William Lettis
Senior Principal Geologist
– Seismic hazard analysis
– Fault rupture hazard analysis
– Engineering geology
– Quaternary geology
– Uncertainty analysis
Dr. Lettis founded LCI in 2011 and has over 35 years of experience performing regional and site investigations to assess geologic and seismic hazards for large engineered facilities, including nuclear plants, dams, bridges, pipelines, and LNG terminals. With over 100 publications, Dr. Lettis is a recognized authority on the assessment of seismic hazards throughout the world. He currently is serving on the California Geological Survey’s Geologic Mapping Committee and is a recent Member of the US Geological Survey’s Steering Committee for development of the National Seismic Hazard Map. He has published two NUREG volumes that are cited for guidance in the US NRC’s Regulatory Guideline 1.208 for development of site-specific Ground Motion Response Spectra (GMRS) for nuclear facilities, and has directed or participated in 6 Senior Seismic Hazard Advisory Committees (SSHAC) Level 3 and 18 SSHAC Level 2 assessments for seismic source characterization for nuclear facilities. Bill was also an invited speaker at the DSOD-sponsored seminar on earthquake engineering for the Association of State Dam Safety Officials on methods for assessing fault activity.
Key Projects:
– SSHAC Level 3 Study for Nuclear Plants, Taiwan
– Long Term Seismic Program Update, Diablo Canyon Nuclear Power Plant, Pacific Gas and Electric Company
– Oroville Emergency Response and Recovery, California Department of Water Resources
– Geologic Characterization and Fault Displacement Hazard Analyses, California High Speed Train
– Central and Eastern United States Seismic Source Characterization for Nuclear Facilities (CEUS SSC)