Journal: Tectonophysics

Abbreviation

Tectonophysics

Publisher

Elsevier

Journal Volumes

ISSN

0040-1951
1879-3266

Description

Filters

Reset filters

Search Results

Publications 1 - 10 of 202
  • Development of igneous layering during growth of pluton
    Item type: Journal Article
    Pons, J.; Barbey, P.; Nachit, H.; et al. (2006)
    Tectonophysics
  • Differences between magnetic and mineral fabrics in low-grade, cleaved siliciclastic pelites
    Item type: Journal Article
    Debacker, Timothy N.; Hirt, Ann Marie; Sintubin, Manuel; et al. (2009)
    Tectonophysics
  • Interpreting magnetic fabrics in amphibole-bearing rocks
    Item type: Journal Article
    Biedermann, Andrea R.; Kunze, Karsten; Hirt, Ann Marie (2018)
    Tectonophysics
  • Modeling frictional precursory phenomena using a wear-based rate- and state-dependent friction model in the laboratory
    Item type: Journal Article
    Selvadurai, Paul Antony; Galvez, Percy; Mai, Paul Martin; et al. (2023)
    Tectonophysics
    We examine numerical models that employ the rate-and-state frictional (RSF) framework to investigate earthquake sequences using laboratory driven descriptions of heterogeneous frictional properties. Using previously obtained experimental measurement of roughness, we observed that wear produced a bimodal Gaussian distribution of surface heights, which we hypothesized produced spatial heterogeneity of the critical slip distance Dc. In this numerical study, the fault surface was binarized into discrete smooth or rough sections, producing a barcode style version of frictional heterogeneity. The fault was predominantly rough except for two dominant asperities (A1 and A2) representative of larger polished sections. We simulated the resistive effect of increasing the fracture energy (toughness) of the rough barriers while maintaining constant properties of the embedded brittle/smooth asperities. Our numerical simulations generated burst-like seismic events and aseismic transients throughout the interseismic phase. At the late interseismic phase, bursts of seismicity (foreshocks) interacted with the accelerating preslip region at the transition to the preseismic (nucleation) phase. At lower levels of toughness heterogeneity, the slip rate increase was roughly inversely proportional to the time-to-failure tf for larger events. As fault toughness was increased, the dominant asperities initiated nucleation and thus force deviations of the fault from the smooth 1/tf acceleration observed for the homogeneous case, producing a rate-dependent cascade response. The calculations were validated by comparing two independently measured metrics from the experiments: (1) The expansion rate of slow ruptures during the interseismic and preslip phase and (2) the scalar seismic moment and source dimensions. While our study does not address the scaling problem, these results help to understand laboratory experiments that investigate transition to the preseismic (nucleation) phase during complex earthquake sequences.
  • An experimental study of the role of shear deformation on partial melting of a synthetic metapelite
    Item type: Journal Article
    Tumarkina, Elizaveta; Misra, Santanu; Burlini, Luigi; et al. (2011)
    Tectonophysics
  • Magnetic anisotropy of calcite at room-temperature
    Item type: Journal Article
    Schmidt, Volkmar; Günther, Detlef; Hirt, Ann Marie (2006)
    Tectonophysics
  • The competing effects of olivine and orthopyroxene CPO on seismic anisotropy
    Item type: Journal Article
    Bernard, Rachel E.; Schulte-Pelkum, Vera; Behr, Whitney M. (2021)
    Tectonophysics
    Orthopyroxene is the second most abundant mineral in the upper mantle and, like olivine, can form crystallographic preferred orientations (CPO) during mantle deformation that may influence mantle seismic anisotropy. Here we use a compilation of 21 peridotites in which both olivine and orthopyroxene CPOs are preserved to document the range of orthopyroxene CPO types and to explore their effects on seismic anisotropy of peridotites. In addition to four previously published orthopyroxene CPO types, this study establishes three new CPO types, two of which result in orthopyroxene fast axes aligned parallel to the lineation and the direction of mantle shear/flow. We calculate bulk elastic tensors for each sample from the measured olivine and orthopyroxene CPOs, and use those in turn to calculate Vp and Vs velocities and anisotropy percentages. In order to explore the relative influence of olivine and orthopyroxene on anisotropy, these properties were calculated for a range of possible modal percentages, from 100% olivine to 100% orthopyroxene. While the effect of orthopyroxene CPO appears to be a negligible influence on the orientation of bulk seismic fast axes, the presence of increasing orthopyroxene decreases the anisotropic signal overall. However, at very low olivine modal percentages, olivine and orthopyroxene can be mutually destructive, where the addition of olivine to a mostly orthopyroxene rock can actually decrease anisotropy.
  • Multiarchive paleoseismic record of late Pleistocene and Holocene strong earthquakes in Switzerland
    Item type: Journal Article
    Becker, A.; Ferry, M.; Monecke, K.; et al. (2005)
    Tectonophysics
  • Seismic structure and activity of the north-central Lesser Antilles subduction zone from an integrated approach
    Item type: Journal Article
    Laigle, M.; Hirn, A.; Sapin, M.; et al. (2013)
    Tectonophysics
  • Numerical modelling of inversion tectonics in fold-and-thrust belts
    Item type: Journal Article
    Granado, Pablo; Ruh, Jonas Bruno (2019)
    Tectonophysics
Publications 1 - 10 of 202