September 2018 Chapter Meeting

Student Chapter Certificate of Accomplishment

The EERI Sacramento Chapter awarded the Sacramento State EERI Student Chapter a certificate of accomplishment.  The certificate of accomplishment was awarded in recognition of their hard work over the last year as they participated in and presented at local professional chapter meetings, participated on the board of directors, and for the outstanding performance at this years International Seismic Design Competition in Los Angeles where they ranked 13th overall. Congratulations Students!

Important Intensity Measures related to Embankment Dam Deformation

Speaker: Richard Armstrong, PhD, PE | California State University, Sacramento

When: August 19, 2018 | 12:00 – 1:00 PM

Where: Old Spaghetti Factory | 1910 J St., Sacramento, CA 95811


In a seismic hazard assessment of an embankment dam, the ground motion intensity measure (IM) deemed important to the dam must first be identified (e.g., spectral acceleration, SA; peak ground velocity, PGV; and Arias intensity, AI). It is important for the IM to relate well to the engineering demand parameter (EDP) of interest. Results from a study are presented that had set out to identify IMs that related to embankment dam deformation. It was found from this study that AI most efficiently predicted embankment dam deformations, followed by CAV. In terms of SA-based IMs, T_s at short periods and then in the general range of the natural period of the dams was seen to be the most efficient SA-based IM. However, in almost all cases, the SA-based IMs were not as efficient as AI. Considering the relative merits of each IM in the context of a seismic hazard analysis, it is noted that the poor predictability of AI relative to other IMs resulted in a higher total uncertainty given an earthquake. Therefore, CAV was deemed the best IM.