A Webbased system for modeling multiscale earthquake processes

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A Web-based system for modeling multi-scale
earthquake processes
The Solid Earth Research Virtual Observatory
Andrea Donnellan, John Rundle, Geoffrey Fox,
Marlon Pierce, Dennis McLeod, Jay Parker, Robert
Granat, Terry Tullis, Lisa Grant
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Objectives

• IT approaches Integrate multiple scales into
  computer simulations.
• Web services Simplified access to data,
  simulation codes, and flow between simulations of
  varying types.

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Solid Earth Research Virtual Observatory (iSERVO)

• Web-services (portal) based Problem Solving
  Environment (PSE)
• Couples data with simulation, pattern recognition
  software, and visualization software
• Enable investigators to seamlessly merge multiple
  data sets and models, and create new queries.
• Data
• Spaced-based observational data
• Ground-based sensor data (GPS, seismicity)
• Simulation data
• Published/historical fault measurements
• Analysis Software
• Earthquake fault
• Lithospheric modeling
• Pattern recognition software

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Philosophy

• Store simulated and observed data
• Archive simulation data with original simulation
  code and analysis tools
• Access heterogeneous distributed data through
  cooperative federated databases
• Couple distributed data sources, applications,
  and hardware resources through an XML-based Web
  Services framework.
• Users access the services (and thus distributed
  resources) through Web browser-based Problem
  Solving Environment clients. 
• The Web services approach defines standard,
  programming language-independent application
  programming interfaces, so non-browser client
  applications may also be built.

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SERVOGrid Basics

• Under development in collaboration with
  researchers at JPL, UC-Davis, USC, and Brown
  University.
• Geoscientists develop simulation codes, analysis
  and visualization tools.
• We need a way to bind distributed codes, tools,
  and data sets.
• We need a way to deliver it to a larger audience
• Instead of downloading and installing the code,
  use it as a remote service.

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SERVOGrid Application Descriptions

• Codes range from simple rough estimate codes to
  parallel, high performance applications.
• Disloc handles multiple arbitrarily dipping
  dislocations (faults) in an elastic half-space.
• Simplex inverts surface geodetic displacements
  for fault parameters using simulated annealing
  downhill residual minimization.
• GeoFEST Three-dimensional viscoelastic finite
  element model for calculating nodal displacements
  and tractions. Allows for realistic fault
  geometry and characteristics, material
  properties, and body forces.
• Virtual California Program to simulate
  interactions between vertical strike-slip faults
  using an elastic layer over a viscoelastic
  half-space
• RDAHMM Time series analysis program based on
  Hidden Markov Modeling. Produces feature vectors
  and probabilities for transitioning from one
  class to another.
• PARK Boundary element program to calculate fault
  slip velocity history based on fault frictional
  properties.a model for unstable slip on a single
  earthquake fault.
• Preprocessors, mesh generators
• Visualization tools RIVA, GMT

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Web Services

• Web services are the fundamental pieces of
  distributed Service Oriented Architectures.
• We should define lots of useful services that are
  remotely available
• Archival data access services supporting queries,
  real time sensor access, and mesh generation all
  seem to be popular choices.
• Web services have two important parts
• Distributed services
• Client applications
• These two pieces are decoupled one can build
  clients to remote services without caring about
  the programming language implementation of the
  remote service.
• Java, C, Python

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Web Services, Continued

• Clients can be built in any number of styles
• We build portal clients ubiquitous, can combine
• One can build fancier GUI client applications.
• You can even embed Web service client stubs
  (library routines) in your application code, so
  that your code can make direct calls to remote
  data sources, etc.
• Regardless of the client one builds, the services
  are the same in all cases
• my portal and your application code may each use
  the same service to talk to the same database.
• So we need to concentrate on services and let
  clients bloom as they may
• Client applications (portals, GUIs, etc.) will
  have a much shorter lifecycle than service
  interface definitions, if we do our job
  correctly.
• Client applications that are locked into
  particular services, use proprietary data formats
  and wire protocols, etc., are at risk.

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iSERVO Web Services

• Job Submission supports remote batch and shell
  invocations
• Used to execute simulation codes (VC suite,
  GeoFEST, etc.), mesh generation (Akira/Apollo)
  and visualization packages (RIVA, GMT).
• File management
• Uploading, downloading, backend crossloading
  (i.e. move files between remote servers)
• Remote copies, renames, etc.
• Job monitoring
• Apache Ant-based remote service orchestration
• For coupling related sequences of remote actions,
  such as RIVA movie generation.
• Database services support SQL queries
• Data services support interactions with
  XML-based fault and surface observation data.
• For simulation generated faults (i.e. from
  Simplex)
• XML data model being adopted for common formats
  with translation services to legacy formats.
• Migrating to Geography Markup Language (GML)
  descriptions.

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SERVO Grid
Solid Earth Research Virtual Observatory using
grid technologies and high-end computers
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Problem Solving Environment
High-level architecture of planned system showing
grids, portals, and grid computing environments.
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GeoFEST Northridge Earthquake Deformation
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Virtual California 1000 Years of Simulated
Earthquakes
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Pattern RecognitionInSAR and Seismicity
Anomalies
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Summary

• Prototype portal and database have been
  developed.
• SERVO is being used to carry out system level
  science with the initial focus being on southern
  California.
• More info http//quakesim.jpl.nasa.gov