Petascale Cyberfacility for Physics-based Seismic Hazard Analysis Research Project
The SCEC Petascale Cyberfacility for Physics-based Seismic Hazard Analysis research Project (PetaSHA-1) (EAR-0623704) was funded by the National Science Foundation (NSF) on October 1, 2006. This NSF-funded research Project performs basic seismic hazard research using high-performance computing technologies. The PetaSHA-1 Project seeks to advance seismic hazard research through the use of Petascale computing facilities as they become available to the NSF research community.
The PetaSHA-1 Project science objectives are formulated in terms of three science thrusts:
- Extend deterministic simulations of strong ground motions to 3 Hz for investigating the upper frequency limit of deterministic ground-motion prediction.
- Improve the resolution of dynamic rupture simulations by an order of magnitude for investigating the effects of realistic friction laws, geologic heterogeneity, and near-fault stress states on seismic radiation.
- Compute physics-based PSHA maps and validate those using seismic and paleo-seismic data.
We have translated these science objectives into specific activities that can be accomplished over the next few year. Based on discussions at the SCEC annual meeting and with the PI, co-PI’s, and SCEC scientists, we have identified the following simulation projects as the primary simulations drivers for the PetaSHA Project.
- Develop a dynamic rupture platform (DynaShake) that can generate kinematic rupture parameters (source descriptions) that closely emulate dynamically-consistent rupture behaviors. Use DynaShake to develop kinematic rupture models for several observed earthquakes (validation) and several large SAF ruptures (1690, 1812, 1857, Cholame-Bombay Beach (wall-to-wall)).
- Use a DynaShake-developed source description for a wall-to-wall rupture in 800x400x100km volume at 1 Hz (with 10 Hz stochastic) using 2 different AWM codes. (PetaSHA Milestone: M3)
- Calculate 1000 CyberShake Hazard curves at 0.5 Hz frequency to develop a low-resolution hazard map for Los Angeles using WGCEP-2002 ERF. (PetaSHA Milestone: M4)
- Use DynaShake to develop kinematic source parameters for a large reverse faulting earthquake such as a M6.9 on the Cucamonga/Sierra Madre fault system and perform a wave propagation simulation with topography. (PetaSHA Milestone: M2)