Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/11445
DC FieldValueLanguage
dc.date.accessioned2018-03-23T08:50:20Z-
dc.date.available2018-03-23T08:50:20Z-
dc.date.issued2017-
dc.identifier.urihttp://hdl.handle.net/2122/11445-
dc.description.abstractStrain localization during coseismic slip in fault gouges is a critical mechanical process that has implications for understanding frictional heating, the earthquake energy budget and the evolution of fault rock microstructure. To assess the nature of strain localization during shearing of calcite fault gouges, high-velocity (vmax ¼ 1 m=s) rotary-shear experiments at normal stresses of 3e20 MPa were conducted under room-dry and wet conditions on synthetic calcite gouges containing dolomite gouge strain markers. When sheared at 1 m/s, the room-dry gouges showed a prolonged strengthening phase prior to dynamic weakening, whereas the wet gouges weakened nearly instantaneously. Microstructural analysis revealed that a thin (<600 mm) high-strain layer and through-going principal slip surface (PSS) developed after several centimeters of slip in both dry and wet gouges, and that strain localization at 1 m/s occurred progressively and rapidly. The strain accommodated in the bulk gouge layer did not change significantly with increasing displacement indicating that, once formed, the high-strain layer and PSS accommodated most of the displacement. Thus, a substantial strain gradient is present in the gouge layer. In water-dampened gouges, localization likely occurs during and after dynamic weakening. Our results suggest that natural fault zones in limestone are more prone to rapid dynamic weakening if water is present in the granular slipping zones.en_US
dc.language.isoengen_US
dc.relation.ispartofJournal of Structural Geologyen_US
dc.relation.ispartofseries/97 (2017)en_US
dc.titleThe effect of water on strain localization in calcite fault gouge sheared at seismic slip ratesen_US
dc.typearticle-
dc.description.statusPublisheden_US
dc.description.pagenumber104-117en_US
dc.identifier.doi10.1016/j.jsg.2017.02.007en_US
dc.description.obiettivoSpecifico7T. Struttura della Terra e geodinamicaen_US
dc.description.journalTypeJCR Journalen_US
dc.contributor.authorRempe, Marieke-
dc.contributor.authorSmith, Steven-
dc.contributor.authorMitchell, Thomas-
dc.contributor.authorHirose, Takehiro-
dc.contributor.authorDi Toro, Giulio-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italiaen_US
item.grantfulltextrestricted-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
Appears in Collections:Papers Published / Papers in press
Files in This Item:
File Description SizeFormat 
07_Rempe_et_al_JSG2017.pdf3.13 MBAdobe PDFView/Open
Show simple item record

Page view(s)

7
Last Week
0
Last month
0
checked on Dec 10, 2018

Download(s)

2
checked on Dec 10, 2018

Google ScholarTM

Check

Altmetric