Now showing items 1-10 of 10

  • A comparative study of two compact finite difference methods: standard vs. mimetic 

    Córdova, Luis Joaquin; Rojas, Otilio; Otero Calviño, Beatriz; Castillo, José (Sociedad Venezolana de Métodos Numéricos en Ingeniería, 2014)
    Conference report
    Restricted access - publisher's policy
    In this work, we implement two fourth-order compact finite differences (CFD) methods and use them to model wave propagation on a elastic string. The formulation of the first method employs the standard implicit CFD constructed ...
  • A new mimetic scheme for the acoustic wave equation 

    Solano, Freysimar; Guevara-Jordan, Juan; Rojas, Otilio; Otero Calviño, Beatriz; Rodriguez, R. (2016-03-15)
    Article
    Open Access
    A new mimetic finite difference scheme for solving the acoustic wave equation is presented. It combines a novel second order tensor mimetic discretizations in space and a leapfrog approximation in time to produce an explicit ...
  • A performance analysis of a mimetic finite difference scheme for acoustic wave propagation on GPU platforms 

    Otero Calviño, Beatriz; Frances, Jorge; Rodriguez Cruz, Robert; Rojas, Otilio; Solano, Freysimar; Guevara-Jordan, Juan (2017-02-01)
    Article
    Open Access
    Realistic applications of numerical modeling of acoustic wave dynamics usually demand high-performance computing because of the large size of study domains and demanding accuracy requirements on simulation results. Forward ...
  • Artificial neural networks as emerging tools for earthquake detection 

    Rojas, Otilio; Otero Calviño, Beatriz; Alvarado, Leonardo; Mus, Sergi; Tous Liesa, Rubén (2019)
    Article
    Open Access
    As seismic networks continue to spread and monitoring sensors become more ef¿cient, the abundance of data highly surpasses the processing capabilities of earthquake interpretation analysts. Earthquake catalogs are fundamental ...
  • Assessment of damage potential of seismic ground motions 

    Aguilar-Meléndez, Armando; De la Puente, Josep; Monterrubio-Velasco, Marisol; Rojas, Otilio; Moya-Sánchez, E. Ulises; Castillo-Reyes, Octavio (Barcelona Supercomputing Center, 2019-05-07)
    Conference report
    Open Access
  • Compact finite difference modeling of 2-D acoustic wave propagation 

    Córdova, Luis; Rojas, Otilio; Otero Calviño, Beatriz; Castillo, Jose (2016-03-15)
    Article
    Open Access
    We present two fourth-order compact finite difference (CFD) discretizations of the velocity–pressure formulation of the acoustic wave equation in 2-D rectangular grids. The first method uses standard implicit CFD on nodal ...
  • Low dispersive modeling of Rayleigh waves on partly staggered grids 

    Rojas, Otilio; Otero Calviño, Beatriz; Castillo, José; Day, Steven (2013-10-01)
    Article
    Restricted access - publisher's policy
    In elastic media, finite-difference (FD) implementations of free-surface (FS) boundary conditions on partly staggered grid (PSG) use the highly dispersive vacuum formulation (VPSG). The FS boundary is embedded into a ...
  • Mimetic Operators for Seismic Exploration 

    de la Puente, Josep; Rojas, Otilio; Ferrer, Miguel; Kormann, Jean (European Association of Geoscientists and Engineers, 2016-05-31)
    Conference report
    Open Access
    Mimetic operators are a kind of discrete operators which, on staggered grids, can accomplish "mimetic" properties analogous to their continuous counterparts. Furthermore, they can attain identical convergence order everywhere ...
  • Modeling seismic wave propagation using staggered-grid mimetic finite differences 

    Solano, Freysimar; Guevara-Jordan, Juan; González, Carlos; Rojas, Otilio; Otero Calviño, Beatriz (2017-04-12)
    Article
    Open Access
    Mimetic finite difference (MFD) approximations of continuous gradient and divergente operators satisfy a discrete version of the Gauss-Divergente theorem on staggered grids. On the mimetic approximation of this integral ...
  • Toward an automatic full-wave inversion: Synthetic study cases 

    Kormann, Jean; Rodriguez, Juan E.; Gutiérrez, Natalia; Ferrer, Miguel; Rojas, Otilio; de la Puente, Josep; Hanzich, Mauricio; Cela, Jose M. (Society of Exploration Geophysicists, 2016-12)
    Article
    Open Access
    Full-waveform inversion (FWI) in seismic scenarios continues to be a complex procedure for subsurface imaging that might require extensive human interaction in terms of model setup, constraints, and data preconditioning. ...