NGA Ground Motion Database
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1 NGA Ground Motion Database Carola Di Alessandro Post Doctoral PEER UC Berkeley (*) * Currently at GeoPentech, Inc.
2 PURPOSE Update of the PEER Ground Motion Database 2010 Beta Version ( New NGA-West2 Database has been finalized and will be made public in 2013 Collect User s feedback on desirable features Search options in the future interactive web application
3 PEER Ground Motion Database 2010 Beta Version Based on DGML Application Interactive web application based on DGML Ver. 2.0 software package w/ funding from w/ thanks to
4 PEER Ground Motion Database 2010 Beta Version Presented in several occasions PEER & NEES Annual Meeting, San Francisco, October 2010 PEER Annual Meeting, Berkeley, October 2011 GeoEngineering Lecture, May 2012
5 2010 Improvements vs. previous DB versions 2005 PEER NGA Database Used to develop 2008 NGA relations Purge events not associated to shallow crustal earthquakes in active tectonic regimes Remove controversial recordings/stations
6 2010 Improvements vs. previous DB versions 2000 PEER Ground Motion Database First public database Significant increase of recordings number 2005 Data 2000 Data
7 PEER Ground Motion Database 2010 Beta Version Search features Unscaled or Scaled options
8 SEARCH FOR GROUND MOTION RECORDS UNSCALED Records Based on earthquake parameters OR Event name / NGA Sequence or Station Name
9 SEARCH FOR GROUND MOTION RECORDS SCALED Records Applies linear scale factor shape preserved! Needs a TARGET SPECTRUM NGA Model User Defined Spectrum ASCE Code Spectrum
10 EPSILON: PEER NGA TARGET SPECTRUM Number of Standard Deviations CONDITIONAL MEAN: Option to apply the Conditional Mean Method PERIOD of CONDITIONAL MEAN Method: Specifies the period for the Conditional Mean Method Input panel to create PEER-NGA Spectrum
11 EPSILON: PEER NGA TARGET SPECTRUM Number of Standard Deviations away from the median value (e.g. epsilon=1.0 for an 84th-percentile spectrum) 1 st OPTION: Conditional Mean Option NO Generate a constant Epsilon Spectrum Examples of constant epsilon spectra generated using the average of five NGA models and epsilon = 0, 1, and 2 Epsilon=2 Epsilon=0 Epsilon=1 PEER Annual Meeting, Berkeley October 26, 2012
12 2 nd OPTION: Specify the value of Epsilon at a Spectral Period (correlation model by Baker & Jayaram, 2008) PEER - NGA TARGET SPECTRUM Develop a Conditional Mean Spectrum (Baker & Cornell, 2006) Conditional Mean Option YES Epsilon=1 Example of a conditional mean spectrum (CMS) created for an epsilon value of 1.0 anchored at a spectral Period of 0.5 seconds Conditional Mean Spectrum, Epsilon=1, T_eps=0.5 sec Epsilon=0
13 SEARCH ENGINE RECORD ACCEPTANCE CRITERIA: Perform search over NGA Database WEIGHT FUNCTION: Specification of Weight function used for scaling records
14 SEARCH ENGINE RECORD ACCEPTANCE CRITERIA: Seismological parameters Scaling options: SCALING NO Unscaled Matching YES Single Period YES Period (sec) NO Factor Limit
15 SEARCH ENGINE 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) SCALING NO Unscaled Matching YES Single Period NO Factor Limit f = SA SA t arg et record ( T ( T s s ) ) YES Period (sec)
16 SEARCH ENGINE SCALING YES Single Period YES Period (sec) NO NO Unscaled Matching Factor Limit 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 ln f = i w(t i) ln SA i target (T i) SA w(t ) i record (T ) i
17 SEARCH ENGINE RANKING of MATCHING RECORDS : Ranking is a function of weight function ln f = i target (T i) w(t i) ln SA SA w(t ) i i record (T ) i INCREASING BEST MATCHING MATCHING RECORDS INCREASING MSE
18 DEDICATED PAGE: FEEDBACK
19 FEEDBACK UNSCALED Search Consistency with FN / FP Rotation: As recorded FN / FP rotated Apparent loss of records wrt 2005 version
20 FEEDBACK SCALED Search Consistency with Scaling: FN / FP rotated AND scaled FN / FP rotated but NOT scaled As recorded
21 FEEDBACK SCALED Search Ability to select Horizontal Component to perform search Actually, FN/FP components are used in pair (Geom. Mean) New spectral value will be GMRotD50 Increase n. records in search result 30 recordings are displayed due to copyright issues Incorrect naming, orientation inconsistencies
22 FEEDBACK SEARCH Options Peak Spectral Values PGA, PGV, PGD (?) Feature available in former DB versions Arias Intensity Currently D5-95 is an option 2000 Version Site Conditions beside VS,30 NEHRP, Geomatrix 3 rd letter, Superficial Geology, Instrument Housing Data Source
23 PLANNED NEW FEATURES Incorporation of elastic response spectra for 11 damping ratios. Following the work by S. Rezaeian et al. (2012) Other spectral search methods Under debate GMSM workforce
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