yd) in the past day. (HVO's latest update)

Popocatépetl (Central Mexico): Overall, the volcano's activity has remained unchanged. Occasional explosions produce ash plumes that rise 1-2 km above the volcano. Yesterday, the volcano was a bit more active and had 5 such eruptions. Overnight incandescence is observed comming from the central and east sector of the crater.

Santiaguito (Guatemala): The viscous lava flow on the eastern side continues to advance slowly. No significant explosive activity from the lava dome has been reported recently.

Fuego (Guatemala): The volcano's activity has been stable over the past weeks. Mild to moderate strombolian explosions continue. Yesterday, the observatory reported 11 weak explosions (ash plumes rising up to 500 m) and 13 moderate ones (ash plumes up to 800 m). The plumes drifted SE and W for approx. 10 km before dissipating. Light ash fall occurred in downwind areas. The explosions at the summit produce incandescent avalanches on the upper slopes of the volcano.

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