A5069181389- Seismic Waves and Analysis
- Seismic Performance and Analysis
- Structural Health Monitoring Techniques
- earthquake and tectonic studies
- Geophysics and Sensor Technology
- Geotechnical Engineering and Underground Structures
- Landslides and related hazards
- Earthquake Detection and Analysis
- Emotion and Mood Recognition
- Seismic Imaging and Inversion Techniques
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Face recognition and analysis
- Rock Mechanics and Modeling
- Geophysical Methods and Applications
- Face and Expression Recognition
- Archaeology and Natural History
- Drilling and Well Engineering
BC Hydro (Canada)
2019-2025
Western University
2012-2017
We introduce a new proxy measure for V S 30 (time‐averaged shear‐wave velocity in the upper 30 m) central and eastern North America (CENA). The is site fundamental frequency ( f peak), measured from horizontal‐to‐vertical (H/V) spectral ratios of recorded ground motion (or ambient noise). In this study, H/V are obtained 5% damped pseudospectral acceleration (PSA) seismograph stations CENA using Next Generation Attenuation‐East (NGA‐East) database. correlate values at recording with...
We develop semi-empirical ground motion models (GMMs) for peak acceleration, velocity, and 5%-damped pseudo-spectral accelerations periods from 0.01 to 10 s, the median orientation-independent horizontal component of subduction earthquake motion. The GMMs are applicable interface intraslab earthquakes in Japan, Taiwan, Mexico, Central America, South Alaska, Aleutian Islands, Cascadia. developed using a combination data inspection, regression with respect physics-informed functions,...
Recognizing facial expression in a wild setting has remained challenging task computer vision. The World Wide Web is good source of images which most them are captured uncontrolled conditions. In fact, the Internet Word Wild with expressions. This paper presents results new study on collecting, annotating, and analyzing expressions from web. Three search engines were queried using 1250 emotion related keywords six different languages retrieved mapped by two annotators to basic neutral. Deep...
Research Article| November 14, 2017 Site‐Effects Model for Central and Eastern North America Based on Peak Frequency Average Shear‐Wave Velocity Behzad Hassani; Hassani aDepartment of Earth Sciences, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 5B7, bhassan7@uwo.ca, gmatkinson@aol.com Search other works by this author on: GSW Google Scholar Gail M. Atkinson Author Article Information Publisher: Seismological Society First Online: 14 Nov Online Issn: 1943-3573 Print...
ABSTRACT We update ground‐motion prediction equations (GMPEs) for eastern North America (ENA) using the referenced empirical approach of Atkinson (2008). The technique is based on use residual analysis that models differences between regional observations and a reference GMPE developed data‐rich region. timely because Next Generation Attenuation‐West 2 GMPEs shallow crustal earthquakes in active tectonic regions enable significant improvement implementation this model, relative to previous...
Abstract We develop a regional site‐effects model for central and eastern North America based on an analysis of the residuals observed ground‐motion parameters relative to two prediction equations: one has hard‐rock (site class A) reference site condition, whereas other is referenced B/C boundary condition classification National Earthquake Hazard Reduction Program). In both cases, are well described by fundamental frequency f peak , in which as determined from horizontal‐to‐vertical...
For short-period structures situated on hard rock, accurate characterization of ground motions at high frequencies is critical. Predictions based empirical motion models (GMMs) for generic site conditions carry large uncertainties, especially because the datasets used to develop GMMs are often lacking in observations rock sites. The current state-of-practice perform a V S -[Formula: see text] host-to-target correction, where shear-wave velocity and [Formula: near-surface high-frequency...
In this article, ground-motion models (GMMs) for subduction earthquakes recently developed as part of the Next Generation Attenuation-Subduction (NGA-Sub) project are compared. The four presented in comparison study documented their respective articles submitted along with article. Each these is based on analysis large NGA-Sub database. Three current a global version well separate regionalized models. fourth model was only from Japan, and such applicable Japan. As study, general discussion...
ABSTRACT We develop ground-motion models (GMMs) to characterize the Fourier amplitude spectrum (FAS) for earthquakes in British Columbia (B.C.), Canada. GMMs developed FAS are useful understanding underlying seismological parameters and can be transformed into response spectral values other applications (e.g., probabilistic seismic hazard analysis [PSHA]). The calibrated using a compiled database, referenced B.C. generic hard-rock site condition (shear-wave velocity ∼2285 m/s). separately...
Research Article| November 14, 2017 Application of a Site‐Effects Model Based on Peak Frequency and Average Shear‐Wave Velocity to California Behzad Hassani; Hassani aDepartment Earth Sciences, Western University, 1151 Richmond Street, London, Ontario, Canada N6A 5B7, bhassan7@uwo.ca, gmatkinson@aol.com Search for other works by this author on: GSW Google Scholar Gail M. Atkinson Author Article Information Publisher: Seismological Society America First Online: 14 Nov Online Issn: 1943-3573...
Research Article| March 19, 2019 Comparison of Site Dominant Frequency from Earthquake and Microseismic Data in California Behzad Hassani; Hassani Corresponding Author aCivil Design, Generation Engineering, BC Hydro, 6911 Southpoint Drive, Edmonds A02, Burnaby, British Columbia, Canada V3N 4X8, Behzad.hassani@bchydro.com Search for other works by this author on: GSW Google Scholar Alan Yong; Yong bDepartment the Interior, U.S. Geological Survey, Science Center, 525 South Wilson Avenue,...
Abstract We examine the applicability of Next Generation Attenuation‐West2 (NGA‐West2) site‐effects model (Seyhan and Stewart, 2014), which is a V S 30 ‐based (time‐averaged shear‐wave velocity in upper 30 m) model, to sites central eastern North America (CENA), using NGA‐East ground‐motion database. determine residual site terms by comparing observed CENA amplitudes, adjusted B/C condition ( =760 m/s) western corresponding predicted amplitudes prediction equation for (Yenier Atkinson,...
ABSTRACT We consider the similarities and differences between earthquake microtremor horizontal-to-vertical spectral ratios (eHVSR mHVSR, respectively) using a dataset of 161 sites in southern California. Quantitative comparisons are made terms eHVSR mHVSR lognormal median curves, as well frequencies amplitudes associated with fundamental- higher-mode resonances where present. The results show only 58% eHVSR–mHVSR pairs agree their curve 25% shared resonances, which increases to 68% if flat...
Here, the generalized inversion of S ‐wave amplitude spectra is employed for deriving site response and attenuation (quality factor) in northwest region Iran. A total 279 strong‐motion accelerograms recorded at distances below 200 km from 41 earthquakes with moment magnitudes ranging M w 3.8 to 6.5 are used determine region‐specific model. The responses have been determined all 54 stations individually. bulk data (i.e., 184 records) comes 2012 Ahar–Varzaghan dual Iran their aftershocks. Also,...
Research Article| March 13, 2018 Adjustable Generic Ground‐Motion Prediction Equation Based on Equivalent Point‐Source Simulations: Accounting for Kappa Effects Behzad Hassani; Hassani Search other works by this author on: GSW Google Scholar Gail M. Atkinson Author and Article Information Publisher: Seismological Society of America First Online: 13 Mar Online Issn: 1943-3573 Print 0037-1106 © Bulletin the (2018) 108 (2): 913–928. https://doi.org/10.1785/0120170333 history Cite View This...
Research Article| June 08, 2016 Modeling Site Amplification in Eastern Canada on a Regional Scale Sebastian Braganza; Braganza aDepartment of Earth Sciences, Biological & Geological Sciences Building, Western University, 1151 Richmond Street, London, Ontario, N6A 5B7sbragan@uwo.ca Search for other works by this author on: GSW Google Scholar Gail M. Atkinson; Atkinson Hadi Ghofrani; Ghofrani Behzad Hassani; Hassani Luc Chouinard; Chouinard bDepartment Civil Engineering and Applied Mechanics,...
ABSTRACT We use an equivalent point-source ground-motion model (GMM) to characterize subduction earthquakes (interface and in-slab) in Japan. The model, which is calibrated using the newly published Next Generation Attenuation (NGA) Subduction database (Bozorgnia et al., 2020), provides a useful complement more traditional empirical NGA models developed from same database. utility of approach lies its ability aid interpretation observed trends data guide modifications GMM for application...
We describe an efficient method to determine moment magnitude and stress parameter in near real time, the immediate aftermath of a small‐to‐moderate earthquake ( M ∼3–6), from ShakeMap ground‐motion parameters (5% damped pseudospectral acceleration) at 1 Hz, 0.33 Hz, 10 Hz and/or peak ground acceleration. The methodology is based on relating source attenuation within context generic stochastic point‐source model, provide event‐specific prediction equation (GMPE) that will reliably predict...
This article evaluates linear simulation-based and empirical site amplification models including natural period dependency parameters to account for the distinctive behavior near fundamental frequencies resulting from sharp impedance contrast between soil underlying hard bedrock in central eastern North America (CENA). The are developed using 581,685 frequency-domain analyses generated a parametric study include V S 30 -scaling ( T nat ) parameters. derived residuals of ground-motion two...