ASSOCIATION OF ENVIRONMENTAL AND ENGINEERING GEOLOGISTS GREAT BASIN SECTION
DATE: Thursday February 16, 2017
Dr. John Louie (Professor of Geophysics Ph.D., P.E., D. PE, Nevada Seismological Laboratory, UNR, Reno, Nevada)
Dr. Stephen Dickenson (Principal, New Albion Geotechnical, Inc. Reno, Nevada)
TOPIC: Characterization of Earthquake Ground Motions for Engineering Design in the Reno Basin: Geotechnical and Seismological Perspectives
LOCATION: BEST WESTERN AIRPORT PLAZA COURT RESTAURANT 1981 TERMINAL WAY RENO, NEVADA 89502
SOCIAL HOUR: 5:30 PM
DINNER: 6:30 PM
PRESENTATION: 7:00 PM
RSVP NO LATER THAN 5PM, TUESDAY FEBRUARY 14TH @ 775-303-8271 or ATHIBEDEAU@NEWFIELDS.COM
COST: Members: $25.00; non-members: $29.00
Student dinners are sponsored by Merrily Graham and Gary Luce.
ABSTRACT: Current seismic codes for buildings and bridges define the earthquake ground motions used for design on the basis of regional seismic hazard assessment, bedrock characteristics, and adjustment factors for site response (i.e., Site Coefficients). The Site Coefficients have been developed from strong motion recordings supplemented with computational results from one-dimensional dynamic soil response analyses. The 1-D nature of the site response assessment precludes consideration of 2-D and 3-D effects on the characteristics of the ground motions, therefore the influence of Basin Effects are not explicitly accounted for in the code-based seismic hazard assessment. While the possible importance of Basin Effects on design ground motions is mentioned in the Commentary of the codes, little guidance is provided for practitioners in regions featuring geologic basins, such as Reno, Las Vegas, Los Angeles, and Seattle. Drs. Dickenson and Louie will present insights gleaned from recent civil engineering projects that have addressed Basin Effects on strong ground motions, and share observations made in the Reno Basin using recorded data from earthquakes in the region, and computational models of 3-D basin effects. The focus of the joint presentation is on the seismological and engineering characterization of earthquake ground motions in the Reno Basin. The presentation will address the implications for engineering practice in Reno and highlight the benefits of integrated project interaction by seismologists, earth scientists, and geotechnical engineers.
Dr. Dickenson has been active in geotechnical earthquake engineering research, education, and professional practice since 1985. His international project experience and applied research has focused primarily in the areas of seismic hazard evaluation, seismic ground motion characterization, dynamic soil response, liquefaction evaluation and mitigation, slope stability and seismically-induced ground deformation, dynamic soil-foundation–structure interaction (SFSI), and performance-based seismic design of major civil infrastructure. He has served on several professional committees charged with developing seismic guidelines, standards, and codes for major civil infrastructure, with incorporation of performance-based design principles.
Prof. Louie has been active in exploration seismology and geotechnical research and education since 1982. He has been teaching at UNR for 25 years, sponsoring and advising 22 M.S. and Ph.D. graduates. Prof. Louie invented the “refraction microtremor” shear-wave velocity measurement technique. SeisOpt® ReMi™ has been available commercially from Optim since 2004. The results of Prof. Louie’s largest project, a three-year program of over 10,000 ReMi™ measurements in Clark County, will appear in the April 2017 issue of the Bulletin of the Seismological Society of America.