Transcript SCEC Broadband Platform Workshop Introduction to the SCEC Broadband Platform 2G (Second Generation) Philip Maechling ([email protected]) Scott Callaghan ([email protected]) 19 May 2010

SCEC Broadband Platform Workshop
Introduction to the SCEC Broadband Platform 2G
(Second Generation)
Philip Maechling ([email protected])
Scott Callaghan ([email protected])
19 May 2010
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Proposed Workshop Agenda
10:30am - Introductions (Somerville)
10:45am - Overview of Broadband Platform Capabilities Discussion (Maechling)
11:00am - Run Northridge Validation (All)
11:30am - Run User Specified scenario Event (All)
12:00pm - Lunch Break (All)
1:00pm - Broadband Platform Science Background Discussion (Somerville)
1:30pm – User Specified Platform Simulations (All)
2:30pm - Summary/Feedback/Next Steps (Somerville/Maechling)
3:00pm - Adjourn
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Broadband Platform 2G Goals
The SCEC Broadband platform has been updated with
new versions of what we will call the SDSU, UCSB,
and URS codes (additional organizations were
involved in development of the codes).
– Rupture generator
– Low frequency
– High frequency
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Broadband Platform 2G Goals
New processing stages and validation capabilities have
been added to the platform
– Site response
– Goodness of Fit Comparisons
– Automated plotting of SRF, seismograms, GOF
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Broadband Platform 2G SRF Plots
Platform can generate
rupture models in SRF
format from user specified
event parameters and now
can plot images of the
SRF models from updated
rupture generators.
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Broadband Platform 2G Seismogram Plots
Platform validation
processing includes
plotting of overlays
between observed strong
motion and synthetic
results.
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Broadband Platform 2G Seismogram Overlay
Platform validation
processing includes
plotting of overlays
between observed strong
motion and synthetic
results.
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Broadband Platform 2G Goals
Goodness of Fit images
compare results involving
more than 3 sites. The plots
show the bias (red line), the
grey region is the 90%
confidence range of the
bias, and the standard
deviation of the bias (shown
by the outer edge of the
green shading).
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Broadband Platform 2G Goals
GOF figure for UCSB Northridge is
attached. These plots use period for
the horizontal axis, so the large
underprediction seen in the SDSU
plots in Phil's PPT are at the shortperiods (high frequency).
Also, it looks like the 90% confidence
interval ("grey" region) is not being
plotted. It may be that this option is
not being used in the plotting script.
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URS Loma Prieta & Northridge
URS Landers & Imperial Valley
SDSU Northridge 24 Near Fault Sites
SDSU Northridge 34 Near Fault Sites
SDSU Northridge All 133 Sites
Broadband Platform 2G Observed Data
•
•
•
•
The observed motions are strong motion recordings downloaded from the
PEER NGA Database (peer.berkeley.org/nga) and the Center for Engineering
Strong Motion Data (www.strongmotioncenter.org). Most records come from
PEER.
All these data have been baseline corrected and filtered by the distributing
organization (e.g. PEER/NGA).
The usable bandwidth for each record is listed in the station file that
accompanied the data.
The data are ground acceleration in units of cm/s/s and the file format is BBP.
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Broadband Platform 2G Goals
The Broadband Platform integrates two types scientific processing software
together which we distinguish as:
Programs – Single version of these programs are used in platform:
– Peak Spectral Response Software
Peak
Amps
– Goodness of Fit Software
Modules – Multiple versions of these modules are used in platform:
– Rupture generator
– Low frequency
Site
– High frequency
Response
– Site response
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Broadband Platform 2G Goals
SCEC Broadband Platform 2G Capabilities:
Use Case 1:
– User selects one of three validation event and the platform
calculates broadband seismograms for the event and
compares platform seismograms to observed data.
Use Case 2:
- User defines parameters for a California earthquake,
selects modules to use, and calculates broadband
seismograms for the event.
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Broadband Platform 2G Goals
Use Case 1:
– User can use the platform to calculate broadband
seismograms for Landers, Loma Prieta, and Northridge
events.
– Platform will automatically compare synthetic broadband
seismograms, compute peak amplitudes from
seismograms, and compare synthetics to observations.
– User can view synthetics, observed, and goodness of fit
plots for each comparison.
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Broadband Platform Validation Processing:
Greens
Function
Station
Lists
Observed
Strong Motion
Data
SRFs
Low
Freq
Seismog
rams
High
Freq
Seismog
rams
Site
Response
Seismog
rams
Peak
Amps
Peak
Amps
GOF
Goodness
of Fit
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Broadband Platform Validation Processing:
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Broadband Platform 2G Goals
Use Case 2:
- User specifies earthquake parameters and ground motion
recording sites and platform calculates broadband
seismograms at user specified sites.
- Platform will use rupture generators (in SRF format) to
produce slip time histories for user specified events.
- Platform produce seismograms, peak amplitude
summaries, and images of Rupture and waveforms.
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Broadband Platform User Specified Event Processing:
Greens
Function
Station
List
Seismog
rams
Source
Params
Rupture
Generator
SRF
Low
Freq
Seismog
rams
High
Freq
Seismog
rams
Site
Response
Seismog
rams
Peak
Amps
Peak
Amps
GOF
Goodness
of Fit
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Broadband 2G - Ground Motion Simulation Platform – V2
Source Description
• CFM, ERF
• Mw, Dimension,
Geometry
•…
• GF Libraries
• Site Lists
Broadband
Time Histories
(0 – 10 Hz) w/
Site Response
Processing
Broadband
Time Histories
(0 – 10 Hz)
(1) Kinematic
Rupture
Generator
(4) Site
Response
(2) Low
Frequency
Simulation
(< 1 Hz)
(5) Peak
Amp
Calculation
(6) Goodness
Of Fit
Calculation
Combine Low &
High Frequency
Library of
Ruptures in
Standard Rupture
Format
(3) High
Frequency
Simulation (> 1
Hz)
1. Filters
2. Time Shift
Peak Amp
Summary
GOF
Summary
Peak Amp
Summary
Broadband Platform User Specified Event Processing:
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Changes to Platform from 1G
• Validation tests
– Platform can run user-requested validation tests against
observed data
• Greens function files storage externally with integrity
checking on files
– MD5 sum tests on GFs enables user to check for data
corruption prior to platform use
• User interface menu-system updated to support
many additional platform options.
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Broadband Platform 2G Software Features
• User can check software out of version control system.
• User can build software on properly configured Linux
computer.
• User can run Unit Tests to verify platform software has
compiled and built successfully
• User will be able to run Acceptance Tests to verify platform
successfully recalculated validation results.
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User Accessible Software Testing
• Unit tests
– Unit verification tests for platform code components
– Unit Test suite expanded as new program and modules are
integrated into platform
• Acceptance tests
– End-to-end tests of each workflow
– Intended for users when code is built and checked out
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Broadband Platform 2G Software Features
• SCEC Web site updated with Broadband Platform web pages
at: http://scec.usc.edu/research/cme/groups/broadband
• Updated Broadband Platform Installation Manual available on
CME web site.
• User can report and track status of problems through issue
tracking systems: https://intensity.usc.edu/trac/broadband
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Example Platform Usage
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