A multi-modal analytical non-stationary spectral model for characterization and stochastic simulation of earthquake ground motions

2016 ◽  
Vol 80 ◽  
pp. 177-191 ◽  
Author(s):  
Christos Vlachos ◽  
Konstantinos G. Papakonstantinou ◽  
George Deodatis
Keyword(s):  
Stochastic Simulation ◽  
Ground Motions ◽  
Spectral Model ◽  
Earthquake Ground Motions

Stochastic Simulation of Ground Motions of the Wenchuan Earthquake Using Slip-Based Corner Frequency and Scaling Factor

2012 ◽  
Vol 256-259 ◽  
pp. 2127-2135 ◽  
Author(s):  
Xiao Dan Sun ◽  
Xia Xin Tao ◽  
Cheng Qing Liu
Keyword(s):  
Wenchuan Earthquake ◽  
Stochastic Simulation ◽  
Seismic Moment ◽  
Ground Motions ◽  
Spectral Ratio ◽  
Response Spectra ◽  
Scaling Factor ◽  
Spectral Model ◽  
Corner Frequency ◽  
Radiated Energy

Ground motions of the great Wenchuan earthquake were simulated using stochastic simulation technique with an improved source spectral model. In the model, the corner frequency for each subfault is determined based on a basic value calculated from the total seismic moment of the entire fault and an increment depending on the seismic moment assigned to the subfault. The model also includes a slip-based scaling factor accounts for the difference of the radiated energy from each subfault. The simulated ground motions were compared to those from using the source spectral model with dynamic corner frequency in terms of the mean spectral ratio over the 52 stations amd to the observation in terms of 5% damped response spectra. Based on the comparison, the effects of the slip-based corner frequency and the scaling factor on the simulation were discussed.

Directivity in NGA Earthquake Ground Motions: Analysis Using Isochrone Theory

2008 ◽  
Vol 24 (1) ◽  
pp. 279-298 ◽  
Author(s):  
Paul Spudich ◽  
Brian S. J. Chiou
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Strike Slip ◽  
Motion Prediction ◽  
Spectral Acceleration ◽  
Correction Factors ◽  
Ground Motion Prediction ◽  
Earthquake Ground Motions

We present correction factors that may be applied to the ground motion prediction relations of Abrahamson and Silva, Boore and Atkinson, Campbell and Bozorgnia, and Chiou and Youngs (all in this volume) to model the azimuthally varying distribution of the GMRotI50 component of ground motion (commonly called “directivity”) around earthquakes. Our correction factors may be used for planar or nonplanar faults having any dip or slip rake (faulting mechanism). Our correction factors predict directivity-induced variations of spectral acceleration that are roughly half of the strike-slip variations predicted by Somerville et. al. (1997), and use of our factors reduces record-to-record sigma by about 2–20% at 5 sec or greater period.

Simulating and analyzing artificial nonstationary earthquake ground motions

1982 ◽  
Vol 72 (2) ◽  
pp. 615-636
Author(s):  
Robert F. Nau ◽  
Robert M. Oliver ◽  
Karl S. Pister
Keyword(s):  
Difference Equations ◽  
Kalman Filters ◽  
Ground Motions ◽  
Structural Response ◽  
Model Parameters ◽  
Time Varying ◽  
Nonparametric Method ◽  
Linear Difference Equations ◽  
Earthquake Ground Motions ◽  
Earthquake Accelerograms

Abstract This paper describes models used to simulate earthquake accelerograms and analyses of these artificial accelerogram records for use in structural response studies. The artificial accelerogram records are generated by a class of linear linear difference equations which have been previously identified as suitable for describing ground motions. The major contributions of the paper are the use of Kalman filters for estimating time-varying model parameters, and the development of an effective nonparametric method for estimating the variance envelopes of the accelerogram records.

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