Web-Based PEER Ground Motion Database
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Transcript of Web-Based PEER Ground Motion Database
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Web-Based PEER Ground Web-Based PEER Ground Motion Database Motion Database
Camila CoriaResearch AssistantPEER – UC Berkeley
PEER & NEES Annual Meeting, San Francisco October 8, 2010
Carola Di AlessandroPost–Doctoral FellowPEER – UC Berkeley
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INTRODUCTIONINTRODUCTION
Based on DGML Application Interactive web application based on DGML
Ver. 2.0 software package
PEER & NEES Annual Meeting, San Francisco October 8, 2010
w/ thanks tow/ funding
from
PEER Ground Motion Database(http://peer2.berkeley.edu/peer_ground_motion_database) Shallow crustal earthquakes in active tectonic
regimes
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SEARCH FORSEARCH FORGROUND MOTION RECORDSGROUND MOTION RECORDS
UNSCALED Records Based on earthquake parameters OR
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Event name / NGA Sequence or Station Name
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SEARCH FORSEARCH FORGROUND MOTION RECORDSGROUND MOTION RECORDS
SCALED Records
Need a TARGET SPECTRUM NGA Model User Defined Spectrum ASCE Code Spectrum
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PEER – NGAPEER – NGATARGET SPECTRUMTARGET SPECTRUM
EPSILON: Number of Standard Deviations
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Input panel to create PEER-NGA Spectrum
CONDITIONAL MEAN: Option to apply the Conditional
Mean Method
PERIOD of CONDITIONAL MEAN Method: Specifies the period for the
Conditional Mean Method
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PEER – NGAPEER – NGATARGET SPECTRUMTARGET SPECTRUM
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Conditional Mean Option “NO”Conditional Mean Option “NO”
EPSILON: Number of Standard Deviations
away from the median value
1st OPTION: Generate a constant Epsilon Spectrum
EpsilonEpsilon=0=0
Epsilon=Epsilon=11
Epsilon=Epsilon=22
(e.g. epsilon=1.0 for an 84th-percentile spectrum)
Examples of constant epsilon spectra generated using theaverage of five NGA modelsand epsilon = 0, 1, and 2
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PEER & NEES Annual Meeting, San Francisco October 8, 2010
Specify the value of Epsilon at a Spectral Period(Baker & Jayaram, 2008)
PEER - NGA PEER - NGA TARGET SPECTRUMTARGET SPECTRUM
Conditional Mean Option “YES”Conditional Mean Option “YES”
EpsilonEpsilon=0=0
EpsilonEpsilon=1 =1
Conditional Mean Spectrum, Epsilon=1, T_eps=0.5 sec
2nd OPTION: Develop a Conditional Mean Spectrum
(Baker & Cornell, 2006)
Example of a conditionalmean spectrum (CMS)created for an epsilon valueof 1.0 at a spectral periodof 0.5 seconds
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SEARCH ENGINESEARCH ENGINE
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RECORD ACCEPTANCECRITERIA: Perform search over NGA
Database
WEIGHT FUNCTION: Specification of Weight
Function used for scaling
records
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SEARCH ENGINESEARCH ENGINE
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RECORD ACCEPTANCECRITERIA:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
Scaling options:
Seismological parameters
Unscaled MatchingUnscaled Matching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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SEARCH ENGINESEARCH ENGINE
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SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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SEARCH ENGINESEARCH ENGINE
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SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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SEARCH ENGINESEARCH ENGINE
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SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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1) Scale the record to match the target spectrum to a single period:
the records are scaled to match the target spectrum at a specific spectral period, called Ts (sec)
)(
)(arg
srecord
sett
TSA
TSAf
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
Unscaled MatchingUnscaled Matching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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SEARCH ENGINESEARCH ENGINE
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2) Scale the record to match the target spectrum over a period range:
the records are scaled by a factor that minimizes the mean squared error (MSE) between the geometric mean spectra of the scaled records horizontal components and the target spectrum
ii
i irecord
itarget
i
)w(T
)(TSA)(TSAln )w(T
fln
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
Unscaled MatchingUnscaled Matching
SingleSinglePeriodPeriod
NO
NO
YES
YES
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WEIGHT FUNCTION W(Ti):
Arbitrary values can emphasize match over narrow period range
i)
iw(T
i )i
(TrecordSA
)i
(TtargetSAln )
iw(T
fln A real number sequence
of periods and weights used to specify the weight function
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SEARCH ENGINESEARCH ENGINE
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RANKING of MATCHING RECORDS :
Ranking is a function of weight function
MATCHINGMATCHINGRECORDSRECORDS
INCREASINGMSE
INCREASINGBEST MATCHING
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PEER GROUND MOTION DATABASEPEER GROUND MOTION DATABASE
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Additional videos will be soon posted
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INFORMATIONINFORMATION
Link:
http://peer2.berkeley.edu/peer_ground_motion_database
E-mail:
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