Friction during earthquakes: 25 years of experimental studies

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Show simple item record Di Toro, Giulio Aretusini, Stefano Cornelio, C Nielsen, S Spagnuolo, Elena Nuñez Cascajero, Arantzazu Tapetado Moraleda, Alberto Vázquez García, María Carmen 2022-03-22T09:07:22Z 2022-03-22T09:07:22Z 2021-10-27
dc.identifier.bibliographicCitation Toro, G. D., Aretusini, S., Cornelio, C., Nielsen, S., Spagnuolo, E., Núñez-Cascajero, A., Tapetado, A., & Vázquez, C. (2021). Friction during earthquakes: 25 years of experimental studies. IOP Conference Series: Earth and Environmental Science, 861(5), 052032.
dc.description.abstract Dynamic fault strength τ (rock friction in the broad sense) and its evolution with seismic slip and slip rate are among the most relevant parameters in earthquake mechanics. Given the large slip rate (1 m s−1 on average), displacement (up to tens of meters), effective stress (tens of MPa), typical of seismic faulting at depth, thermo-mechanical effects become outstanding: dynamic fault strength is severely affected by fluid and rock phase changes, extreme grain size reduction, and the production of amorphous and unstable materials in the slipping zone. Here, first we will summarize the most relevant findings about dynamic fault strength during seismic slip mainly obtained thanks to the exploitation of dedicated experimental machines (i.e., rotary shear apparatus). However, the interpretation of this experimental dataset remains debated because of technical limitations which impede us to measure fundamental parameters such as temperature, strain rate, pore fluid pressure and grain size in the slipping zone. Without a sound estimate of these physical parameters, any constitutive law proposed to describe the evolution of dynamic fault strength during simulated seismic slip remains speculative. Then, we will discuss the results of some recent experiments which exploit new technical approaches to overcome the main limitations of the previous studies. The experimental approach, together with field studies of the geometry and architecture of exhumed faults and modelling, remains our most powerful tool to investigate seismic-related deformation mechanisms in both natural and human-induced earthquakes.
dc.format.extent 7
dc.language.iso eng
dc.publisher IOP Science
dc.rights © 2021 The authors
dc.rights Atribución 3.0 España
dc.title Friction during earthquakes: 25 years of experimental studies
dc.type conferenceObject
dc.subject.eciencia Geología
dc.rights.accessRights openAccess
dc.type.version publishedVersion
dc.relation.eventdate 2021-10-21 2021-10-25
dc.relation.eventnumber 11
dc.relation.eventplace Beijing
dc.relation.eventtitle 11th Conference of Asian Rock Mechanics Society
dc.relation.eventtype poster
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 7
dc.identifier.publicationtitle IOP Conference Series: Earth and Environmental Science
dc.identifier.publicationvolume 861
dc.identifier.uxxi CC/0000033259
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