QuakeSim

QuakeSim is a NASA project for modeling earthquake fault systems. It was started in 2001 with NASA funding as a follow up to the General Earthquake Models (GEM) initiative. The multi-scale nature of earthquakes requires integrating data types and models to fully simulate and understand the earthquake process. QuakeSim is a computational framework for modeling and understanding earthquake and tectonic processes.

QuakeSim focuses on modeling interseismic process though various boundary element, finite element, and analytical applications, which run on various platforms, including desktop and high-end computers. The QuakeTables database allows for modelers to access geological and geophysical data. A goal of QuakeSim is to develop significant improvements in earthquake forecast quality, thereby mitigating the danger from this natural hazard.

QuakeSim Portal

The QuakeSim Portal allows for users to access and ingest data into models and simulations. It provides the computational infrastructure for the entire project. QuakeSim users can create an account and interact with different data and software through the portal. The QuakeSim Portal consists of portlets that include:

• Facilities for accessing real-time and archival GPS data
• Time series analysis tools, including ST_Filter and RDAHMM
• Mesh generation and viscoelastic finite element simulation tools (GeoFEST)
• Okada-based elastic fault modeling methods (Disloc, which is a forward model, and Simplex for inverting geodetic data).

QuakeTables

QuakeTables is the database used to access information for QuakeSim. Information found in the QuakeTables includes:

• Paleoseismic fault data
• Global Positioning System (GPS) surface deformation data
• Seismicity data
• Processed Interferometric Synthetic Aperture Radar (InSAR) Interferograms from existing satellites

This information plays a big role in the process of forecasting and damage mitigation. The information allows for the creation of simulations and data mining. This then improves the prediction for potential earthquakes. This, along with attenuation modeling and site effects, leads to a better understanding of probable ground motion, allowing for the opportunity to improve structural response.

Figure 1. Process for estimating damage probability.

Developed Software

QuakeSim includes several applications. GeoFEST, PARK, and Virtual California are used to model different aspects of the earthquake cycle. For more information on these programs, and to download them, see the "Download Code" section of the QuakeSim website.

QuakeSim-related NASA missions

QuakeSim utilizes GPS data from NASA, the National Science Foundation, and the US Geological Survey Southern California Integrated GPS Network (SCIGN). QuakeSim is also establishing the computational infrastructure for the planned NASA DESDynI mission.

DESDynI: Deformation, Ecosystem Structure, and Dynamics of Ice

DESDynI (pronounced destiny) is a dedicated US InSAR and LIDAR mission for studying hazards and global environmental change. The objectives of DESDynI are to:

• Determine the likelihood of earthquakes, volcanic eruptions, and landslides
• Predict the response of ice sheets to climate change and impact on sea level
• Characterize the effects of changing climate and land use on species habitats and carbon budget
• Monitor the migration of fluids associated with hydrocarbon production and groundwater resources

Affiliates

• NASA Jet Propulsion Laboratory (lead)
• Brown University
• Indiana University
• NASA Ames
• University of California, Davis
• University of California, Irvine
• University of Southern California

References

• Malik, Tariq (2004-11-03). "Computer model successfully forecasts earthquakes". USA Today. Retrieved 2007-08-14.
• Roach, John (2004-09-17). "Coming Soon: Your Local Earthquake Forecasts?". National Geographic. Retrieved 2007-08-14.
• Donnellan, Andrea; John Rundle; Geoffrey Fox; Dennis McLeod; Lisa Grant; Terry Tullis; Marlon Pierce; Jay Parker; Greg Lyzenga; Robert Granat; Margaret Glasscoe (December 2006). "QuakeSim and the Solid Earth Research Virtual Observatory". Pure and Applied Geophysics. 163 (11–12): 2263–2279. doi:10.1007/s00024-006-0126-y.
• DESDynI: Deformation, Ecosystem Structure, and Dynamics of Ice Monitoring Hazards And Environmental Changes From Space. (2007). [Brochure] Jet Propulsion Laboratory: Author.
• InSAR: Interferometric Synthetic Aperture Radar. (2006). [Brochure] Jet Propulsion Laboratory: Author.

External links

• QuakeTables
• QuakeSim Portal
• QuakeSim.org
• desdyni.org
• The QUAKESIM Fault Database for California, abstract
• Josh Chamot, Earthquake warning tools, Geotimes (American Geological Institute), October 2003, accessed August 16, 2007
• Siegel, H.; Li, P., MSLT, Multi Surface Light Table, a Tool for Viewing Faults Under Their Terrain, American Geophysical Union, Fall Meeting 2003, abstract #S51B-06
• Kristen Cole, Tiny California town is the focus of geologist’s effort to predict quakes, George Street Journal. July 11, 2003, accessed August 16, 2007