Volcano-tectonic activity along strctures of the unstable NE flank of Mt. Etna (Italy) and their possible origin (Articolo in rivista)

  • Volcano-tectonic activity along strctures of the unstable NE flank of Mt. Etna (Italy) and their possible origin (Articolo in rivista) (literal)
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Tibaldi A. 1, Groppelli G. 2 (2002)
    Volcano-tectonic activity along strctures of the unstable NE flank of Mt. Etna (Italy) and their possible origin
    in Journal of volcanology and geothermal research
  • Tibaldi A. 1, Groppelli G. 2 (literal)
Pagina inizio
  • 277 (literal)
Pagina fine
  • 302 (literal)
  • Impact factor (2002): 0,947; cited half-life: 8,4 (literal)
  • 115 (literal)
  • Pubblicazione del 2002 selezionata per CIVR (literal)
  • Questo lavoro è stato svolto nell’ambito di un progetto di ricerca sulle strutture attive del vulcano Etna finanziato dal MIUR. E’ stato condotto tramite rilevamenti di terreno di tipo stratigrafico, strutturale e morfologico, con particolare attenzione ai depositi olocenici e ai manufatti dislocati da faglie recenti e attive. La finalità è di contribuire alla comprensione dei movimenti in atto lungo il fianco orientale instabile del vulcano. (literal)
  • ISI Web of Science (WOS) (literal)
  • 1 Dip: Scienze Geologiche e Geotecnologie, Univ. Milano Bicocca; 2) CNR-IDPA (literal)
  • Volcano-tectonic activity along strctures of the unstable NE flank of Mt. Etna (Italy) and their possible origin (literal)
  • We describe the prehistoric-historic activity of the main and minor volcano-tectonic structures of the north-eastern flank of Mt. Etna, giving new data which provide a clearer view of how destabilized volcanoes react to magma pressure and gravity forces. Data are mostly based on new lithostratigraphic surveys and on offset measurements of late Pleistocene-Holocene deposits and historic man-made features. North-East Rift (NER) is a volcanic rift that has guided mostly explosive, but also secondary effusive, activity since the end of the Pleistocene. Monogenetic cones and explosive craters are strongly elongated and aligned along 66 main surface fractures and several others, hidden but inferred from sinkhole alignments. Opening direction is locally oblique, with a left-lateral component in the north-eastern segment of the rift. At the NE tip of the rift the movements are relieved by the normal left-lateral Pernicana Fault (PF), an 11-km-long structure comprising E-W fault segments connected by right-stepping en échelon faults. Our study demonstrates that the very high slip rates at a centennial scale of these structures are well constrained and similar (NER = 0.6-1.8 cm/y, PF = 0.5-2.2 cm/y) and have been also recognised in the Latest Pleistocene-Holocene (2.7 cm/y). The E-W Fiumefreddo Fault (FF) has normal left-lateral kinematics and a historic slip rate of 0.1 cm/y. Ripa della Naca Faults strike NE and are covered by unfaulted <15-ka-old lavas. Relative sinking to the SE gives a late Pleistocene slip-rate of 0.2 cm/y. Newly recognized NNE- to NE-striking active normal faults interfere at the PF-FF junction zone. The active East-North-East Rift, which is described in detail for the first time, is another volcanic rift affecting the eastern flank of Mt Etna. This rift shows left-lateral normal motions and has guided the location of several pyroclastic cones since at least the end of the Pleistocene. Stratigraphic and structural data prove the presence of a North-South Rift which has existed across the Mt Etna summit zone during at least the last 14 ka. Our data coupled with published seismological data indicate that these structures are the surface expressions of the seaward sliding of the eastern flank of Etna along two slip surfaces in a 2-component principal stress field, produced by gravity loading and magma intrusion. A shallower slide surface can be activated following dominance of gravity instability triggered by the mass of the volcano flank, or movements can occur along a deeper surface triggered by injection phases, or the two surfaces can move at the same time by a combination of effects. The existence of this double system of deformation can explain several apparently contradiction phenomenon such as discontinuous correlation of deformation, earthquakes and eruptions, and different earthquake foci, focal mechanisms and fault slip rates. (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:

Autore CNR di
Insieme di parole chiave di