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Fault-surface geometry controlled by faulting mechanisms: Experimental observations in limestone faults

2017; Geological Society of America; Volume: 45; Issue: 9 Linguagem: Inglês

10.1130/g39076.1

1943-2682

Amir Sagy, Telemaco Tesei, Cristiano Collettini,

Earthquake Detection and Analysis

Research Article| July 10, 2017 Fault-surface geometry controlled by faulting mechanisms: Experimental observations in limestone faults Amir Sagy; Amir Sagy 1Geological Survey of Israel, Malkei Israel 30, Jerusalem 9550161, Israel Search for other works by this author on: GSW Google Scholar Telemaco Tesei; Telemaco Tesei 2National Institute of Geophysics and Volcanology, Via di Vigna Murata 605, 00143 Rome, Italy Search for other works by this author on: GSW Google Scholar Cristiano Collettini Cristiano Collettini 2National Institute of Geophysics and Volcanology, Via di Vigna Murata 605, 00143 Rome, Italy3Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Amir Sagy 1Geological Survey of Israel, Malkei Israel 30, Jerusalem 9550161, Israel Telemaco Tesei 2National Institute of Geophysics and Volcanology, Via di Vigna Murata 605, 00143 Rome, Italy Cristiano Collettini 2National Institute of Geophysics and Volcanology, Via di Vigna Murata 605, 00143 Rome, Italy3Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy Publisher: Geological Society of America Received: 19 Feb 2017 Revision Received: 09 May 2017 Accepted: 31 May 2017 First Online: 10 Jul 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2017 Geological Society of America Geology (2017) 45 (9): 851–854. https://doi.org/10.1130/G39076.1 Article history Received: 19 Feb 2017 Revision Received: 09 May 2017 Accepted: 31 May 2017 First Online: 10 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Amir Sagy, Telemaco Tesei, Cristiano Collettini; Fault-surface geometry controlled by faulting mechanisms: Experimental observations in limestone faults. Geology 2017;; 45 (9): 851–854. doi: https://doi.org/10.1130/G39076.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Surface geometry is an essential component in faulting and earthquake dynamics, yet its evolution and interrelationship with friction are poorly understood. The geometric characteristics of smooth fault surfaces are herein investigated by combining direct shear experiment results with statistical analysis of the surface topography. Ground limestone surfaces, 20 × 20 cm, were sheared for 5 cm under constant normal load of 200 kN. After shear, the surfaces were structurally analyzed and scanned by laser profilometers. Elongated islands of shear zones are observed, characterized by grooves ploughed into the limestone surfaces and by layers of fine grain wear. Two distinctive types of topographic end members are recognized: rough wavy ridged zones that are the surface expression of penetrative cracking and fragmentation, and smooth slip surfaces reflecting localization of shear cataclastic flow and plasticity. The roughness of both end members is geometrically characterized using a power-law relationship between profile length parallel to the slip and its standard deviation from planarity. The power-law exponents are distinctively larger in fractured zones, >0.7, and lower, down to 0.35, in slip surfaces. The topographic variations in the deformed surfaces reflect fracturing and ductile processes, which occur simultaneously under shear. Their relative importance controls fault roughness evolution. We show that geometrical analysis can quantitatively distinguish between products of these different mechanisms. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.