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  • Journal article
    Stafford PJ, Berrill JB, Pettinga JR, 2009,

    New predictive equations for Arias Intensity from crustal earthquakes in New Zealand

    , Journal of Seismology, Vol: 13, Pages: 31-52, ISSN: 1383-4649
  • Journal article
    van Reeuwijk M, Mathias SA, Simmons CT, Ward JDet al., 2009,

    Insights from a pseudospectral approach to the Elder problem

    , WATER RESOUR RES, Vol: 45, W0441, ISSN: 0043-1397

    The aim of this paper is to clarify and circumvent the issue of multiple steady state solutions in the Elder problem. A pseudospectral method is used to avoid numerical error associated with spatial discretization. The pseudospectral method is verified by comparison to an analytical solution at Rayleigh number, Ra = 0, and by reproducing the three stable steady state solutions that are known to exist at Ra = 400. A bifurcation diagram for 0 < Ra < 400 which is free of discretization error, confirms that multiple steady states are indeed an intrinsic characteristic of the Elder problem. The existence of multiple steady states makes the Ra = 400 Elder problem less suitable for benchmarking numerical models. To avoid the multiple steady states, we propose a benchmark at Ra = 60. The results for this Low Rayleigh Number Elder Problem are presented and compared to simulations with the commercial groundwater modeling package FEFLOW. Correspondence between the pseudospectral model and FEFLOW is excellent.

  • Journal article
    Farrell PE, Piggott MD, Pain CC, Gorman GJ, Wilson CRet al., 2009,

    Conservative interpolation between unstructured meshes via supermesh construction

    , Computer Methods in Applied Mechanics and Engineering, Vol: 198, Pages: 2632-2642
  • Journal article
    Christeson GL, Collins GS, Morgan JV, Gulick SPS, Barton PJ, Warner MRet al., 2009,

    Mantle deformation beneath the Chicxulub impact crater

    , Earth and Planetary Science Letters, Vol: 284, Pages: 249-257, ISSN: 0012-821X
  • Book chapter
    Bommer JJ, Stafford PJ, 2009,

    Seismic hazard and earthquake actions

    , Seismic Design of Buildings to Eurocode 8, Editors: Elghazouli, Oxon, UK, Publisher: Spon Press, Pages: 6-46, ISBN: 978-0-415-44762-1
  • Journal article
    Stafford PJ, Sgobba S, Marano GC, 2009,

    An energy-based envelope function for the stochastic simulation of earthquake accelerograms

    , Soil Dynamics and Earthquake Engineering, Vol: 29, Pages: 1123-1133, ISSN: 0267-7261
  • Journal article
    Kontoe S, Zdravkovic L, Potts DM, 2009,

    An assessment of the Domain Reduction Method as an advanced boundary condition and common pitfalls in the use of conventional absorbing boundaries

    , International Journal for Numerical and Analytical Methods in Geomechanics, Vol: 33, Pages: 309-330
  • Journal article
    Bommer JJ, Stafford PJ, Alarcón JE, 2009,

    Empirical equations for the prediction of the Significant, Bracketed and Uniform duration of earthquake ground motion

    , Bulletin of the Seismological Society of America, Vol: 99, Pages: 3217-3233, ISSN: 0037-1106
  • Journal article
    Stafford PJ, Bommer JJ, 2009,

    Empirical equations for the prediction of the equivalent number of cycles of earthquake ground motion

    , Soil Dynamics and Earthquake Engineering, Vol: 29, Pages: 1425-1436
  • Journal article
    Zolghadr Jahromi H, Izzuddin BA, Zdravkovic L, 2009,

    A domain decomposition approach for coupled modelling of nonlinear soil–structure interaction

    , Computer Methods in Applied Mechanics and Engineering, Vol: 198, Pages: 2738-2749, ISSN: 1425-1655
  • Journal article
    Hampson GJ, Sixsmith PJ, Kieft RL, Jackson CA-L, Johnson HDet al., 2009,

    Quantitative analysis of net-transgressive shoreline trajectories and stratigraphic architectures: mid-to-late Jurassic of the North Sea rift basin

    , Basin Research, Vol: 21, Pages: 528-558

    This paper outlines the use of the shoreline trajectory concept to understand the controls on net-transgressive reservoir distribution and architecture in the highly productive Middle and Late Jurassic plays in the North Sea. Two broad groups of regressive–transgressive sandstone tongue are identified, with distinctive geometries, architectures and values of net-transgressive shoreline trajectory defined by the stacking arrangement of multiple tongues. Shoreface tongues were supplied by longshore-transported, marine-reworked sediment and are associated with low-to-moderate transgressive trajectories (typically <0.2°). These tongues have variable dip extents that decrease weakly as the angle of shoreline trajectory increases, relatively small thicknesses that increase weakly with the angle of transgressive trajectory, and partial or no overlap with underlying and overlying tongues down depositional dip. Deltaic-to-estuarine tongues were supplied directly by fluvial sediment and are associated with moderate-to-very high transgressive trajectories (typically >0.1°). These tongues have small dip extents, variable thicknesses that increase weakly with the angle of transgressive trajectory, and partial to full overlap with underlying and overlying tongues down depositional dip, although vertically stacked tongues are separated by thin mudstones over much of their extents. There is some overlap in geometry and stacking arrangement of these two groups of sandstone tongues. The temporal and spatial distribution of shoreface and deltaic-to-estuarine sandstone tongues reflects linked variations in tectonic subsidence and sediment routing within the evolving rift basin. Deltaic-to-estuarine tongues with moderate-to-very high transgressive trajectories were developed in rapidly subsiding fault-bounded depocentres supplied directly by fluvial sediment, whereas shoreface tongues with low-to-moderate transgressive trajectories characterised slowly subsiding faul

  • Conference paper
    Sgobba S, Stafford PJ, Marano GC, 2009,

    Seismological scenario-based envelope function for stochastic modelling of seismic signals

    , COMPDYN 2009: 2nd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
  • Journal article
    Fang F, Pain CC, Navon IM, Piggott MD, Gorman GJ, Farrell PE, Allison PA, Goddard AJHet al., 2009,

    A POD reduced-order 4D-Var adaptive mesh ocean modelling approach

    , Int. J. Numer. Meth. Fluids, Vol: 60, Pages: 709-732

    This paper presents a novel approach for inverting a complex ocean model via a proper orthogonal decomposition. The inversion is achieved through the construction of an adjoint model and used to assimilate data in a similar manner to that used in weather forecasting. This is an incredibly important capability for an ocean model, however it is both complex to construct and also can be computationally expensive. The approach proposed here addresses both of these important issues by constructing an efficient and easy to compute adjoint directly from the reduced order model. The approach is demonstrated by inverting for initial conditions in an ocean gyre simulation. The methodology proposed here led directly to the award of a £1M EPSRC grant (EP/I00405X) to develop reduced order and adjoint models for coastal oceanography. Cited 11 times.

  • Journal article
    Mathias SA, van Reeuwijk M, 2009,

    Hydraulic fracture propagation with 3-D leak-off

    , TRANSPORT POROUS MED, Vol: In Press, ISSN: 0169-3913
  • Conference paper
    Kontoe S, Zdravkovic L, Potts DM, Menkiti COet al., 2009,

    Comparison of constitutive models through a case study on seismic response of tunnels

    , International Conference on Performance-Based Design in Earthquake Geotechnical Engineering – from case history to practice., Pages: 1051-1059
  • Journal article
    Fang F, Pain CC, Navon IM, Gorman GJ, Piggott MD, Allison PA, Farrell P, Goddard AJHet al., 2009,

    A POD reduced order unstructured mesh ocean modelling method for moderate Reynolds number flows

    , Ocean Modelling, Vol: 28, Pages: 127-136, ISSN: 1463-5003
  • Conference paper
    Taborda D, Kontoe S, Zdravkovic L, Potts DMet al., 2009,

    Application of cyclic nonlinear elastic models to site response analysis

    , 1st International Symposium on Computational Geomechanics, Pages: 956-966
  • Conference paper
    Stafford PJ, Bommer JJ, 2009,

    Theoretical consistency of common record selection strategies in Performance-based Earthquake Engineering

    , 1st ACES Workshop on Advances in Performance-based Earthquake Engineering
  • Journal article
    Aldama-Bustos G, Bommer JJ, Fenton CH, Stafford PJet al., 2009,

    Probabilistic seismic hazard analysis for rock sites in the cities of Abu Dhabi, Dubai and Ra's Al Khaymah, United Arab Emirates

    , GEORISK, Vol: 3, Pages: 1-29, ISSN: 1749-9518
  • Journal article
    Wallace LM, Reyners M, Cochran U, Bannister S, Barnes P, Berryman K, Downes G, Eberhart-Phillips D, Fagereng A, Ellis S, Nicol A, McCaffrey R, Beavan RJ, Henrys S, Sutherland R, Barker DHN, Litchfield N, Townend J, Robinson R, Bell RE, Wilson K, Power Wet al., 2009,

    Characterizing the seismogenic zone of a major plate boundary subduction thrust: Hikurangi Margin, New Zealand

    , Geochemistry, Geophysics, Geosystems, Vol: 10

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