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  • 1
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    Fracture Reactivation and Magma Intrusion: The Case of the 1989 Fissure System at Mt Etna, Italy (2010)
    Details
    Publication Date: 2017-04-04
    Description: Fracture Reactivation and Magma Intrusion: The Case of the 1989 Fissure System at Mt Etna, Italy FALSAPERLA Susanna1, Fabrizio CARA2, Antonio ROVELLI2, Marco NERI1, Boris BEHNCKE1, Valerio ACOCELLA3 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123, Catania, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma1, Via di Vigna Murata 605, 00143 Roma, Italy 3 Dipartimento Scienze Geologiche Roma Tre. L. S.L. Murialdo 1, 00146 Roma, Italy We focus on the role of a dry (without lava emission) fracture system, consisting of extension fractures and normal faults, which opened at Mt Etna, Italy, during the 1989 flank eruption. The NNW-SSE fracture system is located on the mid-upper SE flank of the volcano, and has experienced significant seismic activity during the past two decades. By using excellent documented records of seismic and volcanic activity on 24 November 2006 (the latter encompassing Strombolian activity, lava fountaining, ash fallout, pyroclastic flows, and lava emission from multiple vents at the Southeast Crater), we analyze the interaction between seismic radiation and the afore-mentioned fracture system. Our results highlight the importance of this system in controlling the polarization properties of seismic waves 17 years after its formation. In addition, the SE end of the 1989 fracture zone extends into several active faults, suggesting that they represent a single long structure, which plays an important role in the volcano-tectonic dynamics of Etna. Finally, this study shows how fracture reactivation can also occur by means of magma intrusion, strongly controlling the transfer of magma within a volcanic edifice.
    Description: Published
    Description: Besse, Clermont-Ferrand, France
    Description: open
    Keywords: Magma Intrusion ; Volcanic tremor ; Mt. Etna ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 2
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    Evidence of Fracture Reactivation integrating Volcanological, Structural, and Seismic Data Recorded at Mt. Etna, Italy (2010)
    Cities on Volcanoes
    Details
    Publication Date: 2017-04-04
    Description: We merge volcanological, structural, and volcanic tremor data to shed light on a fissure system opened on the upper SE flank of Mt. Etna, Italy, in 1989. The system propagates to about 6 km from the Southeast Crater (SEC), and although it is formed by dry (non-eruptive) NNW-SSE fissures, it was active throughout several eruptive episodes after 1989, such as in 1991-1993 and (at least in part) in 2001, 2004-2005, and 2006. Particularly, we focus our attention on a paroxysmal eruptive episode on 24 November 2006, which encompassed different eruptive styles, such as lava fountaining and effusion, and violent Strombolian explosions, involving several eruptive vents on and near the SEC. This event was documented by detailed field and aerial surveys and remote video cameras. The characteristics of the seismic radiation are analyzed considering: frequency content, wavefield properties, and centroid location of the volcanic tremor source. The synoptic analysis of volcanic phenomena and volcanic tremor data document that: i) an aborted intrusion of magma rose to ~2000 m above sea level in the late evening of 24 November, along the NNW-SSE direction from below the SEC towards the 1989 fracture system, ii) the fissures opened in 1989 strongly affected, approximately 17 years after their formation, the modality of propagation of the seismic energy radiation within the upper volcanic edifice. Besides the role played by the 1989 system on the properties of seismic radiation in 2006, the present study allows to postulate probable links between contiguous fault systems in the upper SE flank of Mt. Etna. Based on the structural framework on a volcano-wide scale, our results do indeed sketch out a hitherto unknown continuity of some faults affecting the southeastern flank, which might also shed some light onto the complex phenomenon of flank instability in the eastern sector of the volcano.
    Description: Published
    Description: Puerto de la Cruz, Tenerife, Canary Islands, Spain
    Description: open
    Keywords: Fracture Reactivation ; Volcanological data ; Structural data ; Seismic data ; Mt. Etna ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
    Location Call Number Expected Availability
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