Séminaire ISTerre

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Seismological and gravimetric investigations on the Ivrea Geophysical Body: an outstanding crustal anomaly in the Western Alps (Europe)

jeudi 1er février 2024 - 11h00

Matteo Scarponi -  LGL TPE - Université Lyon 1
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The Western Alps, and the Ivrea-Verbano Zone in particular (IVZ, Piedmont, Italy), constitute one of the best open-air natural laboratories for the study of the continental crust, and orogen formation mechanisms. The IVZ exposes at the surface an almost unique, and nearly complete, cross-section of the continental crust, ranging from upper-crustal to lower-crustal (and mantle) composition rocks. Below the surface, multidisciplinary geophysical investigations show the existence of a dense and seismically fast structure. This outstanding crustal anomaly extends along the whole arc of the Western Alps, and it is known as the Ivrea geophysical body (IGB). Important scientific questions concern the IGB and its relation to the surface geological observations: what is the link between the anomalous IGB structure and the surface lower-crustal outcrops? Also, how is the IGB structure and composition changing at depth? New gravimetric and seismic data allow for further advances on this topic, via Bouguer gravity, seismic receiver functions and ambient noise analysis and modeling.

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Equipe organisatrice : Ondes et structures

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/8172559109

ID de réunion : 817 255 9109