Ground-Motion Duration Prediction Model from Recorded Mexican Interplate and Intermediate-Depth Intraslab Earthquakes

2020 ◽  
Author(s):  
Miguel A. Jaimes ◽  
Adrián-David García-Soto
Keyword(s):  
Prediction Model ◽  
Ground Motion ◽  
Predictive Models ◽  
Focal Depth ◽  
Duration Models ◽  
Arias Intensity ◽  
Intermediate Depth ◽  
Fault Surface ◽  
Significant Duration ◽  
Duration Prediction

ABSTRACT Predictive models for ground-motion duration of Mexican subduction interplate and intermediate-depth intraslab earthquakes are presented. The considered sites are rock sites. For the ground-motion duration models, the significant durations for ranges between 5%–75%, 5%–95%, and 2.5%–97.5% of Arias intensity are considered for the analyses. The significant duration predictive models are expressed in terms of magnitude, distance, and focal depth; this last variable is considered only for intraslab earthquakes. A total of 418 and 366 accelerograms obtained from 40 Mexican interplate and 23 intraslab earthquakes, respectively, are used. The applicability of the duration equation for subduction interplate events is restricted to moment magnitudes 5<Mw<8 and distances to the fault surface 17<R<400  km; for intraslab events, it is restricted to 5.2<Mw<8.2, 22<R<400  km, and focal depths 35<HD<75  km. The models are compared against existent models for Mexico and other regions. The analyses and comparisons indicate that using ground-motion duration models accounting for the two types of earthquakes is required and that such models should be developed for specific regions.

Updated ground motion prediction model for Mexican intermediate-depth intraslab earthquakes including V/H ratios

2020 ◽  
Vol 36 (3) ◽  
pp. 1298-1330 ◽  
Author(s):  
Miguel A Jaimes ◽  
Adrián D García-Soto
Keyword(s):  
Ground Motion ◽  
Focal Depth ◽  
Prediction Equation ◽  
Motion Prediction ◽  
Ground Motion Prediction Equation ◽  
Earthquake Hazards ◽  
Ground Motion Prediction ◽  
Ground Motion Parameters ◽  
Intermediate Depth ◽  
Motion Parameters

This article presents an updated ground motion prediction equation for pseudo acceleration values from Mexican intermediate-depth intraslab earthquakes at rock sites (National Earthquake Hazards Reduction Program (NEHRP) class B) for the horizontal and the vertical components. The equations were built as functions of magnitude, distance to the fault surface of the earthquake and focal depth, using 23 event recordings (366 records). The database is extended from a previous one used to develop a ground motion prediction equation for intraslab earthquakes, including 7 more events and over 80 accelerograms recorded from 2005 to 2017. The previous model neither included the ground motion parameters from the two significant normal-faulting events occurred in 2017, nor the computing of V/ H ratios. Differences in the predicted ground motion parameters are found. Therefore, an updated attenuation model for intraslab earthquakes is developed for distances up to around 400 km and Mw from approximately 5 to 8.2. The model includes a depth-scaling term with focal depths restricted up to 75 km.

scholarly journals Simulation of non-stationary stochastic ground motions based on recent Italian earthquakes

2021 ◽  
Author(s):  
Fabio Sabetta ◽  
Antonio Pugliese ◽  
Gabriele Fiorentino ◽  
Giovanni Lanzano ◽  
Lucia Luzi
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Strong Motion ◽  
Stochastic Simulations ◽  
Model Parameters ◽  
Motion Model ◽  
Arias Intensity ◽  
Time Frequency ◽  
Ground Motion Model ◽  
Ground Motion Records

AbstractThis work presents an up-to-date model for the simulation of non-stationary ground motions, including several novelties compared to the original study of Sabetta and Pugliese (Bull Seism Soc Am 86:337–352, 1996). The selection of the input motion in the framework of earthquake engineering has become progressively more important with the growing use of nonlinear dynamic analyses. Regardless of the increasing availability of large strong motion databases, ground motion records are not always available for a given earthquake scenario and site condition, requiring the adoption of simulated time series. Among the different techniques for the generation of ground motion records, we focused on the methods based on stochastic simulations, considering the time- frequency decomposition of the seismic ground motion. We updated the non-stationary stochastic model initially developed in Sabetta and Pugliese (Bull Seism Soc Am 86:337–352, 1996) and later modified by Pousse et al. (Bull Seism Soc Am 96:2103–2117, 2006) and Laurendeau et al. (Nonstationary stochastic simulation of strong ground-motion time histories: application to the Japanese database. 15 WCEE Lisbon, 2012). The model is based on the S-transform that implicitly considers both the amplitude and frequency modulation. The four model parameters required for the simulation are: Arias intensity, significant duration, central frequency, and frequency bandwidth. They were obtained from an empirical ground motion model calibrated using the accelerometric records included in the updated Italian strong-motion database ITACA. The simulated accelerograms show a good match with the ground motion model prediction of several amplitude and frequency measures, such as Arias intensity, peak acceleration, peak velocity, Fourier spectra, and response spectra.

High-frequency ground-motion variability for rough-fault ruptures  

2021 ◽  
Author(s):  
Jagdish Chandra Vyas ◽  
Martin Galis ◽  
Paul Martin Mai
Keyword(s):  
Ground Motion ◽  
Large Scale ◽  
Earthquake Ground Motion ◽  
Small Scale ◽  
Dynamic Rupture ◽  
Roughness Effects ◽  
Ground Shaking ◽  
Fault Surface ◽  
Fault Roughness ◽  
Ground Motion Variability

<p>Geological observations show variations in fault-surface topography not only at large scale (segmentation) but also at small scale (roughness). These geometrical complexities strongly affect the stress distribution and frictional strength of the fault, and therefore control the earthquake rupture process and resulting ground-shaking. Previous studies examined fault-segmentation effects on ground-shaking, but our understanding of fault-roughness effects on seismic wavefield radiation and earthquake ground-motion is still limited.  </p><p>In this study we examine the effects of fault roughness on ground-shaking variability as a function of distance based on 3D dynamic rupture simulations. We consider linear slip-weakening friction, variations of fault-roughness parametrizations, and alternative nucleation positions (unilateral and bilateral ruptures). We use generalized finite difference method to compute synthetic waveforms (max. resolved frequency 5.75 Hz) at numerous surface sites  to carry out statistical analysis.  </p><p>Our simulations reveal that ground-motion variability from unilateral ruptures is almost independent of  distance from the fault, with comparable or higher values than estimates from ground-motion prediction equations (e.g., Boore and Atkinson, 2008; Campbell and Bozornia, 2008). However, ground-motion variability from bilateral ruptures decreases with increasing distance, in contrast to previous studies (e.g., Imtiaz et. al., 2015) who observe an increasing trend with distance. Ground-shaking variability from unilateral ruptures is higher than for bilateral ruptures, a feature due to intricate seismic radiation patterns related to fault roughness and hypocenter location. Moreover, ground-shaking variability for rougher faults is lower than for smoother faults. As fault roughness increases the difference in ground-shaking variabilities between unilateral and bilateral ruptures increases. In summary, our simulations help develop a fundamental understanding of ground-motion variability at high frequencies (~ 6 Hz) due small-scale geometrical fault-surface variations.</p>

Ground Motion Prediction Model for the Peak Inelastic Displacement of Single-Degree-of-Freedom Bilinear Systems

2018 ◽  
Vol 34 (3) ◽  
pp. 1177-1199 ◽  
Author(s):  
Pablo Heresi ◽  
Héctor Dávalos ◽  
Eduardo Miranda
Keyword(s):  
Prediction Model ◽  
Ground Motion ◽  
Degree Of Freedom ◽  
Motion Prediction ◽  
Ground Motion Prediction ◽  
Vibration Period ◽  
Single Degree Of Freedom ◽  
Inelastic Displacement ◽  
Single Degree ◽  
Proposed Model

This paper presents a ground motion prediction model (GMPM) for estimating medians and standard deviations of the random horizontal component of the peak inelastic displacement of 5% damped single-degree-of-freedom (SDOF) systems, with bilinear hysteretic behavior and 3% postelastic stiffness ratio, directly as a function of the earthquake magnitude and the distance to the source. The equations were developed using a mixed effects model, with 1,662 recorded ground motions from 63 seismic events. In the proposed model, the median is computed as a function of the vibration period and the normalized strength of the system, as well as the event magnitude and the Joyner-Boore distance to the source. The standard deviation of the model is computed as a function of the vibration period and the normalized strength of the system. The proposed model has the advantage of not requiring an auxiliary elastic GMPM to predict the median and dispersion of peak inelastic displacement.

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