Technical Reports

Ulmer K.J., Hudson K.S., Brandenberg S.J., Zimmaro P., Pretell R., Carlton B., Kramer S.L., Stewart J.P. (2024). Next Generation Liquefaction Models for Susceptibility, Triggering, And Manifestation, Rev. 1. Research Information Letter, Office of Nuclear Regulatory Research, United States Nuclear Regulatory Commission. Report n. RIL2024-13.

Journal Publications

Hudson K.S., Ulmer K.J., Zimmaro P., Kramer S.L., Stewart J.P., Brandenberg S.J. (2023).Unsupervised machine learning for detecting soil layer boundaries from cone penetration test data. Earthquake Engineering and Structural Dynamics, 52, 3201-3215.

Hudson K.S., Ulmer K.J., Zimmaro P., Kramer S.L., Stewart J.P., Brandenberg S.J. (2024). Relationship between fines content and soil behavior type index at liquefaction sites. Journal of Geotechnical and Geoenvironmental Engineering, 150(5), 06024001.

Brandenberg S.J., Zimmaro P., Stewart J.P., Kwak D.Y., Franke K.W., Moss R.E.S., Cetin K.O., Can G., Ilgac M., Stamatakos J., Weaver T., Kramer S.L. (2020). Next generation liquefaction database. Earthquake Spectra, 36, 939-959.

Stewart, JP, SL Kramer, DY Kwak, MW Greenfield, RE Kayen, K Tokimatsu, JD Bray, CZ Beyzaei, M Cubrinovski, T Sekiguchi, S Nakai, Y Bozorgnia (2016). PEER-NGL project: Open source global database and model development for the next-generation of liquefaction assessment procedures. Soil Dyn. Earthquake Eng., 91, 317–328.

Conference Publications

Ulmer K.J, Hudson K.S., Brandenberg S.J., Zimmaro P., Kramer S.L., Stamatakos J., Stewart J.P. (2024). Next Generation Liquefaction Project, Part 1: Overview (Abstract). DOE/NRC Natural Phenomena Hazards Meeting, Rockville, MA (USA), 29-30 October.

Hudson K.S., Ulmer K.J, Zimmaro P., Brandenberg S.J., Kramer S.L., Stewart J.P. (2024). Next Generation Liquefaction Project, Part 2: SMT’s Models for Susceptibility, Triggering, and Manifestation (Abstract). DOE/NRC Natural Phenomena Hazards Meeting, Rockville, MA (USA), 29-30 October.

Zimmaro P., Hudson K.S., Ulmer K.J., Brandenberg S.J., Stewart J.P., Kramer S.L. (2024). A machine learning-based analysis of liquefaction input factors using the next generation liquefaction database. Proc. 18th World Conference on Earthquake Engineering (WCEE2024), Milan (Italy), 30 June – 5 July.

Hudson K.S., Ulmer K.J., Brandenberg S.J., Zimmaro P., Kramer S.L., Stewart J.P. (2024). A framework for probabilistic assessment of liquefaction manifestation (Abstract + Poster). Earthquake Engineering Research Institute Annual Meeting, 9-12 April, Seattle, WA (USA).

Hudson K.S., Ulmer K., Brandenberg S.J., Zimmaro P., Kramer S.L., Stewart J.P. (2024). A framework for probabilistic assessment of liquefaction manifestation. Geo-Congress 2024: Geotechnics of Natural Hazards. Vancouver, British Columbia, Canada, February , Geotechnical Special Publication 349, 152–160.

Hudson K.S., Brandenberg S.J., Zimmaro P., Ulmer K., Kramer S.L., Stewart J.P. (2023). Kriging interpolation of ground motion residuals at liquefaction case history sites. Geo-Congress 2023, Geotechnics of Natural Hazards, Los Angeles, CA (USA), March 26–29. Geotechnical Special Publication, 338, 365-372.

Hudson K.S., Zimmaro P., Ulmer K., Carlton B., Stuedlein A., Jana A., Dadashiserej A., Brandenberg S.J., Stamatakos J., Kramer S.L., Stewart J.P. (2022). Laboratory component of Next-Generation Liquefaction project database. Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering, Beijing (China), August 15-17, Geotechnical, Geological and Earthquake Engineering book series, 52, 1865–1874.

Ulmer K.J., Zimmaro P., Brandenberg S.J., Çetin K.O., Franke K.W., Moss R.E.S., Can G., Hudson K.S., Ilgaç M. (2022). Next Generation Liquefaction Database and Cloud Computing (Abstract). 12th National Conference on Earthquake Engineering, EERI, Salt Lake City, UT (USA), June 27 - July 1.

Ulmer K.J., Carlton B.D. (2022). Review of available data on the effects of confining pressure and initial static shear stress for use in liquefaction triggering analyses. 12th National Conference on Earthquake Engineering, EERI, Salt Lake City, UT (USA), June 27 - July 1.

Hudson K.S., Brandenberg S.J., Kramer S.L., Ulmer K., Zimmaro P. (2022). NGL Supported Modeling Team Approach (Abstract). 12th National Conference on Earthquake Engineering, EERI, Salt Lake City, UT (USA), June 27 - July 1.

Stamatakos J., Stewart J.P., Kramer S.L., Brandenberg S.J., Zimmaro P., Ulmer K.J. (2022). Next Generation Liquefaction (NGL) Overview (Abstract). 12th National Conference on Earthquake Engineering, EERI, Salt Lake City, UT (USA), June 27 - July 1.

Stewart J.P., Brandenberg S.J., Kramer S.L., Stamatakos J., Ulmer K.J. (2022). Next-Generation Liquefaction Database and Models (Abstract). 12th National Conference on Earthquake Engineering, EERI, Salt Lake City, UT (USA), June 27 - July 1.

Hudson K.S., Stewart J.P., Brandenberg S.J., Zimmaro P. (2021). Kriging interpolation of ground motion intensity measure residuals for next-generation liquefaction project. (Abstract + Poster). Southern California Earthquake Center (SCEC) Annual Meeting 2021, Online, September 12-17.

Zimmaro P. Brandenberg S.J., Stewart J.P., Hudson K.S. (2020). Next Generation Liquefaction: a community discussion. Pacific Earthquake Engineering Research Center (PEER) Annual Meeting, University of California, Berkeley, CA, January 17.

Hudson K.S., Zimmaro P., Rangel C., Brandenberg S.J., Stewart J.P. (2020). Laboratory component of next generation liquefaction database. 17th World Conference on Earthquake Engineering (WCEE), Sendai (Japan).

Zimmaro P., Brandenberg S.J., Bozorgnia Y., Stewart J.P., Kwak D.Y., Cetin K.O., Can G., Ilgac M., Franke K.W., Moss R.E.S., Kramer S.L., Stamatakos J., Juckett M., Weaver T. (2019). Quality control for next-generation liquefaction case histories. 7th lnternational Conference on Earthquake Geotechnical Engineering (VII ICEGE), Rome (Italy), June 17-20.

Brandenberg S.J., Kwak D.Y., Zimmaro P., Bozorgnia Y., Kramer S.L., Stewart J.P. (2018). Next-generation liquefaction (NGL) case history database structure. 5th Decennial Geotechnical Earthquake Engineering and Soil Dynamics Conference. Austin, TX (USA), June 10-13. Geotechnical Special Publication, 426-433.

Zimmaro P., Kwak D.Y., Stewart J.P., Brandenberg S.J., Stamatakos J., Juckett M., Weaver T., Kramer S.L. (2018). Next generation liquefaction case history database. Chief of Nuclear Safety (CNS) – U.S. Nuclear Regulatory Commission (NRC): Natural Phenomena Hazards Meeting, Rockville, MD, October 23-24.

Zimmaro P., Kwak D.Y., Brandenberg S.J., Stewart J.P. (2018). NGL: an open source global database for next-generation of liquefaction assessment. SSA-LACSC scientific conference - Seismology of the Americas. Miami, FL, May 14-17.

Zimmaro P. (2018). Next generation liquefaction (NGL) case history database. Pacific Earthquake Engineering Research Center (PEER) Researchers' Workshop, Richmond Field Station, University of California, Berkeley, CA, August 8.

Zimmaro P., Stewart J.P. (2017). NGL: open source global database and model development for next-generation of liquefaction assessment procedures. Theme lecture, EERI 69th Annual Meeting, Portland, OR, March 8.

Stewart, JP, SL Kramer, DY Kwak, MW Greenfield, RE Kayen, K Tokimatsu, JD Bray, CZ Beyzaei, M Cubrinovski, T Sekiguchi, S Nakai, and Y Bozorgnia (2015). “PEER-NGL Project: Open source global database and model development for the Next-Generation of Liquefaction assessment procedures,” Proc. 6th Int. Conf. Earthquake Geotech. Eng., Christchurch, New Zealand, Paper No. 799 (electronic file).