The INGV comments on the activity of Etna during the last five months, when it appears again.
This activity was characterized by degassing from summit craters and sporadic low ash emissions from the saddle cone of the NSEC.
Degassing marked the 7 August 2016 vent of the Voragine and the internal pit of the Bocca Nuova. The NE crater exhibited a smoking activity.
Since September 20, sporadic ash emissions have resumed at the NSEC saddle cone at intervals ranging from a few hours to over a week, sometimes accompanied by the ejection of incandescent pyroclastic materials.
ETNA - 26.10.2017 / 18:40 - © Credit Photo Benito Morabito Diretta CieloAstronomical Observatory - Diretta Streaming
Etna, the Bocca Nuova degassing on 06.10.2017 / 13h50 GMT - photo © Joseph Nasi / Butterfly Helicopters
On November 24, small NSEC emissions increased in frequency, and are still noticed on the morning of November 25th.
Boris Behncke reports the absence of traces of new magma on the surface at the moment.
Sources: INGV Catania & Boris Behncke
Etna - ash emission at the NSEC on 24.11.2017 - © Photo Credit Benito Morabito Diretta Cielo Astronomical Observatory
Etna - ash emission at the NSEC on 24.11.2017, seen from the INGV headquarters - © Photo Boris Behncke
For the volcanophiles who prepare for their journey in 2018, the USGS has put online an interesting document: "Geologic field-trip guide to the volcanic and hydrothermal landscape of the Yellowstone Plateau".
"Geologic field-trip guide to the volcanic and hydrothermal landscape of the Yellowstone Plateau". - References of the pdf below
As commented :
Over six days, this field trip presents an intensive overview into volcanism, tectonism, and hydrothermal activity on the Yellowstone Plateau. Field stops are linked directly to conceptual models related to monitoring of the various volcanic, geochemical, hydrothermal, and tectonic aspects of the greater Yellowstone system. Recent interest in young and possible future volcanism at Yellowstone as well as new discoveries and synthesis of previous studies, (for example, tomographic, deformation, gas, aeromagnetic, bathymetric, and seismic surveys), provide a framework in which to discuss volcanic, hydrothermal, and seismic activity in this dynamic region.
Source : Morgan, L.A., Shanks, W.C.P., Lowenstern, J.B., Farrell, J.M., and Robinson, J.E., 2017, Geologic field-trip guide to the volcanic and hydrothermal landscape of the Yellowstone Plateau: U.S. Geological Survey Scientific Investigations Report 2017–5022–P, 100 p., https://doi.org/10.3133/sir20175022P.
ISSN: 2328-0328 (online)