Normal faults, normal friction?
2001; Geological Society of America; Volume: 29; Issue: 10 Linguagem: Inglês
10.1130/0091-7613(2001)029 2.0.co;2
ISSN1943-2682
AutoresCristiano Collettini, Richard H. Sibson,
Tópico(s)Geological and Geochemical Analysis
ResumoResearch Article| October 01, 2001 Normal faults, normal friction? Cristiano Collettini; Cristiano Collettini 1Dipartimento di Scienze della Terra, Università di Perugia, Piazza dell'Università 1, 06123 Perugia, Italy Search for other works by this author on: GSW Google Scholar Richard H. Sibson Richard H. Sibson 2Department of Geology, University of Otago, P.O. Box 56, Dunedin, New Zealand Search for other works by this author on: GSW Google Scholar Geology (2001) 29 (10): 927–930. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history received: 19 Jan 2001 rev-recd: 29 May 2001 accepted: 18 Jun 2001 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Cristiano Collettini, Richard H. Sibson; Normal faults, normal friction?. Geology 2001;; 29 (10): 927–930. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 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 Debate continues as to whether normal faults may be seismically active at very low dips (δ < 30°) in the upper continental crust. An updated compilation of dip estimates (n = 25) has been prepared from focal mechanisms of shallow, intracontinental, normal-slip earthquakes (M > 5.5; slip vector raking 90° ± 30° in the fault plane) where the rupture plane is unambiguously discriminated. The dip distribution for these moderate-to-large normal fault ruptures extends from 65° > δ > 30°, corresponding to a range, 25° < 𝛉r < 60°, for the reactivation angle between the fault and inferred vertical σ1. In a comparable data set previously obtained for reverse fault ruptures (n = 33), the active dip distribution is 10° < δ = 𝛉r < 60°. For vertical and horizontal σ1 trajectories within extensional and compressional tectonic regimes, respectively, dip-slip reactivation is thus restricted to faults oriented at 𝛉r ≤ 60° to inferred σ1. Apparent lockup at 𝛉r ≈ 60° in each dip distribution and a dominant 30° ± 5° peak in the reverse fault dip distribution, are both consistent with a friction coefficient μs ≈ 0.6, toward the bottom of Byerlee's experimental range, though localized fluid overpressuring may be needed for reactivation of less favorably oriented faults. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Referência(s)