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Miolo, Matteo (2012) Analisi microstrustturale, geochimica e mineralogica di rocce di faglia sperimentali in dolomia. [Laurea triennale]

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Abstract

The study of earthquakes in carbonate rock is important not only in the Italian country (e.g. the earthquake of Friuli, Marche-Umbria, L’Aquila and the last in Emilia) but also in other countries. In particular, dolomite, if it is deformed with seismic velocities (approx. 1 m / s), shows a remarkable weakening (the coefficient of friction decreases from approx. 0.7 to 0.1) in the first centimeters of displacement: this mechanical behavior allows the emission of high seismic radiation by the fault. This work aims to understand the physical and chemical processes responsible for the weakening of faults in dolomite, during seismic ruptures, through the study of geochemical, mineralogical and microstructural fault rocks from experiments that reproduce the conditions of deformation typical of an earthquake (speed slipping of 1-3 m / s, normal efforts of tens of MPa and displacement several meters). The experiments were carried out with SHIVA (Slow to High Velocity Apparatus, National Institute of Geophysics and Volcanology, INGV, Rome). In order to identify the process of weakening, we selected two samples from experiments arrested after 0.04 meters (start of weakening) and 20 meters of displacement (weakening completed). The samples were analyzed EMPA (INGV, Rome), scanning electron microscope field emission SEM-FEG (INGV, Rome), powder X-Ray Diffraction (XRD, Department of Geosciences, Padua) and micro-Raman spectroscopy (Department of Chemical Sciences, Padua).

Item Type:Laurea triennale
Corsi di Laurea Triennale:Scuola di Scienze > Scienze geologiche
Uncontrolled Keywords:Dolomite, Attrito, Terremoti
Subjects:Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Area 04 - Scienze della terra > GEO/06 Mineralogia
Codice ID:41219
Relatore:Di Toro, Giulio
Correlatore:Nestola, Fabrizio
Data della tesi:21 September 2012
Biblioteca:Polo di Scienze > Dip. Geoscienze - Biblioteca
Tipo di fruizione per il documento:on-line per i full-text
Tesi sperimentale (Si) o compilativa (No)?:Yes

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Nicola De Paola, Takehiro Hirose, Tom Mitchell, Giulio Di Toro, Cecilia Viti and Toshihiko Shimamoto (2011), Fault lubrification and earthquake propagation in thermally unstable rocks. The Geological Society of America v. 39, 35-38 Cerca con Google

Andrea Billi and Giulio Di Toro (2008), Fault-related carbonate rocks and earthquake indicators: recent advances and future trends. Structural Geology, 1-24 Cerca con Google

Raehee Han, Toshihiko Shinamoto, Takehiro Hirose, Jin-Han Ree and Jun-Ichi Ando (2007), Ultalow friction of carbonate faults cause by thermal decomposition. Science, vol. 316, 878-881. Cerca con Google

Raehee Han, Takehiro Hirose and Toshihiko Shinamoto (2010), Strong velocity weakening and powder lubrification of simulated carbonate faults at seismic slip rates. Journal of geophysical research, vol 115, 1-23. Cerca con Google

Raehee Han, Toshihiko Shinamoto, Jun-Ichi Ando and Jun-Han Ree (2007): Seismic slip record in carbonate-bearing fault zones: an insight from high-velocity friction experiments on siderite gouge. The Geological Society of America v. 35 pag. 1131-1134. Cerca con Google

G. Di Toro, R. Han, T. Hirose, N. De Paola, S. Nielsen, K. Mizoguchi, S. Ferri, M. Cocco and T. Shimamoto ( March 2011) : Fault lubrification during the earthquakes. Nature, Vol 471, 494- 499 Cerca con Google

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