Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7644
DC Field | Value | Language |
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dc.contributor.authorall | De Paola, N.; Durham University, | en |
dc.contributor.authorall | Hirose, T.; Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 200 Monobe-otsu, Kochi 783-8502, Japan | en |
dc.contributor.authorall | Mitchell, T.; Experimental Geophysics Laboratory, Institute for Geology, Mineralogy, and Geophysics, Ruhr-University Bochum, D-44780 Bochum, Germany | en |
dc.contributor.authorall | Di Toro, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.authorall | Viti, C.; Dipartimento di Geoscienze, Università degli Studi di Padova, Via Giotto 1, Padua 35137, Italy | en |
dc.contributor.authorall | Shimamoto, T.; Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1, Kagami-yama, Higashi-Hiroshima 739-8526, Japan | en |
dc.date.accessioned | 2012-01-27T13:53:27Z | en |
dc.date.available | 2012-01-27T13:53:27Z | en |
dc.date.issued | 2011 | en |
dc.identifier.uri | http://hdl.handle.net/2122/7644 | en |
dc.description.abstract | Experiments performed on dolomite or Mg-calcite gouges at seismic slip rates (v > 1 m/s) and displacements (d > 1 m) show that the frictional coeffi cient μ decays exponentially from peak values (mp ≈ 0.8, in the Byerlee’s range), to extremely low steady-state values (μss ≈ 0.1), attained over a weakening distance Dw. Microstructural observations show that discontinuous patches of nanoparticles of dolomite and its decomposition products (periclase and lime or portlandite) were produced in the slip zone during the transient stage (d < Dw). These observations, integrated with CO2 emissions data recorded during the experiments, suggest that particle interaction in the slip zone produces fl ash temperatures that are large enough to activate chemical and physical processes, e.g., decarbonation reactions (T = 550 C). During steady state (d ≥ Dw), shear strength is very low and not dependent upon normal stresses, suggesting that pressurized fl uids (CO2) may have been temporarily trapped within the slip zone. At this stage a continuous layer of nanoparticles is developed in the slip zone. For d >> Dw, a slight but abrupt increase in shear strength is observed and interpreted as due to fl uids escaping the slip zone. At this stage, dynamic weakening appears to be controlled by velocity dependent properties of nanoparticles developed in the slip zone. Experimentally derived seismic source parameter Wb (i.e., breakdown work, the energy that controls the dynamics of a propagating fracture) (1) matches Wb values obtained from seismological data of the A.D. 1997 M6 Colfi orito (Italy) earthquakes, which nucleated in the same type of rocks tested in this study, and (2) suggests similar earthquake-scaling relationships, as inferred from existing seismological data sets. We conclude that dynamic weakening of experimental faults is controlled by multiple slip weakening mechanisms, which are activated or inhibited by physicochemical reactions in the slip zone. | en |
dc.language.iso | English | en |
dc.relation.ispartof | Geology | en |
dc.relation.ispartofseries | /39 (2011) | en |
dc.subject | frcition | en |
dc.title | Fault lubrication and earthquake propagation in thermally unstable rocks | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 35-38 | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology | en |
dc.identifier.doi | 10.1130/G31398.1 | en |
dc.description.obiettivoSpecifico | 3.1. Fisica dei terremoti | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | De Paola, N. | en |
dc.contributor.author | Hirose, T. | en |
dc.contributor.author | Mitchell, T. | en |
dc.contributor.author | Di Toro, G. | en |
dc.contributor.author | Viti, C. | en |
dc.contributor.author | Shimamoto, T. | en |
dc.contributor.department | Durham University, | en |
dc.contributor.department | Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 200 Monobe-otsu, Kochi 783-8502, Japan | en |
dc.contributor.department | Experimental Geophysics Laboratory, Institute for Geology, Mineralogy, and Geophysics, Ruhr-University Bochum, D-44780 Bochum, Germany | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.department | Dipartimento di Geoscienze, Università degli Studi di Padova, Via Giotto 1, Padua 35137, Italy | en |
dc.contributor.department | Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1, Kagami-yama, Higashi-Hiroshima 739-8526, Japan | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Univ. Perugia, Italy | - |
crisitem.author.dept | Kochi Institute for Core Sample Research, Japan Agency Marine Earth Science and Technology, Kochi, Japan. | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
crisitem.author.dept | Dipartimento di Scienze della Terra Università degli Studi di Siena, | - |
crisitem.author.dept | Department of Earth and Planetary Systems Science, University of Hiroshima, Hiroshima, Japan. | - |
crisitem.author.orcid | 0000-0002-5397-3346 | - |
crisitem.author.orcid | 0000-0002-6618-3474 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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