Difference between revisions of "NWSC ASD"
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Goal: Image Earth’s upper layers by full-3D tomography using two different approaches. The resulting improvements in regional and global models will better characterize the flow within Earth’s mantle, the evolution of plate-tectonic forces, and the potential seismic effects of earthquakes and nuclear explosions. Integrate and validate community computational platforms for developing three-dimensional models of Earth structure. | Goal: Image Earth’s upper layers by full-3D tomography using two different approaches. The resulting improvements in regional and global models will better characterize the flow within Earth’s mantle, the evolution of plate-tectonic forces, and the potential seismic effects of earthquakes and nuclear explosions. Integrate and validate community computational platforms for developing three-dimensional models of Earth structure. | ||
| + | == Summary == | ||
| + | COMMUNITY COMPUTATIONAL PLATFORMS FOR DEVELOPING THREE-DIMENSIONAL MODELS OF EARTH STRUCTURE | ||
| + | Project lead: Thomas Jordan, University of Southern California | ||
| + | Yellowstone allocation: 7.3 million core-hours | ||
| + | |||
| + | Precise information about the structure of the solid Earth comes from seismograms recorded at the surface of a highly heterogeneous lithosphere. Full-3D tomography based on adjoint methods can assimilate this information into three-dimensional models of elastic and anelastic structure. These methods fully account for the physics of wave excitation, propagation, and interaction by numerically solving the inhomogeneous equations of motion for a heterogeneous anelastic solid. Full-3D tomography using adjoint methods requires the execution of complex computational procedures that challenge the most advanced high-performance computing (HPC) systems. In this allocation, we request computational resources to migrate and run two tomographic platforms onto NWSC systems. The two computational systems we propose to port to NWSC include the AWP-ODC 4th-order, staggered-grid, finite-difference code, which has been widely used for regional earthquake simulation and physics-based seismic hazard analysis, and the SPECFEM3D spectral element code, which is capable of modeling wave propagation through aspherical structures of essentially arbitrary complexity on scales ranging from local to global. We will use these tomographic computational tools to refine Community Velocity Models (CVMs) using earthquake waveforms and ambient-noise Green functions, and to investigate the iterative convergence of the tomographic models from disparate starting models. The resulting improved regional and global 3D models will provide better images of mantle convection and its relationship to crustal tectonics and the geodynamo; will more precisely constrain the plate-tectonic processes of lithospheric creation, deformation, magmatism, and destruction; and will improve imaging of seismic sources, including damaging earthquakes and nuclear explosions. | ||
== ASD DEADLINES AND SCHEDULE == | == ASD DEADLINES AND SCHEDULE == | ||
Latest revision as of 22:37, 26 November 2013
SCEC/Princeton has been awarded an Accelerated Scientific Discovery (ASD) allocation from the NCAR Computatioinal and Information Systems Laboratory (CISL) for research on NCAR Wyoming Supercomputer Center (NCSW).
Contents
Allocation Leads
- Project Leads: PI: T. H. Jordan (USC); Co-PIs: P. Chen (U. Wyoming), Y. Cui (SDSC), and J. Tromp (Princeton)
- Project Collaborators: E. Bozdag (Princeton), E.J. Lee (U. Wyoming), P. Maechling (USC), K. Olsen (SDSU), D. Peter (Princeton), J. Shaw (Harvard), C. Tape (U. Alaska)
3D mapping of Earth's upper layers
Goal: Image Earth’s upper layers by full-3D tomography using two different approaches. The resulting improvements in regional and global models will better characterize the flow within Earth’s mantle, the evolution of plate-tectonic forces, and the potential seismic effects of earthquakes and nuclear explosions. Integrate and validate community computational platforms for developing three-dimensional models of Earth structure.
Summary
COMMUNITY COMPUTATIONAL PLATFORMS FOR DEVELOPING THREE-DIMENSIONAL MODELS OF EARTH STRUCTURE Project lead: Thomas Jordan, University of Southern California Yellowstone allocation: 7.3 million core-hours
Precise information about the structure of the solid Earth comes from seismograms recorded at the surface of a highly heterogeneous lithosphere. Full-3D tomography based on adjoint methods can assimilate this information into three-dimensional models of elastic and anelastic structure. These methods fully account for the physics of wave excitation, propagation, and interaction by numerically solving the inhomogeneous equations of motion for a heterogeneous anelastic solid. Full-3D tomography using adjoint methods requires the execution of complex computational procedures that challenge the most advanced high-performance computing (HPC) systems. In this allocation, we request computational resources to migrate and run two tomographic platforms onto NWSC systems. The two computational systems we propose to port to NWSC include the AWP-ODC 4th-order, staggered-grid, finite-difference code, which has been widely used for regional earthquake simulation and physics-based seismic hazard analysis, and the SPECFEM3D spectral element code, which is capable of modeling wave propagation through aspherical structures of essentially arbitrary complexity on scales ranging from local to global. We will use these tomographic computational tools to refine Community Velocity Models (CVMs) using earthquake waveforms and ambient-noise Green functions, and to investigate the iterative convergence of the tomographic models from disparate starting models. The resulting improved regional and global 3D models will provide better images of mantle convection and its relationship to crustal tectonics and the geodynamo; will more precisely constrain the plate-tectonic processes of lithospheric creation, deformation, magmatism, and destruction; and will improve imaging of seismic sources, including damaging earthquakes and nuclear explosions.
ASD DEADLINES AND SCHEDULE
The ASD call for proposals (https://www2.cisl.ucar.edu/docs/allocations/asd) noted several key deadlines for benchmarks and reports. These deadlines are in place to ensure that ASD teams are engaged and ready to take advantage of Yellowstone as soon as it is available. As stated in the call, "If a project is unable to meet these benchmark and production deadlines and guidelines, the ASD allocation will be reduced to 10% of the original allocation, and CISL will reallocate the resources."
-- Preliminary benchmark: June 29, 2012. On Janus or Jellystone (if available).
-- Yellowstone benchmark: July 31, 2012 (or no later than 10 days after Yellowstone acceptance).
-- Primary HPC runs: August 2012 - October 2012. To accommodate all meritorious ASD requests, university ASD projects will be able to complete some of their runs in November 2012. Please note: You will be running alongside the entire Yellowstone community in October and November and should plan your HPC runs accordingly.
-- NWSC GRAND OPENING: October 14-15, 2012. NCAR and the University of Wyoming are planning the NWSC Grand Opening for mid-October. The director of NSF, the governor of Wyoming, and other dignitaries will be in attendance. CISL would like to showcase the early accomplishments of the ASD program at that time. Please work with your designated consultant, visualization expert, and CISL's communications specialist (Marijke Unger) to plan runs, prepare visualizations, and briefly describe your projects in time for this event and the surrounding publicity. (This work will satisfy the preliminary reporting requirement.)
-- Preliminary report: November 5, 2012. You may choose to provide additional details beyond the materials requested for the NWSC Grand Opening.
-- Geyser/Caldera, GLADE access: August 2012 - June 2013. ASD projects will continue to have access to the Geyser and Caldera clusters, as well as their GLADE project spaces for data analysis and visualization through June 30, 2013.
-- FINAL REPORT: July 1, 2013. The final report should be up to five pages describing the research results, the computational experiments performed, the code efficiency, and listing the scientific papers in preparation, submitted, or published as a result of the ASD computations.
-- HPSS access: November 2013. CISL will allow ASD projects to keep data for one year after the end of the ASD period on the HPC system. After that point, projects should plan to make arrangements for there data or discuss other options with CISL.
(Should the Yellowstone installation schedule change significantly, we will notify you of any changes to these deadlines.)
ACKNOWLEDGING CISL AND YELLOWSTONE
ASD projects are required to acknowledge CISL and Yellowstone support for the provision of computational resources in all resulting publications. Please see https://www2.cisl.ucar.edu/docs/acknowledging-ncarcisl.
- Such acknowledgments are a requirement for participation in any future Accelerated Scientific Discovery opportunities. ***
