Education

Research Description

Dr. Cabas's research interests include the assessment of seismic hazards, performance-based design in geotechnical engineering, the prediction of the response of soils and foundation systems to seismic loading and dynamic soil-foundation-structure interaction. Her research focuses particularly on the advancement of the current understanding of the impact that local soil conditions have on ground motions, improving the assessment of site-specific seismic hazards, and elucidating the correlation between ground motion parameters and structural response and damage.

Honors and Awards

• NSF Faculty Early Career Development (CAREER) Award, 2022
• Center of Geospatial Analytics Faculty Fellow, 2022
• EERI Shah Family Innovation Prize, 2021
• New Faces in the ASCE Geo-Institute, 2021
• NC State Impact Scholar, 2021
• NSF-Enabling the Next Generation of Hazards and Disaster Researchers Fellowship, 2019
• NCSU Women and Minorities in Engineering Program Award, 2019
• Outstanding Reviewer, ASCE Journal of Geotech. and Geoenvironmental Engineering, 2018
• Fellow, American Society of Civil Engineers (ASCE) Excellence in Civil Engineering Education (ExCEEd), 2017
• EERI Best Graduate Student Paper, 2014

Publications

Quantifying the Error Associated with the Elastic Halfspace Assumption in Site Response Analysis

Cabas, A., Rodriguez-Marek, A., Green, R. A., & Ji, C. (2022), JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 10. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002893

Effects of Nonlinear Soil Behavior on Kappa (kappa): Observations from the KiK-Net Database

Ji, C., Cabas, A., Bonilla, L. F., & Gelis, C. (2021), BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 8. https://doi.org/10.1785/0120200286

Geotechnical lessons from the M-w 7.1 2018 Anchorage Alaska earthquake

Cabas, A., Beyzaei, C., Stuedlein, A., Franke, K. W., Koehler, R., Zimmaro, P., … Lorenzo-Velazquez, C. (2021), EARTHQUAKE SPECTRA, 11. https://doi.org/10.1177/87552930211012013

Introduction to the Special Section on Advances in Site Response Estimation

Kaklamanos, J., Cabas, A., Parolai, S., & Gueguen, P. (2021, August), BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, Vol. 8. https://doi.org/10.1785/0120210152

Site Effects on Ground Motion Directionality: Lessons from Case Studies in Japan

Ramos-Sepulveda, M. E., & Cabas, A. (2021), SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 8. https://doi.org/10.1016/j.soildyn.2021.106755

Turning Disaster into Knowledge: Geotechnical Aspects of the 2018 Mw 7.1 Anchorage Alaska Earthquake

Cabas, A., Beyzaei, C., Franke, K., Koehler, R., Pierce, I., Stuedlein, A., … Christie, S. (2020), ASCE Geotechnical Special Publication: Proceedings from ASCE GeoCongress. Presented at the ASCE GeoCongress 2020, Minneapolis, MN. https://doi.org/10.1061/9780784482810.020

Within station variability in kappa: evidence of directionality effects

Ji, C., Cabas Mijares, A., Cotton, F., Pilz, M., & Bindi, D. (2020), Bulletin of the Seismological Society of America, 110(3), 1247–1259. https://doi.org/10.1785/0120190253

Assessment of Lateral Spreading Case Histories from Recent Seismic Events: Port-Au-Prince, Haiti 2010, and Christchurch, New Zealand 2011

Ingabire-Abayo, N., Cabas, A., & Montoya, B. (2019), In J. Ching, D. Li, & J. Zhang (Eds.), Proceedings from the 7th International Symposium on Geotechnical Safety and Risk. Taipei, Taiwan: Research Publishing.

Assessment of Lateral Spreading Estimations through the Lens of Centrifuge Modeling

Doostmohammadibueini, M., Cabas, A., & Montoya, B. (2019), Proceedings from ASCE GeoCongress 2019. Presented at the Eighth International Conference on Case Histories in Geotechnical Engineering, Philadelphia, Pennsylvania.

Assessment of the Contribution of Input Motion Selection Procedures to Uncertainty in Ground Motion Intensity Measures

Cabas, A., Kaklamanos, J., Kottke, A., & Chowdhury, I. (2019). , [USGS Final Report].

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Grants

Rapid Post-Earthquake Displacement-Based Assessment Methodology for Bridges

State of Alaska, Department of Transportation(1/10/22 - 6/30/25)

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Rapid Post-Earthquake Displacement-Based Assessment Methodology for Bridges

Sponsor: State of Alaska, Department of Transportation

Start Date: 1/10/22

End Date: 6/30/25

Abstract

This proposal aims to develop a rapid seismic bridge assessment method that can be used for planning (via scenarios), and for post-earthquake assessment (inspection prioritization). Unlike existing methods which are largely probabilistic, and focused on high level assessment, the proposed methodology is sufficiently versatile that it can provide a range of information, spanning from deterministic bridge specific performance, to broader assessments of bridge vulnerability. The procedure relies upon the Direct Displacement-Based Design approach as the analysis engine, and has three components: (1) Bridge metadata; (2) Bridge limit state parameters; and (3) Seismic Hazard characterization. Given any 2 of the above, the third may be determined. While the approach will function with very course data (i.e. basic metadata such as span lengths, column diameter, and height; basic limit state parameters, such as limit state displacement; and course hazard definition (such as a 3 point code-based spectra), with more detailed information, the fidelity of the outcome increases significantly. The work described in this proposal will define limit state parameters for Alaska bridges and characterize the seismic hazard. The framework for the rapid assessment approach will also be developed and applied to a series of bridges. The final outcome will be detailed plans for development of a rapid assessment application which would be developed in a future phase of the research.

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CAREER: Multiscale Probabilistic Characterization of Seismic Site Response in Highly Uncertain Environments

National Science Foundation (NSF)(8/01/22 - 7/31/27)

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CAREER: Multiscale Probabilistic Characterization of Seismic Site Response in Highly Uncertain Environments

Sponsor: National Science Foundation (NSF)

Start Date: 8/01/22

End Date: 7/31/27

Abstract

This CAREER proposal will create a new multiscale probabilistic approach to quantify the response of sedimentary deposits to earthquake ground shaking (site response) in highly uncertain environments. Efforts toward improving resiliency of urban environments are challenged by variable seismic demands over large areas (e.g., the city of Los Angeles or along the alignment of distributed infrastructure such as pipelines), geohazards, and uncertainties associated with system-level performance (e.g., lifelines networks). Drinking water and wastewater utilities are critical lifelines after seismic events because of the potential impairment of the ability to fight fires, and negative effects of earthquake damage on public health, and the environment. Hence, this CAREER proposal focuses on water supply distribution systems (WSDS) and the challenges in incorporating multiscale modeling of site response into their seismic hazard assessments. Numerical modeling, geospatial analytics and uncertainty quantification will be used to develop the first conditional site amplification functions at local and regional scales that incorporate available data, spatial correlations, and uncertainty. Bayesian Networks (BN) and decision-support tools will enable the otherwise computationally costly system-level probabilistic seismic hazard analysis (multi-site PSHA) to be applied to WSDS. The proposed work is important because incorporating a robust regionalization of site effects into an optimized probabilistic approach that accounts for uncertainty has the potential to transform seismic hazard assessments of WSDS. This work is urgently needed in other highly uncertain environments (i.e., with scarcity of data) in the US (e.g., central and eastern US) and other earthquake-prone regions, such as mega-cities in Latin America. Thus, the educational and outreach goal of this work is to consolidate retention strategies for, and broaden participation from, women and Latin American students in STEM through a multifaceted educational plan that includes the launch of the Earthquake Engineering and Seismology Community Alliance in Latin America (E2SCALA) program.

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Coastal Plain Amplification and Hazard Model for the National Seismic Hazard Maps: Collaborative Research with University of Memphis and Merrimack College

US Geological Survey (USGS)(1/01/22 - 12/31/22)

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Coastal Plain Amplification and Hazard Model for the National Seismic Hazard Maps: Collaborative Research with University of Memphis and Merrimack College

Sponsor: US Geological Survey (USGS)

Start Date: 1/01/22

End Date: 12/31/22

Abstract

Previous research on earthquake ground motions along the Atlantic and Gulf Coastal Plains show significant frequency-dependent deviations in site response relative to other areas in the Central and Eastern United States (CEUS). For instance, amplitudes and durations of ground motions are shown to be strongly correlated with sediment thickness. Even though regional site response models are available for the region, the ones that account for sediment thickness only capture linear amplifications and fail to constrain the uncertainty in velocity models. This project addresses this gap by incorporating nonlinear soil behavior at a regional scale and fully incorporating it into a probabilistic seismic hazard analysis. This work will have a significant impact on the next National Seismic Hazard Maps.

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Improving the Assessment of Site-Specific Seismic Hazards Through the Lens of Novel Attenuation Models

US Dept. of Interior (DOI)(5/15/19 - 5/14/20)

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Improving the Assessment of Site-Specific Seismic Hazards Through the Lens of Novel Attenuation Models

Sponsor: US Dept. of Interior (DOI)

Start Date: 5/15/19

End Date: 5/14/20

Abstract

The main objective of this study is to improve current definitions of host and target site-specific attenuation in partially nonergodic probabilistic seismic hazard analysis (PSHA). Site-specific attenuation is often defined by means of the spectral decay parameter kappa, but ther is currently no consistent/compatible attenuation models for the host a target regions. The main challenge is the lack of data in low to moderate seismicity regions (i.e., target regions), which does not allow the use of the acceleration spectrum methodology to compute kappa (as it is often use for the host regions). Additionally, a novel model for kappa values is proposed, so that the contributions from the attenuation experienced in the rock mass and the overlying soil profile can be treated separately. This decomposition could prove very useful in partially nonergodic PSHA. Finally, our current understanding of kappa from a geotechnical engineering perspective will be improved by further decomposing the kappa value corresponding to the soil profile into material damping and scattering contributions.

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Building a Stronger and Diverse Professional Network to Support the Growth of the Geotechnical Earthquake Engineering Research Group at North Carolina State University

National Science Foundation (NSF)(9/07/17 - 4/30/18)

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Building a Stronger and Diverse Professional Network to Support the Growth of the Geotechnical Earthquake Engineering Research Group at North Carolina State University

Sponsor: National Science Foundation (NSF)

Start Date: 9/07/17

End Date: 4/30/18

Abstract

The overarching goal of this project is not only to enhance the project leader’s professional network and potential for new collaborations, but also to broaden the research program at North Carolina State University (NCSU). The proposed project will have two stages. First, a three-day visit of the project leader to the University of Texas at Austin (UT Austin), and a subsequent visit of Professor Ellen Rathje to NCSU. During the first stage, discussions on the project leader’s National Science Foundation (NSF)CAREER proposal will take place, as well as a laboratory tour to provide guidance on the purchase of a resonant column and torsional shear device. Networking opportunities with Dr. Rathje’s research group and other faculty members at UT Austin will also be included in this first stage. Professor Rathje’s visit to NCSU will foster more collaboration opportunities as follow-up discussions on research projects develop. She will be able to provide feedback on the progress of graduate student members in the geotechnical earthquake engineering research group at NCSU, and will participate as the guest speaker at a graduate seminar. Additionally, Prof. Rathje will also interact with the geotechnical engineering female faculty at NCSU at a special networking event.

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Assessment of the Contribution of Input Motion Selection Procedures to Uncertainty in Ground Motion Intensity Measures

US Geological Survey (USGS)(1/01/18 - 12/31/18)

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Assessment of the Contribution of Input Motion Selection Procedures to Uncertainty in Ground Motion Intensity Measures

Sponsor: US Geological Survey (USGS)

Start Date: 1/01/18

End Date: 12/31/18

Abstract

The importance of properly characterizing ground-motion intensity measures for seismic hazard assessment is unequivocally large. However, only a few studies have investigated the degree to which the uncertainty resulting from traditional input motion selection protocols introduces errors in the estimation of ground-motion intensity measures at the surface. This study will compare current practices for input motion selection, identify shortcomings in these practices, and investigate their impact on the uncertainty in ground-motion intensity measures. Moreover, recommendations for improvements to existing input motion selection procedures will be proposed. Comprehensive ground response analyses at two representative sites, one in the western United States (WUS: California) and one in the central and eastern United States (CEUS: Boston, Massachusetts), will be performed. These two sites not only represent different geological and geotechnical conditions, but different levels of seismicity: the WUS site is in a region of high seismicity in which a small number of faults dominates the hazard, and the CEUS site is in a region of moderate seismicity in which the sources of hazard are much more diffuse.

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