@article{ji_cabas_kottke_pilz_macedo_liu_2023, title={A DesignSafe earthquake ground motion database for California and surrounding regions}, volume={39}, ISSN={["1944-8201"]}, DOI={10.1177/87552930221141108}, abstractNote={This article presents a ground motion database for California and its close surroundings (i.e. areas near the border in Nevada, Oregon, and Arizona) from earthquakes between 1999 and 2021. This data set includes events with magnitudes larger than 3.2 and focal depths less than 40 km, and it is available on DesignSafe. Ground motion records and events included in this data set are collected from 65 different seismic networks and processed with an automated software tool called gmprocess, which was developed by the United States Geological Survey (USGS). Path measures such as rupture distance and epicentral distance are computed, 5%-damped spectral accelerations, duration metrics, and other ground motion intensity measures (IMs) are provided for records that pass the quality assurance check performed by the gmprocess toolkit. The quality of processed ground motions is also screened by using outlier detection algorithms and a multiple wave-train arrivals identification algorithm. In addition, site metadata are provided, including wave velocity information (from proxy-based time-averaged shear-wave velocity for the top 30 m, V s30 , and from P- and S-wave measured velocity profiles when available), predominant frequency measured from microtremor-based horizontal-to-vertical ratios (mHVSR), and site-specific (high-frequency spectral decay) [Formula: see text] values computed from multiple ground motions recorded at sites when available. The final database contains 287,804 three-component ground motions recorded at 3709 stations from 2641 earthquakes with magnitudes and distances ranging from 3.2 to 7.2 and 0.15 to 335 km, respectively. This ground motion database contributes to advancing both engineering seismology studies and earthquake engineering applications in shallow crustal tectonic settings.}, number={1}, journal={EARTHQUAKE SPECTRA}, author={Ji, Chunyang and Cabas, Ashly and Kottke, Albert and Pilz, Marco and Macedo, Jorge and Liu, Chenying}, year={2023}, month={Feb}, pages={702–721} }
 @article{na_cabas_montoya_2023, title={Resonant Column Testing Procedure for Microbial-Induced Carbonate- Precipitated Sands}, volume={1}, ISSN={["1945-7545"]}, DOI={10.1520/GTJ20220056}, journal={GEOTECHNICAL TESTING JOURNAL}, author={Na, Kyunguk and Cabas, Ashly and Montoya, Brina M.}, year={2023}, month={Jan} }
 @article{cabas_rodriguez-marek_green_ji_2022, title={Quantifying the Error Associated with the Elastic Halfspace Assumption in Site Response Analysis}, volume={148}, ISSN={["1943-5606"]}, DOI={10.1061/(ASCE)GT.1943-5606.0002893}, number={10}, journal={JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING}, author={Cabas, Ashly and Rodriguez-Marek, Adrian and Green, Russell A. and Ji, Chunyang}, year={2022}, month={Oct} }
 @article{ji_cabas_bonilla_gelis_2021, title={Effects of Nonlinear Soil Behavior on Kappa (kappa): Observations from the KiK-Net Database}, volume={111}, ISSN={["1943-3573"]}, DOI={10.1785/0120200286}, abstractNote={ABSTRACT Soil nonlinear behavior is often triggered in soft sedimentary deposits subjected to strong ground shaking and has led to catastrophic damage to civil infrastructure in many past earthquakes. Nonlinear behavior in soils is associated with large shear strains, increased material damping ratio, and reduced stiffness. However, most investigations of the high-frequency spectral decay parameter κ, which captures attenuation, have focused on low-intensity ground motions inducing only small shear strains. Because studies of the applicability of the κ model when larger deformations are induced are limited, this article investigates the behavior of κ (both κr per record and site-specific κ0 estimates) beyond the linear-elastic regime. About 20 stations from the Kiban–Kyoshin network database, with time-average shear-wave velocities in the upper 30 m between 213 and 626 m/s, are used in this study. We find that the classification scheme used to identify ground motions that trigger soil nonlinear behavior biases estimates of κ0 in the linear and nonlinear regimes. A hybrid method to overcome such bias is proposed considering proxies for in situ deformation (via the shear-strain index) and ground shaking intensity (via peak ground acceleration). Our findings show that soil nonlinearity affects κr and κ0 estimates, but this influence is station dependent. Most κ0 at our sites had a 5%–20% increase at the onset of soil nonlinear behavior. Velocity gradients and impedance contrasts influence the degree of soil nonlinearity and its effects on κr and κ0. Moreover, we observe that other complexities in the wave propagation phenomenon (e.g., scattering and amplifications in the high-frequency range) impose challenges to the application of the κ0 model, including the estimation of negative values of κr.}, number={4}, journal={BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA}, author={Ji, Chunyang and Cabas, Ashly and Bonilla, Luis Fabian and Gelis, Celine}, year={2021}, month={Aug}, pages={2138–2157} }
 @article{cabas_beyzaei_stuedlein_franke_koehler_zimmaro_wood_christie_yang_lorenzo-velazquez_2021, title={Geotechnical lessons from the M-w 7.1 2018 Anchorage Alaska earthquake}, volume={37}, ISSN={["1944-8201"]}, DOI={10.1177/87552930211012013}, abstractNote={The 2018 M w 7.1 Anchorage, Alaska, earthquake is one of the largest earthquakes to strike near a major US city since the 1994 Northridge earthquake. The significance of this event motivated reconnaissance efforts to thoroughly document damage to the built environment. This article presents the spatial variability of ground motion intensity and its correlation with subsurface conditions in Anchorage, the identification of liquefaction triggering in the absence of surficial manifestations (such as sand boils or sediment ejecta), cyclic softening failure in organic soils, and the poor performance of anthropogenic fills subjected to cyclic loading. In addition to lessons from observed ground deformation and geotechnical effects on structures, this article provides case studies documenting the satisfactory behavior of improved ground subjected to cyclic loading and the appropriateness of current design procedures for the estimation of seismically induced sliding displacements of mechanically stabilized earth walls.}, number={4}, journal={EARTHQUAKE SPECTRA}, author={Cabas, Ashly and Beyzaei, Christine and Stuedlein, Armin and Franke, Kevin W. and Koehler, Richard and Zimmaro, Paolo and Wood, Clinton and Christie, Samuel and Yang, Zhaohui and Lorenzo-Velazquez, Cristina}, year={2021}, month={Nov}, pages={2372–2399} }
 @article{kaklamanos_cabas_parolai_gueguen_2021, title={Introduction to the Special Section on Advances in Site Response Estimation}, volume={111}, ISSN={["1943-3573"]}, DOI={10.1785/0120210152}, number={4}, journal={BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA}, author={Kaklamanos, James and Cabas, Ashly and Parolai, Stefano and Gueguen, Philippe}, year={2021}, month={Aug}, pages={1665–1676} }
 @article{ramos-sepulveda_cabas_2021, title={Site Effects on Ground Motion Directionality: Lessons from Case Studies in Japan}, volume={147}, ISSN={["1879-341X"]}, DOI={10.1016/j.soildyn.2021.106755}, abstractNote={Earthquake ground motions (GMs) may display distinct characteristics in all directions within the horizontal plane. However, the causes of GM polarization are still not fully understood. Structural designs use maximum rotated intensity measures (IMRotD100) to accommodate variations of the GM with orientation, but the orientation associated with IMRotD100, β, is not easily predictable. This study investigates the influence of linear site response to observed GM variability with direction. We analyze GMs recorded at the surface and at depth from four stations in the Japanese database, KiK-net. Selected events have moment magnitudes ranging 3–5, and rupture distances within 100 km. Findings provide evidence that site effects contribute to GM directionality, and that directional resonance can be observed at sites lacking significant topographic features. Additionally, values of β at depth are not correlated to the orientation corresponding to their expected polarization (from S-wave radiation patterns), which provides evidence of non-negligible path contributions to GM directionality observed at our study sites.}, journal={SOIL DYNAMICS AND EARTHQUAKE ENGINEERING}, author={Ramos-Sepulveda, Maria Elisa and Cabas, Ashly}, year={2021}, month={Aug} }
 @inproceedings{cabas_beyzaei_franke_koehler_pierce_stuedlein_yang_christie_2020, title={Turning Disaster into Knowledge: Geotechnical Aspects of the 2018 Mw 7.1 Anchorage Alaska Earthquake}, DOI={10.1061/9780784482810.020}, booktitle={ASCE Geotechnical Special Publication: Proceedings from ASCE GeoCongress}, author={Cabas, A. and Beyzaei, C. and Franke, K. and Koehler, R. and Pierce, I. and Stuedlein, A. and Yang, J. and Christie, S.}, year={2020}, month={Feb} }
 @article{ji_cabas mijares_cotton_pilz_bindi_2020, title={Within station variability in kappa: evidence of directionality effects}, volume={110}, ISSN={["1943-3573"]}, DOI={10.1785/0120190253}, abstractNote={ABSTRACT One of the most commonly used parameters to describe seismic attenuation is the high-frequency spectral decay parameter Kappa (κr), yet the physics behind it remain little understood. A better understanding of potential factors that lead to large scatter in estimated values of κr constitutes a critical need for ground-motion modeling and seismic hazard assessment at large. Most research efforts to date have focused on studying the site-to-site and model-to-model variability of κ, but the uncertainties in individual κr estimations associated with different events at a selected site (which we refer to as the within-station variability of κr) remain uncharacterized. As a direct corollary, obtaining robust estimates of the site-specific component κ0, and their corresponding interpretation become a challenge. To understand the sources of the variability observed in κr (and κ0) at a single site, we select 10 Japanese Kiban–Kyoshin network (KiK-net) downhole arrays and investigate the systematic contributions from ground-motion directionality. We observe that κr estimated from a single horizontal component is orientation dependent. In addition, the influence of ground-motion directionality is a function of local site conditions. We propose an orientation-independent κr-value, which is not affected either by ground-motion directionality or by the events’ azimuths. In addition, we find that focal depth of events used in κr calculations affects the estimation of the regional attenuation component κR, which, in turn, influences the within-station variability in the κ0 model.}, number={3}, journal={Bulletin of the Seismological Society of America}, author={Ji, C. and Cabas Mijares, A. and Cotton, F. and Pilz, M. and Bindi, D.}, year={2020}, month={Apr}, pages={1247–1259} }
 @inproceedings{ingabire-abayo_cabas_montoya_2019, place={Taipei, Taiwan}, title={Assessment of Lateral Spreading Case Histories from Recent Seismic Events: Port-Au-Prince, Haiti 2010, and Christchurch, New Zealand 2011}, booktitle={Proceedings from the 7th International Symposium on Geotechnical Safety and Risk}, publisher={Research Publishing}, author={Ingabire-Abayo, N. and Cabas, A. and Montoya, B.}, editor={Ching, J. and Li, D. and Zhang, J.Editors}, year={2019} }
 @inproceedings{doostmohammadibueini_cabas_montoya_2019, place={Philadelphia, PA}, title={Assessment of Lateral Spreading Estimations through the Lens of Centrifuge Modeling}, booktitle={Proceedings from ASCE GeoCongress 2019}, publisher={ASCE Geotechnical Special Publication}, author={Doostmohammadibueini, M. and Cabas, A. and Montoya, B.}, year={2019} }
 @book{cabas_kaklamanos_kottke_chowdhury_2019, title={Assessment of the Contribution of Input Motion Selection Procedures to Uncertainty in Ground Motion Intensity Measures}, author={Cabas, A. and Kaklamanos, J. and Kottke, A. and Chowdhury, I.}, year={2019} }
 @book{koehler_franke_beyzaei_cabas_pierce_stuedlein_yang_2019, place={Anchorage, Alaska}, title={Geotechnical Engineering Reconnaissance of the 30 November 2018 M7.0 Anchorage, Alaska Earthquake}, url={http://www.geerassociation.org/administrator/components/com_geer_reports/geerfiles/2018_Anchorage_Earthquake_Report_Version_1.pdf}, DOI={10.18118/G6P07F}, institution={GEER Association}, author={Koehler, R.D. and Franke, K.W. and Beyzaei, C.Z. and Cabas, A. and Pierce, I. and Stuedlein, A. and Yang, Z.}, year={2019} }
 @inproceedings{chowdhury_cabas_kaklamanos_kottke_greggor_2019, place={Rome, Italy}, title={Ground motion selection using the conditional spectrum: insights for different tectonic environments}, booktitle={Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions: Proceedings of the VII ICEGE Seventh International Conference on Earthquake Geotechnical Engineering}, publisher={CRC Press}, author={Chowdhury, I. and Cabas, A. and Kaklamanos, J. and Kottke, A. and Greggor, N.}, editor={Silvestri, F. and Morcai, N.Editors}, year={2019}, month={May}, pages={1803–1811} }
 @inproceedings{chowdhury_cabas_2018, title={Assessment of the Influence of the Elastic Halfspace on Site Response Estimations}, author={Chowdhury, I.N. and Cabas, A.}, year={2018} }
 @inproceedings{ji_cabas_2018, place={Miami, FL}, title={Investigation of the Dependence of Kappa Values on the Onset of Soil Nonlinearity as Captured by Shear Strain Index (PGV/Vs30)}, booktitle={Seismology of the Americas (joint conference of the Latin American and Caribbean Seismological Commission (LACSC) and the Seismological Society of America (SSA}, author={Ji, C. and Cabas, A.}, year={2018}, month={May} }
 @inproceedings{cabas_rodriguez-marek_2018, place={Austin, TX}, title={Toward improving damping characterization for site response analysis}, booktitle={Proceedings from the ASCE 5th Geotechnical Earthquake Engineering and Soil Dynamics Conference}, publisher={ASCE Geotechnical Special Publication}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2018} }
 @book{rodriguez-marek_dawood_upadhyaya_cabas_2017, title={An empirical study of the parameterization of site response using the KiKnet array}, number={G14AP00017}, author={Rodriguez-Marek, A. and Dawood, H.M. and Upadhyaya, S. and Cabas, A.}, year={2017}, month={Apr} }
 @inproceedings{cabas_rodriguez-marek_2017, title={Estimation of Site-Specific Kappa (κ0)-Consistent Damping Values at Selected Stations from the KiK-net Database}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2017} }
 @article{cabas_rodriguez‐marek_bonilla_2017, title={Estimation of Site‐Specific Kappa (κ0)‐Consistent Damping Values at KiK‐Net Sites to Assess the Discrepancy between Laboratory‐Based Damping Models and Observed Attenuation (of Seismic Waves) in the Field}, volume={107}, ISSN={0037-1106 1943-3573}, url={http://dx.doi.org/10.1785/0120160370}, DOI={10.1785/0120160370}, abstractNote={In this article, we compare field estimates of near-surface attenuation, as captured by site-specific o-values (i.e., o0) with laboratory-based estimates of minimum shear-strain damping (Ÿmin). We propose models for Ÿmin based on o0 measured at selected stations of the KiK-net database, which are found to be generally larger than lowstrain damping values obtained from laboratory testing. The latter can only quantify intrinsic material damping, whereas other attenuation mechanisms such as scattering of the wavefield contribute to field-based estimates. In addition, we evaluate the difference in damping at the surface and at borehole stations to determine the contribution of shallow layers to attenuation as captured by o0-values at the surface. Thus, values of o0 are computed at the surface and at the downhole instrument depth. The difference between
both values, correlates well with the averaged shear-wave velocity over the top 30 m of the profile, VS30, and with the depth to bedrock. Estimates of o0 for hard-rock and stiff sites in Japan are also examined and compared with other regional o0-values proposed for high VS30 materials in New Zealand, Greece, and Switzerland. Two values of o0, which are lower than the corresponding estimates for the aforementioned regions, are deemed potential descriptors of hard-rock conditions in Japan. The ability of the proposed o0-consistent damping models to predict ground motions using the vertical array data from the KiK-net sites has yet to be tested.}, number={5}, journal={Bulletin of the Seismological Society of America}, publisher={Seismological Society of America (SSA)}, author={Cabas, Ashly and Rodriguez‐Marek, Adrian and Bonilla, Luis Fabian}, year={2017}, month={Sep}, pages={2258–2271} }
 @inproceedings{chowdhury_cabas_2017, title={Ground Motions from the August 24, 2016 Rieti Earthquake in Italy}, author={Chowdhury, I.C. and Cabas, A.}, year={2017} }
 @article{cabas_rodriguez-marek_2017, title={V-S-kappa(0) Correction Factors for Input Ground Motions Used in Seismic Site Response Analyses}, volume={33}, ISSN={["1944-8201"]}, DOI={10.1193/22315eqs188m}, abstractNote={Input motions used in seismic site response analyses are commonly selected based on similarities between the shear wave velocity ( V S ) at the recording station, and the reference depth at the site of interest (among other aspects such as the intensity of the expected ground motion). This traditional approach disregards the influence of the attenuation in the shallow crust on site response. Given that this attenuation (damping) can be characterized by the distance-independent high-frequency attenuation parameter κ 0 , a V S -κ 0 correction framework for input motions is proposed to render them compatible with the assumed properties of the reference depth at the site. The proposed correction factors were applied to a subset of recordings from the KiK-net database, and compared to traditional deconvolution. Results indicate that V S -κ 0 corrected motions outperform deconvolved motions in the characterization of the spectral energy in the high-frequency range. However, motions recorded at sites with soft deposits are not good candidates for the V S -κ 0 correction approach. V S -κ 0 corrections also affect amplification functions which are important in the assessment of site-specific seismic hazards.}, number={3}, journal={EARTHQUAKE SPECTRA}, author={Cabas, Ashly and Rodriguez-Marek, Adrian}, year={2017}, month={Aug}, pages={917–941} }
 @article{cabas_rodriguez-marek_2017, title={Vs-κ0 Correction Factors for Input Ground Motions used in Seismic Site Response Analyses}, ISSN={8755-2930}, url={http://dx.doi.org/10.1193/122315EQS188M}, DOI={10.1193/122315EQS188M}, abstractNote={Input motions used in seismic site response analyses are commonly selected based on similarities between the shear wave velocity (V s ) at the recording station, and the reference depth at the site of interest (among other aspects such as the intensity of the expected ground motion). This traditional approach disregards the influence of the attenuation in the shallow crust on site response. Given that this attenuation (damping) can be characterized by the distance-independent high-frequency attenuation parameter 0 , a V s - 0 correction framework for input motions is proposed to render them compatible with the assumed properties of the reference depth at the site. The proposed correction factors were applied to a subset of recordings from the KiK-net database, and compared to traditional deconvolution. Results indicate that V s - 0 corrected motions outperform deconvolved motions in the characterization of the spectral energy in the high-frequency range. However, motions recorded at sites with soft deposits are not good candidates for the V s - 0 correction approach. V s - 0 corrections also affect amplification functions which are important in the assessment of site-specific seismic hazards.}, journal={Earthquake Spectra}, publisher={Earthquake Engineering Research Institute}, author={Cabas, Ashly and Rodriguez-Marek, Adrian}, year={2017}, month={May} }
 @inproceedings{cabas_rodriguez-marek_2017, place={Orlando, Florida}, title={What Can We Learn from Kappa (k) to Achieve a Better Characterization of Damping in Geotechnical Site Response Models?}, DOI={10.1061/9780784480489.001}, booktitle={Geotechnical Frontiers: Seismic Performance and Liquefaction}, publisher={ASCE Geotechnical Special Publication}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2017} }
 @article{cabas_rodriguez-marek_2015, place={San Antonio, TX, USA}, title={Appropriate Ground Motions for Dynamic Analysis of Foundations. IFCEE/Geo-Congress 2015 Geo-Institute National Poster Competition}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2015}, month={Mar} }
 @inproceedings{cabas_rodriguez-marek_montalva_2015, place={Argentina}, title={VS-κ Consistent Input Ground Motions for Site Response Analyses, Case Studies in Concepción and San Pedro, Chile}, booktitle={Proceedings of the XV Pan-American Conference on Soil Mechanics and Geotechnical Engineering, Buenos Aires}, author={Cabas, A. and Rodriguez-Marek, A. and Montalva, G.}, year={2015}, month={Nov} }
 @inproceedings{cabas_2015, place={Boston, MA, USA}, title={VS-κ0 Correction Factors for Input Ground Motions used in Seismic Site Response Analysis}, booktitle={Proceedings of the Earthquake Engineering Research Institute (EERI) 67th Annual Meeting 2015}, author={Cabas, A.}, year={2015}, month={Mar} }
 @inproceedings{cabas_rodriguez-marek_2014, place={Charleston, SC, USA}, title={Influence of the Selection of Input Motions on the Systematic Errors Introduced in Site Response Analyses Conducted in Charleston, SC}, booktitle={Proceedings of the 86th Annual Meeting of the Eastern Section of the Seismological Society of America}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2014}, month={Nov} }
 @inproceedings{cabas_rodriguez-marek_2014, title={The Importance of the Elastic Half-Space Assumption in Site Response Analysis}, booktitle={Proceedings of the Annual Meeting of the Seismological Society of America}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2014}, month={May} }
 @inproceedings{cabas_cárcamo_rodriguez-marek_godfrey_olgun_2014, title={Where to Locate the Elastic Half-Space in Site Response Analysis, A Case Study Using Site Profiles from Charleston, SC, USA}, author={Cabas, A. and Cárcamo, P. and Rodriguez-Marek, A. and Godfrey, B. and Olgun, G.}, year={2014} }
 @article{cabas_rodriguez-marek_2012, title={Ground Motions observed during the August 23rd, 2011 Mineral Virginia Earthquake}, author={Cabas, A. and Rodriguez-Marek, A.}, year={2012}, month={Apr} }