Physics-Based 3D Ground Motion Simulations The SCEC/CME High-F and SEISM Projects!
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1 Physics-Based 3D Ground Motion Simulations The SCEC/CME High-F and SEISM Projects! SCEC Site Effects Workshop May 5, 2015 Thomas Jordan Jacobo Bielak Kim Olsen Steven Day Ricardo Taborda! Phil Maechling Yifeng Cui Robert Graves Daniel Roten Zheqiang Shi Po Chen En-Jui Lee Scott Callaghan David Gill Fabio Silva William Savran Kyle Withers Patrick Small Naeem Khoshnevis and more
2 Physics-Based 3D Ground Motion Simulations The SCEC/CME High-F and SEISM Projects! The CME High-F and SEISM projects Background of 3D regional scale simulations Site effects in 3D, velocity models and geotechnical layers Venturing into nonlinear regional soil modeling in 3D Relevant recent advances and future directions
3 The Community Modeling Environment Group A SCEC Special Projects Group! CME group objectives include: Develop structural models of California faults and geology, Develop and validate rupture physics models, Perform large-scale regional wave propagation simulations, Collaborate with engineers studying response to ground motions, and Integrate computational improvements into probabilistic seismic hazard. CME funding (has included but not been limited to): Multi-PI NSF awards: PetaSHA (1, 2, and 3), Outward on the Spiral, SEISM (1 and 2), Geoinformatics (1 and 2); and other single-pi awards. Computational resources (NSF Track I and II, and DOE Incite) (computing time worth $) For details:
4 Physics-Based 3D Ground Motion Simulations! A Trajectory Toward Higher Frequencies and Lower Velocities! TeraShake Hz 500 m/s ShakeOut Simulation and Verification Hz 500 m/s Chino Hills & La Habra Simulation and Validation 2 4 Hz 200 m/s Olsen et al. (2008, 2009)! Bielak et al. (2010)! Olsen and Mayhew (2010)! Taborda and Bielak (2013, 2014)!
5 Evolution into the High-F and SEISM! Building Software to Support Physics-Based Ground Motion Simulations! AWP-ODC Hercules Broadband Platform CyberShake UCVM SEISM-IO
6 3D Regional Simulation Process! Velocity Models, Source Models, Wave Propagation Solver!
7 Seismic Community Velocity Models (CVMs): V P, V S, r From physical crustal models to discrete models for simulation!
8 Validation of Historic Event Simulations! The 2008 Chino Hills earthquake (Vs min = 200 m/s, f max = 4 Hz)! Largest earthquake in the L.A. region since the 1994 Northridge earthquake. No significant damages, no fatalities. Excellent opportunity for testing assumptions and methodologies. Recorded in over 450 strong motion station from different seismic networks. 336 surface stations within simulation domain. Taborda and Bielak (2013, 2014)!
9 Validation: Time Series! The 2008 Chino Hills earthquake (Vs min = 200 m/s, f max = 4 Hz)! Data Synthetics Taborda and Bielak (2013, 2014)!
10 Evidence of Site Effects Relevance! Goodness-of-fit decay in the upper 100 m! Taborda and Bielak (2013, 2014)!
11 Alternative A: Better GTL Profiles! Combination of regional 3D simulation with local 1D propagation! Courtesy of D. Asimaki!
12 Alternative B: Small Scale Heterogeneities! Combination of regional 3D simulation with local 1D propagation! STS Station North-South (dist km)! Olsen (2014)! Savran and Olsen (2014)!
13 Rough Fault Dynamic Rupture Models! Improving the source s geometrical complexity! Shi and Day (2013)!
14 Small Scale Heterogeneities! Representing observed variability in medium properties! Withers et al. (2015)!
15 Evolution into the High-F and SEISM! Building Software to Support Physics-Based Ground Motion Simulations! Withers et al. (2015)!
16 From Linear to Nonlinear Site Effects! Simulations using DP constitutive material model: Euroseistest and Salt Lake City! E-2VP Project point source 200 m/s, 4 Hz Utah GSWG extended source 200 m/s, 1 Hz Taborda et al. (2012)!
17 From Linear to Nonlinear Site Effects! Simulations using DP constitutive material model: Euroseistest and Salt Lake City! Taborda et al. (2012)!
18 From Linear to Nonlinear Site Effects! Simulations using DP constitutive material model: Euroseistest and Salt Lake City! Taborda et al. (2012)!
19 Surface Topography! Without With Topography Restrepo and Bielak (2014)!
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