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Web-Based PEER Ground Motion Database. Camila Coria Research Assistant PEER – UC Berkeley. Carola Di Alessandro Post–Doctoral Fellow PEER – UC Berkeley. PEER & NEES Annual Meeting, San Francisco. October 8, 2010. INTRODUCTION. Based on DGML Application - PowerPoint PPT Presentation
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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
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
SEARCH FORSEARCH FORGROUND MOTION RECORDSGROUND MOTION RECORDS
UNSCALED Records Based on earthquake parameters OR
PEER & NEES Annual Meeting, San Francisco October 8, 2010
Event name / NGA Sequence or Station Name
SEARCH FORSEARCH FORGROUND MOTION RECORDSGROUND MOTION RECORDS
SCALED Records
Need a TARGET SPECTRUM NGA Model User Defined Spectrum ASCE Code Spectrum
PEER & NEES Annual Meeting, San Francisco October 8, 2010
PEER – NGAPEER – NGATARGET SPECTRUMTARGET SPECTRUM
EPSILON: Number of Standard Deviations
PEER & NEES Annual Meeting, San Francisco October 8, 2010
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
PEER – NGAPEER – NGATARGET SPECTRUMTARGET SPECTRUM
PEER & NEES Annual Meeting, San Francisco October 8, 2010
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
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
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
RECORD ACCEPTANCECRITERIA: Perform search over NGA
Database
WEIGHT FUNCTION: Specification of Weight
Function used for scaling
records
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
RECORD ACCEPTANCECRITERIA:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
Scaling options:
Seismological parameters
Unscaled MatchingUnscaled Matching
SingleSinglePeriodPeriod
NO
NO
YES
YES
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
SCALING OPTIONS:
SCALINGSCALING
Period (sec)Period (sec)
Factor LimitFactor Limit
UnscaledUnscaledMatchingMatching
SingleSinglePeriodPeriod
NO
NO
YES
YES
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
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
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
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
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
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
SEARCH ENGINESEARCH ENGINE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
RANKING of MATCHING RECORDS :
Ranking is a function of weight function
MATCHINGMATCHINGRECORDSRECORDS
INCREASINGMSE
INCREASINGBEST MATCHING
PEER GROUND MOTION DATABASEPEER GROUND MOTION DATABASE
PEER & NEES Annual Meeting, San Francisco October 8, 2010
Additional videos will be soon posted
INFORMATIONINFORMATION
Link:
http://peer2.berkeley.edu/peer_ground_motion_database
E-mail:
PEER & NEES Annual Meeting, San Francisco October 8, 2010
