Recent Submissions

  • Direct Method of Parameter Estimation for Steady State Flow in Heterogeneous Aquifers with Unknown Boundary Conditions, A 

    Author(s):Irša, Juraj; Zhang, Ye; Irša, Juraj; Zhang, Ye
    Date:2012-09-19
    We propose a novel direct method for estimating steady state hydrogeological model parameters and model state variables in an aquifer where boundary conditions are unknown. The method is adapted from a recently developed ...
  • Study of Conceptual Model Uncertainty in Large-Scale CO2 Storage Simulation, A 

    Author(s):Li, Shuiquan; Zhang, Ye; Zhang, Xu; Li, Shuiquan; Zhang, Ye; Zhang, Xu
    Date:2011-05-25
    In this study, multiscale permeability upscaling is combined with a sensitivity study of model boundary condition to identify an optimal heterogeneity resolution in developing a reservoir model to represent a deep saline ...
  • Crustal Structure Across the Costa Rican Volcanic Arc 

    Author(s):Hayes, Jorden L.; Holbrook, W. Steven; Lizarralde, Daniel; Van Avendonk, Harm J. A.; Bullock, Andrew D.; Mora, Mauricio M.; Harder, Steven H.; Alvarado, Guillermo E.; Hayes, Jorden L.; Holbrook, W. Steven; Lizarralde, Daniel; Van Avendonk, Harm J. A.; Bullock, Andrew D.; Mora, Mauricio M.; Harder, Steven H.; Alvarado, Guillermo E.
    Date:2013-04-29
    Island arcs are proposed to be essential building blocks for the crustal growth of continents; however, island arcs and continents are fundamentally different in bulk composition: mafic and felsic, respectively. The substrate ...
  • Estimating Oceanic Turbulence Dissipation from Seismic Images 

    Author(s):Holbrook, W. Steven; Fer, Ilker; Schmitt, Raymond W.; Lizarralde, Daniel; Klymak, Jody M.; Helfrich, Cody L.; Kubichek, Robert F.; Holbrook, W. Steven; Fer, Ilker; Schmitt, Raymond W.; Lizarralde, Daniel; Klymak, Jody M.; Helfrich, Cody L.; Kubichek, Robert F.
    Date:2013-08-01
    Seismic images of oceanic thermohaline fine structure record vertical displacements from internal waves and turbulence over large sections at unprecedented horizontal resolution. Where reflections follow isopycnals, their ...
  • Farallon Slab Detachment and Deformation of the Magdalena Shelf, Southern Baja California 

    Author(s):Brothers, Daniel; Harding, Alistair; González-Fernández, Antonio; Holbrook, W. Steven; Kent, Graham; Driscoll, Neal; Fletcher, John; Lizarralde, Dan; Umhoefer, Paul; Axen, Gary; Brothers, Daniel; Harding, Alistair; González-Fernández, Antonio; Holbrook, W. Steven; Kent, Graham; Driscoll, Neal; Fletcher, John; Lizarralde, Dan; Umhoefer, Paul; Axen, Gary
    Date:2012-05-08
    Subduction of the Farallon plate beneath northwestern Mexico stalled by ~12 Ma when the Pacific-Farallon spreading-ridge approached the subduction zone. Coupling between remnant slab and the overriding North American plate ...
  • Structure and Serpentinization of the Subducting Cocos Plate Offshore Nicaragua and Costa Rica 

    Author(s):Van Avendonk, Harm J. A.; Holbrook, W. Steven; Lizarralde, Daniel; Denyer, Percy Ch; Van Avendonk, Harm J. A.; Holbrook, W. Steven; Lizarralde, Daniel; Denyer, Percy Ch
    Date:2011-06-22
    The Cocos plate experiences extensional faulting as it bends into the Middle American Trench (MAT) west of Nicaragua, which may lead to hydration of the subducting mantle. To estimate the along strike variations of volatile ...
  • Seismic Reflection Imaging of Large-Amplitude Lee Waves in the Caribbean Sea 

    Author(s):Eakin, Daniel H.; Holbrook, W. Steven; Fer, Ilker; Eakin, Daniel H.; Holbrook, W. Steven; Fer, Ilker
    Date:2011-11-01
    Results from the first testing of the R/V Marcus Langseth as a platform for collecting seismic reflection data from the water column of the ocean demonstrate that large-amplitude lee waves can be acoustically mapped. A ...
  • First Images and Orientation of Fine Structure from a 3-D Seismic Oceanography Data Set 

    Author(s):Holbrook, W. Steven; Blacic, Tanya M.; Holbrook, W. Steven; Blacic, Tanya M.
    Date:2010-04-20
    We present 3-D images of ocean fine structure from a unique industry-collected 3-D multichannel seismic dataset from the Gulf of Mexico that includes expendable bathythermograph casts for both swaths. 2-D processing reveals ...
  • Seismic Imaging of a Thermohaline Staircase in the Western Tropical North Atlantic 

    Author(s):Fer, Ilker; Nandi, Papia; Holbrook, W. Steven; Schmitt, Raymond W.; Páramo, Pedro; Fer, Ilker; Nandi, Papia; Holbrook, W. Steven; Schmitt, Raymond W.; Páramo, Pedro
    Date:2010-07-02
    Multichannel seismic data acquired in the Lesser Antilles in the western tropical North Atlantic indicate that the seismic reflection method has imaged an oceanic thermohaline staircase. Synthetic acoustic modeling using ...
  • Seismic Evidence for Fluids in Fault Zones on Top of the Subducting Cocos Plate Beneath Costa Rica 

    Author(s):Van Avendonk, Harm J. A.; Holbrook, W. Steven; Lizarralde, Daniel; Mora, Mauricio M.; Harder, Steven H.; Bullock, Andrew D.; Alvarado, Guillermo E.; Ramírez, Carlos J.; Van Avendonk, Harm J. A.; Holbrook, W. Steven; Lizarralde, Daniel; Mora, Mauricio M.; Harder, Steven H.; Bullock, Andrew D.; Alvarado, Guillermo E.; Ramírez, Carlos J.
    Date:2010-01-01
    In the 2005 TICOCAVA explosion seismology study in Costa Rica, we observed crustal turning waves with a dominant frequency of ~10 Hz on a linear array of short-period seismometers from the Pacific Ocean to the Caribbean ...
  • Multicomponent Pre-Stack Seismic Waveform Inversion in Transversely Isotropic Media Using a Non-Dominated Sorting Genetic Algorithm 

    Author(s):Padhi, Amit; Mallick, Subhashis; Padhi, Amit; Mallick, Subhashis
    Date:2014-03-01
    Inversion of band- and offset-limited single component (P wave) seismic data does not provide robust estimates of subsurface elastic parameters and density. Multicomponent seismic data can, in principle, circumvent this ...
  • Broadband Anomalous Reflection Based on Gradient Low-Q Meta-Surface 

    Author(s):Pu, M.; Chen, Po; Wang, C.; Wang, Y.; Zhao, Z.; Hu, C.; Huang, C.; Luo, X.; Pu, M.; Chen, Po; Wang, C.; Wang, Y.; Zhao, Z.; Hu, C.; Huang, C.; Luo, X.
    Date:2013-05-30
    Gradient-index metamaterial is crucial in the spatial manipulation of electromagnetic wave. Here we present an efficient approach to extend the bandwidth of phase modulation by utilizing the broadband characteristic of ...
  • Anisotropic Meta-Mirror for Achromatic Electromagnetic Polarization Manipulation 

    Author(s):Pu, M.; Chen, Po; Wang, Y.; Zhao, Z.; Huang, C.; Wang, C.; Ma, X.; Luo, X.; Pu, M.; Chen, Po; Wang, Y.; Zhao, Z.; Huang, C.; Wang, C.; Ma, X.; Luo, X.
    Date:2013-04-01
    Polarization states are of particular importance for the manipulation of electromagnetic waves. Here, we proposed the design and experimental demonstration of anisotropic meta-mirror for achromatic polarization tuning. It ...
  • Far Field Observation and Theoretical Analyses of Light Directional Imaging in Metamaterial with Stacked Metal-Dielectric Films 

    Author(s):Wang, C.; Gao, P.; Tao, X.; Zhao, Z.; Pu, M.; Chen, Po; Luo, X.; Wang, C.; Gao, P.; Tao, X.; Zhao, Z.; Pu, M.; Chen, Po; Luo, X.
    Date:2013-07-01
    We report experimental observation of directional imaging of evanescent waves in layered metal-dielectric metamaterial. The investigation is performed with Ag/SiO2 multilayers combined with nano-object featured by a silicon ...
  • Evaluating WRF-Chem Aerosol Indirect Effects in Southeast Pacific Marine Stratocumulus During VOCALS-REx 

    Author(s):Saide, P. E.; Spak, S. N.; Carmichael, G.R.; Mena-Carrasco, M. A.; Yang, Q.; Howell, Robert R.; Leon, D. C.; Snider, J. R.; Bandy, A. R.; Collett, J. L.; Benedict, K. B.; de Szoeke, S. P.; Hawkins, L. N.; Allen, G.; Crawford, I.; Crosier, J.; Springston, S. R.; Saide, P. E.; Spak, S. N.; Carmichael, G.R.; Mena-Carrasco, M. A.; Yang, Q.; Howell, Robert R.; Leon, D. C.; Snider, J. R.; Bandy, A. R.; Collett, J. L.; Benedict, K. B.; de Szoeke, S. P.; Hawkins, L. N.; Allen, G.; Crawford, I.; Crosier, J.; Springston, S. R.
    Date:2012-03-29
    We evaluate a regional-scale simulation with the WRF-Chem model for the VAMOS (Variability of the American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx), which sampled the Southeast ...
  • EPOXI: Comet 103P/Hartley 2 observations from a worldwide campaign 

    Author(s):Howell, Robert R.; Howell, Robert R.
    Date:2011-06-10
    Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that are impossible with an in situ ...
  • Testing Waveform Predictions of 3D Velocity Models Against Two Recent Los Angeles Earthquakes 

    Author(s):Lee, En Jui; Chen, Po; Jordan, Thomas H.; Lee, En Jui; Chen, Po; Jordan, Thomas H.
    Date:2014-11-01
    Nearly half of the national seismic risk is located in Southern California, and about one-fourth is concentrated in Los Angeles County alone (Federal Emergency Management Agency [FEMA], 2000). To assess the seismic hazards ...
  • Full-3-D Tomography for Crustal Structure in Southern California Based on the Scattering-Integral and the Adjoint-Wavefield Methods 

    Author(s):Lee, En Jui; Chen, Po; Jordan, Thomas H.; Maechling, P. B.; Denolle, M. A. M.; Beroza, G. C.; Lee, En Jui; Chen, Po; Jordan, Thomas H.; Maechling, P. B.; Denolle, M. A. M.; Beroza, G. C.
    Date:2014-08-14
    We have successfully applied full-3-D tomography (F3DT) based on a combination of the scattering-integral method (SI-F3DT) and the adjoint-wavefield method (AW-F3DT) to iteratively improve a 3-D starting model, the Southern ...
  • Automating Seismic Waveform Analysis For Full 3-D Waveform Inversions 

    Author(s):Lee, En Jui; Chen, Po; Lee, En Jui; Chen, Po
    Date:2013-07-13
    We present a semi-automatic seismic waveform selection algorithm that can be used in full 3-D waveform inversions for earthquake source parameters and/or earth structure models. The algorithm is applied on pairs of observed ...
  • Rapid Full-Wave Centroid Moment Tensor (CMT) Inversion in a Three-Dimensional Earth Structure Model for Earthquakes in Southern California 

    Author(s):Lee, En Jui; Chen, Po; Jordan, Thomas H.; Wang, L.; Lee, En Jui; Chen, Po; Jordan, Thomas H.; Wang, L.
    Date:2011-07-01
    A central problem of seismology is the inversion of regional waveform data for models of earthquake sources. In regions such as Southern California, preliminary 3-D earth structure models are already available, and efficient ...

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