BIROn - Birkbeck Institutional Research Online

    Orogen-scale uplift in the central Italian Apennines drives episodic behaviour of earthquake faults

    Cowie, P.A. and Phillips, R.J. and Roberts, Gerald P. and McCaffrey, K. and Zijerveld, L.J.J. and Gregory, L.C. and Faure Walker, J. and Wedmore, L.N.J. and Dunai, T.J. and Binnie, S.A. and Freeman, S.P.H.T. and Wilcken, K. and Shanks, R.P. and Huismans, R.S. and Papanikolaou, I. and Michetti, A.M. and Wilkinson, M. (2017) Orogen-scale uplift in the central Italian Apennines drives episodic behaviour of earthquake faults. Scientific Reports 7 , p. 44858. ISSN 2045-2322.

    [img]
    Preview
    Text
    19005.pdf - Published Version of Record
    Available under License Creative Commons Attribution.

    Download (2MB) | Preview

    Abstract

    Many areas of the Earth’s crust deform by distributed extensional faulting and complex fault interactions are often observed. Geodetic data generally indicate a simpler picture of continuum deformation over decades but relating this behaviour to earthquake occurrence over centuries, given numerous potentially active faults, remains a global problem in hazard assessment. We address this challenge for an array of seismogenic faults in the central Italian Apennines, where crustal extension and devastating earthquakes occur in response to regional surface uplift. We constrain fault slip-rates since ~18 ka using variations in cosmogenic 36Cl measured on bedrock scarps, mapped using LiDAR and ground penetrating radar, and compare these rates to those inferred from geodesy. The 36Cl data reveal that individual faults typically accumulate meters of displacement relatively rapidly over several thousand years, separated by similar length time intervals when slip-rates are much lower, and activity shifts between faults across strike. Our rates agree with continuum deformation rates when averaged over long spatial or temporal scales (104 yr; 102 km) but over shorter timescales most of the deformation may be accommodated by <30% of the across-strike fault array. We attribute the shifts in activity to temporal variations in the mechanical work of faulting.

    Metadata

    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 29 Jun 2017 09:02
    Last Modified: 25 Jun 2020 20:36
    URI: https://eprints.bbk.ac.uk/id/eprint/19005

    Statistics

    Downloads
    Activity Overview
    133Downloads
    86Hits

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item