SEMINARIO Prof. Andrea FESTA: "Mélanges and seismicity: Can subduction of chaotic mass transport deposits control the mechanics of shallow megathrust?"

Nell'ambito del corso di dottorato M3ES, il giorno

Lunedì 5 febbraio, alle 15.00
in aula Uint5 del Dipartimento di Scienze Chimiche e Geologiche

il prof. Prof. Andrea Festa 
(Università di Torino)  

terrà il seminario:
"Mélanges and seismicity: Can subduction of chaotic mass transport deposits control the mechanics of shallow megathrust?" 

Scarica la locandina

Per informazioni:
francesca.remitti@unimore.it

Abstract:
The role played by the incorporation of heterogeneous mass transport deposits (i.e., sedimentary mélanges or olistostromes) in controlling the seismic style along subduction plate interface has been rarely investigated and still remains an open question. This talk presents a critical appraisal of the role of subducted, medium (10-1000 km2) to giant (≥1000 km2) and heterogeneous, mud-rich mass transport deposits (MTDs) in seismic behavior and mechanisms of shallow earthquakes along a subduction plate interface (or subduction channel) at convergent margins. Our observations from exhumed ancient subduction complexes around the world show that incorporation of mud-rich MTDs with a “chaotic” internal fabric into subduction zones strongly modifies the internal architecture of a subduction plate interface and the physical properties of subducted material, affecting the mechanics of shallow megathrusts and the related seismicity. Our findings provide new crucial information about earthquake hazard evaluation and mitigation in subduction zone environments at active continental margins.