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SCEC Broadband Platform

Development Using USC HPCC

Philip Maechling (maechlin@usc.edu)

12 Nov 2012

Presentation Topics

1.Studying Earthquakes In California2.Using Computer Simulations to Study Earthquakes3.Establishing the Value of Seismic Forecasts4.SCEC Broadband Platform Development

Southern California in 1857

The most recent ‘big one’ in southern California

Southern California in 2012

• Over 23 million people

• Fastest growing areas are close to the San Andreas

SCEC: An NSF + USGS Research Center

M8 Science ImpactFor the purposes of this Act, an active fault is defined by the

State Mining and Geology Board as one which has “had surface displacement within Holocene time (about the last 11,000 years)” (see Appendix B, Section 3601).

SCEC: An NSF + USGS Research Center

M8 Science ImpactFor the purposes of this Act, an active fault is defined by the

State Mining and Geology Board as one which has “had surface displacement within Holocene time (about the last 11,000 years)” (see Appendix B, Section 3601).

SCEC: An NSF + USGS Research Center

M8 Science ImpactAlquist-Priolo Earthquake Fault-Zoning Act

Rupture Hazard Zones near Long Beach, CA.

SCEC: An NSF + USGS Research Center

M8 Science Impact Fault-Rupture Hazard Zones near Long Beach, CA.

SCEC: An NSF + USGS Research Center

M8 Science Impact Fault-Rupture Hazard Zones near Long Beach, CA.

SCEC: An NSF + USGS Research Center

M8 Science Impact Fault-Rupture Hazard Zones near Long Beach, CA.

SCEC: An NSF + USGS Research Center

M8 Science Impact Fault-Rupture Hazard Zones near Long Beach, CA.

I-405 and Long Beach

Airport

Signal Hill Town Center

Shopping Center

Long Beach City College

Signal Hill Oil Storage Facility

Community Hospital

of Long Beach

Long Beach State University

Stadium

Presentation Topics

1.Studying Earthquakes In California2.Using Computer Simulations to Study Earthquakes3.Establishing the Value of Seismic Forecasts4.SCEC Broadband Platform Development

Characteristics of Scientific Simulations

The reasons seismologists and earthquake engineers want to make better use of simulations are shared with other domains.

Types of Seismic Hazard Forecasts with Commercial or Governmental Market

SCEC research is improving each forecast type.

Seismic Hazard Forecast Types Forecast Users

Earthquake Early Warning Forecast Public, Press, City, State, National Governments

Scenario Earthquake Seismograms Forecasts

Engineering Companies, Insurance Companies, State, National Governments

Short-term earthquake Forecasts Public, Press, State and National Governments

Long-term Probabilistic Seismic Hazard Forecasts

Engineering Companies, Building Code Developers, Insurance companies,State and National Governments,

Presentation Topics

1.Studying Earthquakes In California2.Using Computer Simulations to Study Earthquakes3.Establishing the Value of Seismic Forecasts4.SCEC Broadband Platform Development

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Example Ground Motion Simulation Objectives

Goal:

Characterize the seismic vulnerability of nuclear power plants in the United States.

Approach:

Use computer simulations to determine how strong ground motions might affect existing structures.

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Topics

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Topics

EERI Seminar on Next Generation Attenuation Models

Introduction

Validation = comparison against observations

vs.

Verification = comparison against theoretical predictions

SCEC has established a Technical Activity Group (TAG) focused on GMSV in order to develop and implement testing/rating methodologies via collaboration between ground motion modelers and engineering users.

“SCEC Technical Activity Group on Ground Motion Simulation Validation,” N. Luco, USGS March 7, 2012

Southern California Earthquake Center (SCEC) Broadband Platform Meeting

EERI Seminar on Next Generation Attenuation Models

Initial Recommendations

“SCEC Technical Activity Group on Ground Motion Simulation Validation,” N. Luco, USGS March 7, 2012

Southern California Earthquake Center (SCEC) Broadband Platform Meeting

(2)

(1) (4) (3)Vs

InputRock Att.

G/GMax

D

Output

(From C. Goulet)(From F. Zareian)

Presentation Topics

1.Studying Earthquakes In California2.Using Computer Simulations to Study Earthquakes3.Establishing the Value of Seismic Forecasts4.SCEC Broadband Platform Development

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Broadband Platform Usage Modes

SCEC Broadband Platform Capabilities:

Use Case 1: Calculate Historical Seismograms– User selects a validation event and the platform calculates

broadband synthetic seismograms at selected locations and compares synthetic seismograms to observed data.

Use Case 2: Calculate Scenario Seismograms- User defines parameters for a scenario earthquake, selects

modules to use, and calculates broadband seismograms for the event.

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Broadband Platform Development History

2006 – Scripted and Pegasus Version Developed

2008 – Python Version Developed (First Hanging Wall Problem)

2010 – First Supported Software Release of Platform

2011 – Current Version Released (v11.2.2) (Second Hanging Wall Problem)

2012 – Planning next Broadband Platform version

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Broadband Platform Development Support

• PGE and SCE funding for 2012-2013– Improve scalability by prepare code to run on Cluster– Add new validation event data sets– Add new validation processing and GOF– Run large scale simulations– Add new modules

• SCEC NSF-SI2 project funding of ~2.5M over three years.– Prepare open-source scientific software distribution– Use modern software engineering development techniques– Add new modules– Increase scalability of scientific software

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Broadband Platform Users

• UCI• ETH• Stanford• PEER• UCB• University of Pavia• URS• Model Developer groups UCSB, SDSU, USGS

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Broadband Platform Overview

Broadband Platform Software Distributions:Source Codes and Input Config Files : 2G (increases as platform runs) Data Files (Greens Functions) : 11G (static input files)

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Increase Scale of Broadband Platform

We have developed a new version of SCEC Broadband platform configured to run on SCEC server and on USC Cluster, so that it is capable of running large ensembles of simulations.

Rupture Generation (optional)

• Converts user-provided simple earthquake description into SRF (extended rupture description) file

• Two implementations• Optional module (can supply SRF)

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MAGNITUDE = 6.67FAULT_LENGTH = 20.01DLEN = 0.2FAULT_WIDTH = 25.01DWID = 0.2DEPTH_TO_TOP = 5.0STRIKE = 122RAKE = 90DIP = 40LAT_TOP_CENTER = 34.344LON_TOP_CENTER = -118.515HYPO_ALONG_STK = 6.0HYPO_DOWN_DIP = 19.4DT = 0.01SEED = 3092096

Source Description Rupture with slip

Data Products

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SRF PlotsVelocity and acceleration

seismograms

Station and fault trace maps

Comparison Data Products

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Spectral response

comparison Seismogram comparison

Goodness-of-fit

Evaluation Criteria• Qualitative evaluation of velocity time series and Husid plot

based on Arias intensity

Spectral Acceleration Goodness of Fit

Ri = ln(Oi /Si)

Bias = (1/N) Ri

= [(1/N) (Ri – Bias)2]1/2

Supported Broadband PlatformSoftware Release

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Questions?

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