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Introduction
I am a researcher in the field of computational geophysics. My work includes development of the numerical earthquake simulator Virtual Quake, as well as studies of spatial forecast verification and aftershock-based ground motion prediction. I also developed a c++ implementation of the Tsunami Squares wave simulator for use in tsunami early warning.
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Publications
Publications (16)
A promising tsunami warning system outlined here links Total Electron Content (TEC) disturbances in the ionosphere detected by GNSS satellites to maps of inundated areas along the affected coastlines. This will be accomplished through a pipeline of earthquake, ionosphere, and tsunami simulations. The focus of this paper is to demonstrate the feasib...
Large subduction zone earthquakes often cause tsunamis, but observational data for hazard analysis is limited. Synthetic catalogs of seismically-generated tsunami scenarios can be created by pairing earthquake and wave simulations. Tsunami Squares is one such wave simulator, explicitly tracking water mass and momentum, allowing simulation of dry la...
The spatial distribution of aftershocks following major earthquakes has received significant attention due to the shaking hazard these events pose for structures and populations in the affected region. Forecasting the spatial distribution of aftershock events is an important part of the estimation of future seismic hazard. A simple spatial shape fo...
In this paper, we address the problem of verifying earthquake simulators with observed data. Earthquake simulators are a class of computational simulations which attempt to mirror the topological complexity of fault systems on which earthquakes occur. In addition, the physics of friction and elastic interactions between fault elements are included...
Utilizing earthquake source parameter scaling relations, we formulate an extensible slip weakening friction law for quasi-static earthquake simulations. This algorithm is based on the method used to generate fault strengths for a recent earthquake simulator comparison study of the California fault system. Here we focus on the application of this al...
Utilizing earthquake source parameter scaling relations, we formulate an extensible slip weakening friction law for quasi-static earthquake simulations. This algorithm is based on the method used to generate fault strengths for a recent earthquake simulator comparison study of the California fault system. Here we focus on the application of this al...
Since its introduction by Ogata (1988), The Epidemic Type Aftershock Sequence (ETAS) model has become a mainstay of post-seismic hazard hazard assessment. In its modern context, ETAS represents a family of models in which post-seismic aftershock activity is estimated from known aftershock scaling behaviors, most pointedly the Omori aftershock rate...
In light of growing demand for fast Global Navigational Satellite System tsunami early warning in the Pacific
Rim, computer simulations are being developed to play key roles at all stages. Virtual Quake is an
earthquake simulator that can rapidly produce long histories of earthquakes for complex fault systems,
including tsunamigenic regions, as wel...
In this paper, we address the problem of verifying earthquake simulators with observed data. Earthquake simulators are a class of computational simulations which attempt to mirror the topological complexity of fault systems on which earthquakes occur. In addition, the physics of friction and elastic interactions between fault elements are included...
We investigate the relative time scales associated with finite future
cosmological singularities, especially those classified as Big Rip cosmologies,
and the maximum predictability time of a coupled FRW-KG scalar cosmology with
chaotic regimes. Our approach is to show that by starting with a FRW-KG scalar
cosmology with a potential that admits an a...
In order to extract nuclear size information from the framework of
Glauber theory, calculated interaction and reaction cross sections are
compared to experimental data. Monte Carlo integration is frequently
used to facilitate these calculations. This Monte Carlo integration
utilizes nucleon coordinates distributed according to Gaussian and
Woods-Sa...
To extract various parameters of a nuclear density distribution, the
experimentally measured interaction cross-section is compared to
cross-sections calculated in various theoretical approaches. The
calculation of the interaction and reaction cross-section in the Glauber
Theory framework are usually performed using a Monte Carlo technique. In
the p...
We examine time scales for phase space orbits in a FRW cosmological model coupled to a scalar field. The cosmological model from the Einstein field equations are coupled to the Klein-Gordon equation for a spin zero scalar field with an interaction potential V(phi). The resulting cosmological equations are nonlinear in the scale cosmic parameter and...
