Characteristics of the 17 May 2013 M 4.5 Ladysmith, Quebec, Earthquake

Atkinson, Gail M.; Assatourians, Karen; Lamontagne, Maurice

doi:10.1785/0220130160

Cited by 5 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hollow triangles are the locations of other landslides of~1020 cal BP (after Brooks 2015). Dotted lines are some major faults of interest in the region (after Atkinson et al 2014, Bent et al 2015, and Lamontagne et al 2020 Geotechnical studies of selected landslides…”

Section: Introductionmentioning

confidence: 99%

Geotechnical investigations of an earthquake that triggered disastrous landslides in eastern Canada about 1020 cal BP

Wang

2020

Geoenviron Disasters

View full text Add to dashboard Cite

Geotechnical studies are carried out to investigate the location and magnitude of a prehistoric earthquake in eastern Canada. Previous studies identified 12 sensitive clay landslides of about 1020 cal BP in the Ottawa-Gatineau region, including one of the most disastrous slope failures in eastern Canada. The landslides were hypothesized to have been triggered by an earthquake. In the current study, three of those landslides are investigated to understand their failure mechanisms. The study sites form a triangle of lateral distances of about 38, 38 and 35 km. Micro-seismic surveys, cone penetrometer tests, vane shear tests, soil sampling and laboratory testing are conducted to collect geotechnical data. Slope stability models are constructed to calculate threshold ground accelerations required to trigger the landslides. The ground accelerations are used with Ground-Motion Prediction Equations to triangulate the earthquake. The results indicate an earthquake of a minimum moment magnitude of 5.9 near Eardley, Quebec.

show abstract

Section: Introductionmentioning

confidence: 99%

Geotechnical investigations of an earthquake that triggered disastrous landslides in eastern Canada about 1020 cal BP

Wang

2020

Geoenviron Disasters

View full text Add to dashboard Cite

show abstract

“…Published studies that calculated the focal mechanism of this earthquake used a variety of methods based on the records from the Canadian National Seismograph Network (CNSN) and the U.S. Transportable Array (USTA) (Herrmann, 2013; MaAtkinson et al, 2014;Bent et al, 2015). The proposed focal mechanisms indicated oblique thrust faulting on a northwest striking plane.…”

mentioning

confidence: 99%

Three dimensional nonlinear simulation, sensitivity analysis and increasing the maximum frequency to 2.5 Hz using a physics-based method for basins in Ottawa, Canada

Esmaeilzadeh¹

View full text Add to dashboard Cite

We performed 3-D nonlinear-viscoelastic ground motion simulations using a finite difference modeling method in a frequency range of 0.1 to 1 Hz in the Kinburn basin, Ottawa, Canada, for large earthquakes. Comparing the records and simulated velocity time series showed that regular viscoelastic simulations could model the ground motions at the rock and soil sites in the Kinburn basin for the Ladysmith earthquake (Mw=4.7). Using nonlinear-viscoelastic ground motion simulations for the scaled Ladysmith earthquake (Mw=7.5) significantly reduced the amplitude of the horizontal components of the Fourier spectrum and the predicted PGA and PGV values compared to regular linear viscoelastic simulations. Further, using a finite fault source (Mw=7) for the nonlinear-viscoelastic simulation decreased PGAs of the horizontal components. Our sensitivity analysis of simulations for different seismic moments showed that the PGV values exponentially increased with moment magnitude. Using a Gaussian source function with a short half duration increased the PGVs and the amplitude of velocity Fourier spectrum. Relaxation times and relaxation coefficients for viscoelastic simulation significantly increased PGV, the amplitude of the PSA ratio, and the velocity Fourier spectrum for a small earthquake. Employing a small soil Q model reduced PGV, PSA of soil/rock ratios, and the amplitude of velocity Fourier spectrum. Using finite fault model for a large earthquake (Mw =7) significantly reduced the PGV values relative to a point source model. We increased the maximum frequency to 2.5 Hz in FD modeling using a dual grid size method for two basins (Kinburn and Orleans basins in Ottawa, Canada). The simulated velocity time series from the dual grid size method provided better results compared to the results of the single grid size, although there were large differences between the amplitude of the velocity Fourier spectrum of the simulations and the amplitude of the records, particularly at low frequencies (<1 Firstly, I would like to express my sincere gratitude to my supervisor Prof. Dariush Motazedian for the continuous support of my Ph.D study and related research, for his patience, motivation, and immense knowledge. His guidance helped me in all the time of research and writing of this thesis. I could not have imagined having a better advisor and mentor for my Ph.D study. I would also wish to express my gratitude to Dr. James Hunter for extended discussions and valuable suggestions which have contributed greatly to the improvement of the thesis. I would also like to thank the research team, Steve, Sylvia, Sherry, Parisa, and Shutian who I learned a lot from them, through their personal and scholarly interactions, their suggestions at various points of my research. Thank you to my fellow grad students and the staff and faculty of the Department of Earth Sciences for the discussions on this topic and others. This research was supported by the Natural Sciences and Engineering Research Council of Canada under the Discovery Grant program and ...

show abstract

A model for estimating amplification effects on seismic hazards and scenario ground motions in southern Ontario

Braganza

Atkinson

2017

Can. J. Civ. Eng.

View full text Add to dashboard Cite

Site amplification effects in southern Ontario are highly variable and strongly influence felt effects and damage potential. Site parameters such as shear-wave velocity in the top 30 metres of soil (VS30), traditionally used to estimate site amplification, are not well known in this region. Thus, regional maps of shaking potential and seismic hazard are often overgeneralized. In this study, a site amplification model based on peak frequency (fpeak) is compared to one based on VS30, as given by the 2015 National Building Code of Canada (NBCC). Earthquakes and scenario events are used to estimate ground motions and shaking intensities. It is shown that both models generally predict similar felt intensities but show significant differences in their predicted amplification of ground motions as a function of frequency. The results of this study support the use of fpeak as a site response variable for estimating amplification effects in southern Ontario.

show abstract

Characteristics of the 17 May 2013 M 4.5 Ladysmith, Quebec, Earthquake

Cited by 5 publications

References 26 publications

Geotechnical investigations of an earthquake that triggered disastrous landslides in eastern Canada about 1020 cal BP

Geotechnical investigations of an earthquake that triggered disastrous landslides in eastern Canada about 1020 cal BP

Three dimensional nonlinear simulation, sensitivity analysis and increasing the maximum frequency to 2.5 Hz using a physics-based method for basins in Ottawa, Canada

A model for estimating amplification effects on seismic hazards and scenario ground motions in southern Ontario

Contact Info

Product

Resources

About