Some Geophysics Applications to
which our visualization system is integrated.
- Pattern
Informatics
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PI
(Pattern Informatics)
is a technique developed at University of California, Davis
for analyzing earthquake seismic records to forecast regions
with high future seismic activity.
-
PI
analysis technique, formulated based on the physical and
theoretical understanding of complex, nonlinear fault systems,
to isolate emergent regions of coherent, correlated seismicity
prior to their occurrence in Southern California. This new
technique, the PI
index, identifies the characteristic patterns associated
with the shifting of small earthquakes from one location
to another through time prior to the occurrence of large
earthquakes. These identify regions of increased probability
of a future large earthquake, on an intermediate length
time scale.
- IEISS
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GeoFEST
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GeoFEST (Geophysical
Finite Element Simulation Tool)
is a two- and three-dimensional finite element software
package for the modeling of solid stress and strain in geophysical
and other continuum domain applications. GeoFEST uses stress-displacement
finite elements to model stress and strain due to elastic
static response to an earthquake event in the region of
the slipping fault, the time-dependent viscoelastic relaxation,
and the net effects from a series of earthquakes.
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The program
uses input and output in the form of formatted plain text
files; the data formats can be adapted to accommodate visualization
and graphically oriented i/o. The computational engine of
the program employs Crout factorization for the direct inversion
of the finite element matrices as well as conjugate gradient
for an iterative solution option. The physics models supported
by the code include isotropic linear elasticity and both
Newtonian and power-law viscoelasticity, via implicit/explicit
quasi-static time stepping. In addition to triangular, quadrilateral,
tetrahedral and hexahedral continuum elements, the program
supports split-node faulting, body forces and surface tractions.
Capabilities under development include frictional faulting
and buoyancy driving. Scientific applications of the code
include the modeling of static and transient co- and post-seismic
earth deformation, Earth response to glacial, atmospheric
and hydrological loading, and other scenarios involving
the bulk deformation of geologic media.
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Virtual California
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The VC (Virtual
California) approach to earthquake forecasting
is similar to the computer models used for weather forecasting,
said John Rundle, director of the UC Davis Computational
Science and Engineering Center, who has developed the model
with colleagues from the Jet Propulsion Laboratory and other
institutions. A previous forecast of earthquake hazards,
the Working Group on California Earthquake Probabilities,
used records of past earthquakes to calculate the probability
of future ones.
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The VC model includes 650 segments representing
the major fault systems in California, including the San
Andreas fault responsible for the 1906 San Francisco earthquake.
The simulation takes into account the gradual movement of
faults and how they interact with each other.
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