Are Fling Effects Captured in NGA Models
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Ronnie Kamai [email protected] SWUS SSHAC WS#1, March 20 th , 2013 Are Fling Effects Captured in NGA Models ?
Transcript of Are Fling Effects Captured in NGA Models
Ronnie Kamai
SWUS SSHAC WS#1, March 20th, 2013
Are Fling Effects Captured in NGA Models ?
Data to constrain GMPEs in Critical Ranges
What is fling?
Describe the dataset of records with both static displacement and standard processing in the NGA-West2 Database.
Describe the currently available finite fault simulation dataset for fling effects.
Show the effect of standard processing on the response spectra for records with fling.
What is Fling?
What is Fling?
Are Fling Effects Captured in NGA Models ?
Why not?
Centering Sampling of events
Sampling of stations/distances
Processing The NGA database contains records that were
processed to remove noise
High-pass Butterworth filter – remove long periods
Baseline correction – forcing zero Acc, Vel, Disp at end of time-history
Empirical Data
Geodetic (Dsite) S.F (1906)
Imperial Valley (1940)
Landers (1992)
Kocaeli (1999)
Static Processing of Ground Motions (Dsite & Tfling)
Landers (1992) M7.28
Kocaeli (1999) M7.51
Chi Chi (1999) M7.62
Duzce (1999) M7.14
Denali (2002) M7.9
Wenchuan (2008) M7.9
L-Aquila (2009) M6.3
Darfield (2010) M7.0
% from NGA2, M>=7:
o 73% at Rrup <=10 km
o 55% at Rrup <=20 km
o 40% at Rrup <=30 km
Permanent Displacement Database (PE&A)
Finite Fault Simulations
Using SCEC Broadband platform
Using Graves&Pitarka2010
Reverse, Strike-Slip
Mag 6.0-8.2
Dip 20-90
ZTOR = 0-5 km
Station Distance 1.0-100 km
30 realizations of slip for
each event
Effects of Signal Processing on RotD050 Response Spectra
• Process all simulation recordings
• Compute RotD050 for each
• Get Ratio unprocessed/processed
• Find Magnitude, Distance, Period dependence of ratio
• Similar process performed with the PEA-Permanent Displacement Database, also compared with RotD050 from NGA FlatFile (called ‘Dynamic’).
Distribution of High-pass filter corner freq. for NGA-West2
Example - Simulations
Example1 - PEA Permanent Displacement
Example2 - PEA Permanent Displacement
References
Graves R. W. and Pitarka A., 2010. “Broadband Ground-Motion Simulation Using a Hybrid Approach”, Bulletin of the Seismological Society of America, Vol 100 (5a).
Greagor N., Silva W. and Darragh R., 2002. “Development of Attenuation Relations for Peak Particla Velocity and Displacement”. Report submitted to PG&E, CEC, Caltrans and available online at http://www.pacificengineering.org/rpts_page1.shtml.
