|Snapshot from embedded video showing the boiling lava lake at the vent in Holuhraun|
December 4, 2014 - EARTH - The following constitutes the new activity, unrest and ongoing reports of volcanoes across the globe.
Bardarbunga (Iceland)The eruption continues with little changes. While most of the lava now remains on top of the already emplaced lava field, more than 75 square km large, several lateral outbreaks are active as well.
The most active one, to the north, has advanced more than 450 m in a single day.
|Landsat-8 image of the area of the eruption (NASA)|
Seismic activity remains high under the volcano - yesterday, 2 earthquakes above magnitude 2 occurred under Bárðarbunga.
No significant earthquake activity occurs under the erupting dyke, suggesting the situation is stable.
WATCH: Holuhraun eruption - Bardarbunga volcanic complex.
Fogo (Cape Verde)The intensity of the eruption has strongly decreased, and the lava flows that have been destroying Portela seems to have at least temporarily stopped.
The situation remains critical inside the Cha caldera. The erupted lava collects in rapidly growing flows that destroy roads and houses near the caldera. The northern lava flow branch enter the village of Portela and destroyed and/or damaged several buildings, including the headquarters of the Fogo Nature Park.
|Map of the lava flow field (Source: INGT / facebook)|
|Lava flow in Portela village|
|Destruction of houses in Portela this morning. (Fogo News)|
|The eruptive vents at Fogo this morning (MuzikaTV)|
|Screenshot of eruption video showing the two active vents at Fogo|
|Explosive activity at the eruptive vents of Fogo (MuzikaTV)|
|Lava flows at Fogo (credit: Landsat image on Google Earth / Peter Webley)|
Nishino-shima (Volcano Islands, Japan)
The eruption continues and has been going for more than a year now.
|Steam plume from Nishinoshima on 27 Nov 2014 (Landsat 8 image / NASA Earth Observatory)|
It has enlarged the island to 1.89 square km (0.73 square miles). The highest point is now approx. 100 m above sea level.
Ruapehu (North Island)Recent measurements by NZ scientists indicate that the volcano's crater lake is currently in a cooling trend.
At 15 deg C, it has the lowest temperature recorded since April 2010.
According to GeoNet, the current cycle is part of the normal behavior of the lake.
It does not exclude the possibility of a sudden eruption, although makes it less likely. Heat flow and chemistry indicate the vents are not sealed from the lake.
"Most eruptions from Crater Lake occur when it is hot, however some have also occurred from a cool lake.
To put this in context, since 1965 there have been 35 eruptions through Crater Lake that have affected the wider summit area of Mt Ruapehu, only three of those came from cooler lakes (December 1979, December 1988 and September 2007). Hence it is very unlikely (9%) that an eruption of Mt Ruapehu affecting the wider summit area will occur while the lake temperature is less than 22°C."
The new lava lobe continues to advance and widen. As of this morning, it was only 4.3 km (2.7 miles) from Highway 130. A surge in lava supply resulted in an advance rate of 400 m per day!
At this rate it could reach Pahoa again by 12 December, if it follows the current flow path along the steepest slope to the north-northeast. If it follows another possible path, it could hit Ainaloa instead. It might even follow both paths, but it is too early to predict this.
Shishaldin (United States, Aleutian Islands)
Seismic activity remains elevated. According to the Alaska Volcano Observatory, "a low-level lava eruption is probably still occurring", although cloud cover prevents visual confirmation by satellite.
Cerro Negro de Mayasquer (Colombia)The volcano's alert level was decreased to Yellow. Seismic remains above background, but has decreased significantly recently.
A recent video by Robin Campion (Univ. Mexico) shows that the activity at the volcano is now magmatic in nature, i.e. fresh magma is being erupted as a small jet of mostly finely fragmented incandescent ash:
WATCH: Copahue volcano erupts.
Piton de la Fournaise (La Réunion)A new eruption could be under way at the volcano. An increase in seismic activity, inflation of the volcanic edifice, and SO2 gas mixed into the degassing plume, typical for a fresh magma intrusion at shallow depth have been detected by the volcano observatory (OVPF).
The prefecture raised the alert for the volcano again to "Vigilance", after it had been lowered on 1 Dec only.
The changed status means that police, civil protection and other authorities are on standby to react quickly if an eruption occurs. Access to Enclos Fouque is not yet closed to public, but hikers must stay on marked trails.
- Volcano Discovery.