Volcanic activity worldwide 11 Feb 2014: Kelud, Mammoth Mountain, Etna, Kilauea
Tuesday Feb 11, 2014 20:11 PM |
Photo of the pyroclastic flow on Etna this morning (Photo: Mike Schüler, facebook)
Comparison of thermal images showing the evolution of the eastern flank of the NSEC during the past 36 hours
Seismic activity at Kelut volcano during the past weeks (VSI)
Etna (Sicily, Italy): A (for Etna standards) very large pyroclastic flow descended this morning on the eastern flank from the area of the new vents that opened yesterday on the eastern side beneath the summit of the New SE crater.
Location of recent earthquakes near Mammoth Mountain (CA)
Most likely, explosive lava-snow interaction and destabilization of this area where new magma was pushing its way outside caused a sector to collapse and descend the Valle del Bove flank as a hot turbulent avalanche (=pyroclastic flow). It reached the bottom of Valle del Bove in less than 3 minutes and traveled about 3 km length, which implies an average speed of 60 km/h, with maximum speed probably in excess of 100 km/h (approx. 65 mph).
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The following is a comparison of some characteristic stages of the vents and lava flows on the eastern flank of the New SE cone:
Kelud (East Java): (11 Feb) VSI raised the alert status to the second highest level 3 (out of 4), "Siaga" (meaning eruption warning). In its latest report, VSI informs that an ongoing slight deformation, suggesting magma intrusion, has been detected since September and that a strong increase in seismic activity started on 7 February. A seismic swarm occurred with hypocenters between 1.5-3.5 km depth beneath the summit area.
The increased seismic activity triggered the decision to raise the status once more, after the volcano had put on alert level 2 already on 2 Feb.
Kilauea (Hawai'i): (10 Feb) 32 earthquakes were strong enough to be located beneath Kilauea Volcano in the past 24 hours, including 21 scattered broadly beneath the summit caldera.
Mammoth Mountain (California, USA): An small earthquake swarm at shallow depths (around 5 km) occurred east of Mammoth Mountain during the past week. The largest quake was a magnitude 3.0 event on 5 Feb.
This latest (of many in the past years) seismic swarm is weak in terms of number and energy of earthquakes compared to long-term averages of seismic activity at the Long Valley caldera, an active volcanic system that is capable to erupt (probably not in a near future, though) and is being closely monitored by very experienced staff from USGS.
It could be related to a small intrusion of magma, but is unlikely to be a precursor of a new eruption in any near future. USGS has not changed the status code of the volcanic system (at green=normal).
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Etna (Sicily, Italy): After a short pause with likely no (or almost no) eruptive activity during 1-2 Feb, the volcano started renewed lava effusion from the fissure vent at the eastern foot of the New SE crater yesterday, followed by the onset of weak explosive activity(ash emissions) from the New SE crater this afternoon. ... [more]
Monday, Feb 03, 2014