A5048691898- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Advanced Numerical Methods in Computational Mathematics
- Geological formations and processes
- Geological Modeling and Analysis
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Seismology and Earthquake Studies
- Landslides and related hazards
- Reservoir Engineering and Simulation Methods
- Geology and Paleoclimatology Research
- Matrix Theory and Algorithms
- Orthopedic Surgery and Rehabilitation
- Geological and Geophysical Studies
- Geotechnical and Geomechanical Engineering
- Lattice Boltzmann Simulation Studies
- Computational Fluid Dynamics and Aerodynamics
- CO2 Sequestration and Geologic Interactions
- Distributed and Parallel Computing Systems
- Astro and Planetary Science
- Fluid Dynamics Simulations and Interactions
University of California, San Diego
2021-2025
Scripps Institution of Oceanography
2021-2025
University of Oxford
2017-2024
Siemens (Canada)
2023-2024
Argonne National Laboratory
2024
UC San Diego Health System
2021-2024
Tufts University
2023
Acadia Pharmaceuticals (United States)
2023
Czech Academy of Sciences, Institute of Geophysics
2022
Lovelace Health System
2019
Streptococcus pneumoniae, type 23F, resistant to penicillin (MIC, 2 micrograms/mL) and multiple other antimicrobic agents, was isolated from middle ear fluid of a child with otitis media attending day care center in Ohio. To determine the extent spread this strain, nasopharyngeal culture surveys were done, 52 carriers identified among 250 children index center. No found 121 at two centers same urban area. Use prophylactic doses antibiotics (P < .001) frequent use 0.001) risk factors for...
Calculating surface topography in geodynamic models is a common numerical problem. Besides other approaches, the so-called ‘sticky air’ approach has gained interest as free-surface proxy at top boundary. The often used free slip condition thereby vertically extended by introducing low density, viscosity fluid layer. This allows air/crust interface to behave similar manner true surface. We present here theoretical analysis that provides physical conditions under which sticky air valid...
Subduction of tectonic plates limited in lateral extent and with a free‐trailing tail, i.e., “free subduction,” is modeled three‐dimensional (3‐D) geometry. The models use nonlinear viscoplastic rheology for the subducting plate exhibit wide range behaviors depending on such characteristics as strength, width, thickness. We investigate time evolution this progressive rollback subduction, measure accompanying return flow upper mantle, quantify kinematics. Due to 3‐D geometry, allowed...
In this paper, we present a series of mathematical abstractions for seismologically relevant wave equations discretized using finite-element methods, and demonstrate how these can be implemented efficiently in computer code. Our motivation is to mitigate the combinatorial complexity when considering geophysical waveform modelling inversion, where variety spatial discretizations, material models, boundary conditions must considered simultaneously. We accomplish goal by first three distinct...
Many unresolved questions in geodynamics revolve around the physical behaviour of two-phase system a silicate melt percolating through and interacting with tectonically deforming host rock.Well-accepted equations exist to describe physics such systems several previous studies have successfully implemented various forms these numerical models.To date, most models magma dynamics focused on mantle flow problems therefore employed viscous creep rheologies suitable deformation properties rock...
The finite difference–marker-in-cell (FD-MIC) method is a popular in thermomechanical modeling geodynamics. Although no systematic study has investigated the numerical properties of method, numerous applications have shown its robustness and flexibility for large viscous deformations. model setups used geodynamics often involve smooth variations viscosity (e.g., temperature-dependent viscosity) as well discontinuous material interfaces). Establishing FD-MIC showing that scheme convergent...
Abstract The transient response of erosion to changes in rock uplift rate leads the preservation history long profiles rivers. However, extracting this information is nontrivial as channel steepness are result both spatial and temporal rate, well other factors such climate type. We exploit an analytical linear solution for river profile evolution tectonic investigate Taiwan. approach allows us solve inverse problem, efficiently a function space time, from digital elevation data. assess...
Simulations of long-term lithospheric deformation involve post-failure analysis high-contrast brittle materials driven by buoyancy and processes at the free surface. Geodynamic phenomena such as subduction continental rifting take place over millions year time scales, thus require efficient solution methods. We present pTatin3D, a geodynamics modeling package utilising material-point-method for tracking material composition, combined with multigrid finite-element method to solve...
Occurrence of multiple faults populations with contrasting orientations in oblique continental rifts and passive margins has long sparked debate about relative timing deformation events tectonic interpretations. Here, we use high-resolution three-dimensional thermo-mechanical numerical modeling to characterize the evolution structural style associated varying geometries rifting a layered lithosphere. Automatic analysis distribution active extensional shear zones at surface model demonstrates...
The purpose of this pictorial essay is to illustrate the radiologic spectrum imaging findings neuropathic osteoarthropathy. Typical include joint destruction, disorganization, and effusion with osseous debris. A variety other related osteoarthropathy such as resorption ends tubular bones fracture are shown. two prevailing theories for pathophysiology bone disease, neurovascular neurotraumatic theories, briefly described. Examples from diverse causes presented including syringomyelia, spinal...
Metamorphic Core Complexes form dome shaped structures in which the ductile crust is exhumed beneath a detachment fault. The 3D geometry, inferred by mapping schistosity crust, can be either elongated normal to stretching direction or along it. In first case, domes are interpreted as having formed during extension. However, second they strike‐slip, transpressive constrictive extensional structures, depending on geodynamic context. Numerical models of metamorphic core complexes published date...
Abstract We demonstrate via numerical simulations that the impact of a ~lunar‐sized body with Mars is capable creating hemispherical magma ocean upon cooling and solidification resulted in formation southern highlands thus Martian dichotomy. The giant may have contributed significant amount iron to core generated deep thermal anomaly led onset development volcanism highlands. Our model predicts several mantle plumes converging South Pole from equatorial regions as well new forming region...
Abstract Plasticity/failure is an essential ingredient in geodynamics models as earth materials cannot sustain unbounded stresses. However, many questions remain to appropriate of plasticity well effective solvers for these strongly nonlinear systems. Here we present some simplified model problems designed elucidate the issues involved description and solution viscoplastic currently used geodynamic modeling. We consider compression extension a layer overlying isoviscous introduce single...