SCEC Community Modeling Environment (SCEC/CME): SCEC TeraShake Platform: Dynamic Rupture and Wave Propagation Simulations Seismological Society of America Meeting 18 April 2006

SCEC/CME Project Goal: To develop a cyberinfrastructure that can support system-level earthquake science – the SCEC Community Modeling Environment (CME) Support: 5-yr project funded by the NSF/ITR program under the CISE and Geosciences Directorates Oct 1, 2001 – Sept 30, 2006 SCEC/ITR Project NSF CISE GEO SCEC Institutions IRIS USGSISI SDSC Information Science Earth Science

SCEC/CME – All Hands Meeting

SCEC/CME Focus On Seismic Hazard Analysis SCEC/CME System aims to extend and enhance geosciences work already performed in the area of seismic hazard analysis. Metadata for Map: IMT: Peak Acceleration POE: 10% TimeSpan: 50 Years IMR: 1) Boore, Joyner, and Fumal (BJF; 1993, 1994a) with later modifications to differentiate thrust and strike-slip faulting (Boore et al., 1994b), 2) Sadigh et al. (1993) and 3) Campbell and Bozorgnia (1994). ERF: … (and more)

SCEC/CME Computational Pathways Intensity Measures Earthquake Forecast Model Attenuation Relationship 1 Pathway 1: Standard Seismic Hazard Analysis AWM Ground Motions SRM Unified Structural Representation Faults Motions Stresses Anelastic model 2 AWP = Anelastic Wave Propagation SRM = Site Response Model Pathway 2: Ground motion simulation RDMFSM 3 FSM = Fault System Model RDM = Rupture Dynamics Model Pathway 3: Physics-based earthquake forecasting Invert Other Data Geology Geodesy 4 Pathway 4: Ground motion inverse problem

SCEC Computational Platform Concept Definition –A large-scale implementation of computational pathways within a specific computational system (hardware + software + expertise) for producing specific knowledge Implied components –Validated simulation software and geophysical models –Broadly useful simulation capabilities –Imports from other systems. Exports to other Systems –IT/geoscience collaboration involved in operation –Access to High-performance hardware –May use Workflow management tools

Large Scale Simulation-based Seismic Hazard Computational Platform Development 2003 –OpenSHA 2004 –OpenSHA, TeraShake 2005 –OpenSHA, TeraShake, CyberShake 2006 –OpenSHA, TeraShake, CyberShake, Earthworks

TeraShake Platform Anelastic Wave Propagation Capabilities Investigate ground motion effects for several different large Southern San Andreas ruptures.

SCEC/CME TeraShake Simulation area 600 km x 300 km x 80 km dx=200m Mesh of 1.8 Billion cubes sec time step, 20,000 time steps: 3 min Kinematic source: Cajon Creek to Bombay Beach (or back -60 sec source duration -18,886 point sources, each 6,800 time steps in duration

Scenario Earthquake Simulations - TeraShake TeraShake 1.3 Cumulative PGV and SA 3.0 Maps – Kim Olsen et al (AWM), Amit Chourasia et al (Viz)

Scenario Earthquake Simulations - TeraShake TeraShake 1.2 and 1.3 Cumulative PGV – Kim Olsen et al (AWM), Amit Chourasia et al (Viz)

Peak Displacements TeraShake N to S Rupture (left) TeraShake S to N Rupture (right)

Particle Velocities Along N50E Profile Largest Peak Motions above ridge between SG and LA Basins

Causes of ‘Hotspot’ in Los Angeles –Buildup of forward directivity pulse –Excitation of guided waves upon striking S.B. basin –Amplification as sedimentary waveguide narrows between Puente Hills and San Gabriel Mtns. –Lateral and vertical focusing effects from 2D horizontally incident plane waves produce amplification patterns similar to those from TS1.3 and TS1.4 –Additional effects possibly from Airy phase of Love wave –Nonlinear effects likely to decrease peak motions

TeraShake Platform Dynamic Rupture Capabilities Incorporate more physics into the TeraShake simulations by introduction of a dynamic rupture-based source description.

TeraShake-2 Dynamic Simulations RDM run on an inner domain, containing the entire rupture as well as the relevant surrounding environment….So, in addition to rupture physics parameters (yield friction, d 0, etc) Need to include inhomogeneous crust on either side of rupture –This will require validation of rupture simulations Need absorbing boundaries (PML) –To run the rupture to completion, without need for a large inner domain Need validation of code coupling scheme –Current plan is to save the rupture and treat it a kinematic source for AWP –This raises issues of rescaling, smoothing, registering –Need to choose a rupture representation format that AWP can ingest

Large Scale Dynamic Rupture Simulations – Terashake 2

TeraShake 2 Simulation Area Spontaneous Rupture Simulation Domain

Olsen Dynamic Rupture Simulations

Olsen Dynamic Rupture Simulation Movies Slip Animation

TeraShake 1 vs TeraShake 2 PGV Map

Planned Application and Development for TeraShake Platform

TeraShake 3 Simulations for Hz Deterministic Earthquake Ground Motion Prediction Grid points along east, north, and up Grid points (billions) dh (m) f max V s min (m/s) 200 x 200 x x 400 x 500, x 800 x 500, 250, 125 1,333 x 1,333 x 1, , 250, 125

CMU Hercules Tool chain Highly scalable AWM software tools that uses new technique called In-situ parallel mesh generation David O’Hallaron et al (CMU) Etree Mesh Representation Jacobo Bielak et al (CMU) AWM

Finite Element Dynamic Rupture Codes Peak Surface Velocity Ratio (Topography/No Topography)

Scenario Earthquake Simulations – Puente Hills Puente Hills Simulation Scenario Earthquake (10 Hz) Robert Graves (AWM), Amit Chourasia et al (Viz) Velocity Y Component Animation Peak SA 2.0 magnitude Map

Full 3-D Tomography Model (Preliminary) Po Chen – Inversion-based updates to SCEC CVM3.0 Velocity Model.

SCEC Education and Outreach

Outreach To Geosciences, Computer Sciences, and Public SC04 Invited Presentations USC, SDSC Booths AGU 2004 Booth, Presentations, Posters Globus World 2005 Invited Presentation SSA 2005 Booth, Invited Presentations, Posters GRIDS Workshop 2005 Invited Presentation Unavco/IRIS Annual Meeting 2005 CIG Workshop Presentation, Web Services Workshop, Posters SCEC Earthquake Spectrum Press Conference 2005 Earthscope Meeting 2005 Poster, IT Workshop GEON All Hands Meeting 2005 Posters National Forum for Geoscience Information Technology (FGIT) 2005 Poster GSA 2005 Booth, Poster SC05 Invited Presentations USC, SDSC, TeraGrid Booths

Computational Platform Concept Data Intensive Capacity Computing Data Intensive Capability Computing Capability Computing CyberShake Platform PetaShake Platform Observation Platform Seismic Hazard (Application) Large Scale Scenarios (Full Inner/Outer Scales) New Physics-based Simulations (Validation) Community Access (Science Gateways) Validates Applies SCEC Science SCEC Platforms Computing Requirements

Cyberinfrastructure Layering Intelligent services (smart assistants) Integrated system tools (workbench/dashboard) Workflow management Domain applications (webservices/applications) Resource sharing (grids) Hardware (computing, networking, storage) Vertical integration SCEC Community Modeling Environment A grid-enabled collaboratory for system-level earthquake science