SYNTHESIS 0.1: what future?wpage.unina.it/sergio.delgaudio/presentazioni/Pacor_ingv.pdfground motion...
Transcript of SYNTHESIS 0.1: what future?wpage.unina.it/sergio.delgaudio/presentazioni/Pacor_ingv.pdfground motion...
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SYNTHESIS 0.1: what future?
Napoli 27 Marzo 2014
Pacor F., D’Amico M., Luzi L., Puglia R., Russo E., Gallovic F.
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GOALS
• To archive and to distribute through the WEB synthetic waveforms
• To promote the use of synthetic seismograms as integration to
the observed ground motion
• To furnish an usable tool for – Scientific purpose
» Analysis of Ground Motion variability » Integration Ground Motion Prediction Equation
– Seismic risk mitigation » Damage scenarios » Microzonation
– Engineering application » Seismic input definition for the structural design
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WHAT IS SYNTHESIS? …. a synthetic waveforms repository
http://synthesis.mi.ingv.it/
Synthetic database ensures a) Trasparency b) Repeatibility c) Data availability
Progetto Reluis (20010-2012), Progetto INGV-DPC S3 (2005 – 2007)
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WHAT IS SYNTHESIS? ….a relational database management system (Mysql®)
SCENARIOS
SYNTHETIC WAVEFORMS
STATIONS
Using the structure of ITACA!
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HOW IT WORKS? ….. the database structure
http://dyna.mi.ingv.it/synthesis/
References
Scenarios
Synthetics Waveforms
Stations
13
11
10
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EXPLORING SYNTHESIS scenarios search
Search Criteria
Link to scenario details
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EXPLORING SYNTHESIS scenarios details
Waveform detail Ground Motion Parameters Link to Stations
Link to waveforms
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EXPLORING SYNTHESIS station search
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EXPLORING SINTESIS synthetics waveforms search
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EXPLORING SINTESIS synthetics waveforms search
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EXPLORING SYNTHESIS scenario gallery
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DATABASE POPULATION
IRPINIA FAULT Some numbers 3 simulation techniques: HIC, EXSIM, DSM We include 54 scenarios for each technique 6 nucleation points x 3 rupture velocities x 3slip
distributions 144 virtual observers
24084 waveforms!!!!!
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NEW STRATEGY
• Selection of synthetic waveforms based on specific features of the ground motion parameters
Freq
(a)
mean
a
maximum
a
compatible with a predictive equation
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COSENZAEXAMPLE
Length
(km)
Width (km) Average displacement
(m)
M7 37 26 1.4
M6 13 9 0.4
M5 4 2.7 0.13
• Cosenza case study:
Three seismic sources were simulated, able to generate events of magnitude M equal to 5.0, 6.0, e 7.0
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2 2.4 2.8 3.20
10
20
30
40
50
M12 2.4 2.8 3.2
0
10
20
30
40
50
M3
2 2.4 2.8 3.20
0.5
1
1.5
2
2.5
G2
2 2.4 2.8 3.20
10
20
30
40
50
M5
M #Nucleation
Point
#rupture
velocity
#k #stress
drop
#modeled
fault
#simulation
7.0 27 3 3 1 1 243
6.0 9 3 3 1 5 405
5.0 1 1 3 4 13 156
1.2 1.6 2 2.4 2.80
4
8
12
16
20
M11.2 1.6 2 2.4 2.8
0
10
20
30
40
M2
1.2 1.6 2 2.4 2.80
0.4
0.8
1.2
1.6
G2
1.2 1.6 2 2.4 2.80
10
20
30
40
M5
M 7 R 0km M 6 R 4km 1.6 2 2.4 2.8 3.2
0
10
20
30
40
M11.6 2 2.4 2.8 3.2
0
10
20
30
40
50
M3
1.6 2 2.4 2.8 3.20
0.4
0.8
1.2
1.6
G2
1.6 2 2.4 2.8 3.20
20
40
60
80
M5
M 6 R 0km
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50° percentile PGA
ID_source 7030 (M7.0)
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Massimo Valore PSA 1 Hz
ID_source 6030 (M6.0)
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Cosenza scenarios
1 simulation technique: DSM
We simulate 648 scenarios (M 7 and M6), but we include
55 waveforms!!!!!
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Proposal
For each scenarios-park
• To establish selection criteria to include synthetic seismograms based on the statistical distribution of the ground motion parameters (i.e. mean, median, percentiles, etc.); Max 5 – 10 synthetics for each observer;
• To populate the database with strong motion parameters for all scenarios
• To reduce the number of virtual observers
• To provide all synthetic dataset on demand
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Generator of slip rates
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Gallovič & Brokešová, 2007
Source model
Basic idea
• The earthquake source is coherent at low frequencies (short
wavelengths), while incoherent at high frequencies (long wavelengths)
Such a coherent model would overpredict the high-frequency directivity effect!
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Subsource distribution
and slip
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Moment rate a source spectrum
L0 = 0.2L
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Examples of slip rates
L0 = 0.2L
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Seismograms and spectra
L0 = 0.2L
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Seismograms and spectra
L0 = 0.05L
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Drawbacks of the present version
• Constant rupture velocity over the fault
• Does not estimate/correct stress drop
• Rupture on small-scale subsources starts from the middle (not from a random point)
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References
• Bernard, P., Herrero, A., 1994. Slip heterogeneity, body-wave spectra, and directivity of earthquake ruptures. Ann. Geofis. XXXVII, 1679–1690.
• Bernard, P., Herrero, A., Berge, C., 1996. Modeling directivity of heterogeneous earthquake ruptures. Bull. Seism. Soc. Am. 86, 1149–1160.
• Gallovič, F., Burjánek, J. (2007). High-frequency Directivity in Strong Ground Motion Modeling Methods, Annals of Geophysics, Vol. 50, N. 2, 203-211.
• Gallovič, F., Brokešová, J. (2007). Hybrid k-squared Source Model for Strong Ground Motion Simulations: Introduction, Phys. Earth Planet. Interiors, 160, 34-50.
• Gallovič, F., Brokešová, J. (2004). On strong ground motion synthesis with k^-2 slip distributions, J. Seismology, 8, 211-224.
• Herrero, A., Bernard, P., 1994. A kinematic self-similar rupture process for earthquakes. Bull. Seism. Soc. Am. 84, 1216–1228.
• Ruiz, J. A., D. Baumont, P. Bernard, and C. Berge-Thierry (2011). Modeling directivity of strong ground motion with a fractal, k-2, kinematic source model, Geophys. J. Int. 186, 226–244.