The tremor showed a light increase during the night, but it is not clear at the moment, if this is already a precursor to yet another paroxysm. [moins]

Tjörnes Fracture Zone (North of Iceland): The seismic swarm continues with a decreasing trend. "Only" 65 earthquakes have been counted so far today, the largest being a 3.3 event 14 km NE of Grímsey this morning. [moins]

The earthquake swarm is the result of release of tectonic stress that has accumulated in the crust and is being released at the moment. The area is one of the main so-called transform zones,- regions where the separating Eurasian and North-American tectonic plates move sideways along strike-slip faults rather than spreading apart directly as is the case in the main rift zones, where also the main volcanoes are located, because the opening movment here allows large batches of magma to rise easily.
... [read more] ... [show less] [moins]

The earthquake swarm is the result of release of tectonic stress that has accumulated in the crust and is being released at the moment. The area is one of the main so-called transform zones,- regions where the separating Eurasian and North-American tectonic plates move sideways along strike-slip faults rather than spreading apart directly as is the case in the main rift zones, where also the main volcanoes are located, because the opening movment here allows large batches of magma to rise easily.
The transform zones separate the rift zones at spreading plate boundaries at regular intervals in order to accommodate differential movements that are a result of the earth's curved surface where rigid plates move apart. In the transform zones, the sideways movement can produce much more strain in the rocks and has therefore the potential of larger earthquakes. [moins]

Shiveluch (Kamchatka): Moderate seismic activity and weak shallow earthquakes were registered. Hot avalanches (collapse of parts of the growing dome) and possibly explosions accompanying this process produced a plume rising to 20,000 ft (6 km) altitude yesterday. Strong degassing and steaming are continuous.
[moins]

Maybe intimidated by the recent lava fountains of Etna, the Prefecture of Catania has decided to take strict measures and published a strict ruleset what is allowed and what not, to protect us from the dangerous volcano:
... [read more] ... [show less] [moins]

Maybe intimidated by the recent lava fountains of Etna, the Prefecture of Catania has decided to take strict measures and published a strict ruleset what is allowed and what not, to protect us from the dangerous volcano:
4 volcanic hazard and alert levels, ranging from "Normal" to "Alarm" were defined and decide which kind of activity will be allowed in the future on the volcano. [moins]

Etna (Sicily, Italy): Etna's New SE Crater produced the 9th episode of lava fountaining (paroxysm) yesterday, and has now again fallen back to quiet, but for how long nobody knows. The intervals between the past paroxysms seem to follow an exponential trend of being roughly double each time... [moins]

In an Instituto Geofísico de Perú (IGP) report from 1 April, a photo showed a fumarolic plume rising above Sabancaya on 8 March. During the third week of March, a bluish colored plume rose 500 m above the crater, possibly indicating sulfur dioxide emissions. On 25 March the seismic network detected a continuing high rate of volcano-tectonic (VT) earthquakes and an increasing number of long-period (LP) events. On 27 March and 1 April VT earthquakes continued to be dominant and located below the NE sector of the crater. The number and amplitude of LP events did not change.
(from today's Smithsonian / USGS Weekly Volcanic Activity Report) [moins]

Civil protection assured the population that there was no danger, the Voice of Russia wrote. [moins]

The build-up phase lasted several hours, and produced many extremely powerful explosions of exploding liquid lava bubbles that threw bombs to all over the New SE crater cone.
After a few hours, these explosions finally merged into sustained lava fountains that rose hundreds of meters above the cone. A large ash plume drifted to the SE where heavy fallout of scoria occurred. [moins]

Also in this issue, read why Chaitén is probably more active than thought, and why Machin could be a good candidate for a next "Pinatubo" eruption. [moins]

It contains a reviewed summary of volcano activity during the past month, plus the new Volcano Express section with interesting articles on Machin and Chaiten volcanoes and a review of the pubvolc website.
[moins]

It is producing lava fountains and lava flows from the fissure vent of the New SE cone that descend into Valle del Bove.
[moins]

Etna (Sicily, Italy): Closer inspection of the "white lava" reported in yesterday's news revealed that these were so-called xenoliths, i.e. no lava at all, but pieces of sedimentary rock from strata underlying the volcano brought up by the rising magma. In this case, they are pieces of barely compacted beach sandstone, similar to the xenoliths ejected during the flank eruptions in 2011 and 2012, which are believed to have trapped a different (so-called eccentric) shallow magma chamber beneath the volcano. To find such xenoliths as produces of eruptions from the SUMMIT craters is highly unusual and could (*speculation*) indicate that the latest, violent, eruptive episode has actually involved a different magma reservoir as well. [moins]

Fresh snow has now covered much of the bombs from the recent eruption. [moins]

Etna (Sicily, Italy): (31 Mar) Etna volcano might have begun a process of deep transformation in its eruption style, new scientific studies suggest. [moins]

impact craters.
During a brief visit to the volcano from 22nd – 24th March, a small steam plume (emitted from two vents in the crater) was seen rising 300 – 400 M above the crater. Glow from the crater was seen at night time, which was from hot gas. [moins]