Palo Alto Colloquia
September 18, 2014
PREDICTING STRONG EARTHQUAKE SHAKING USING OCEAN WAVES
Dr. Gregory C. Beroza, Geophysics Department, Stanford University
Predicting strong ground motion, as the strong shaking in earthquakes is called, from future earthquakes is among the most important research topics in seismology. Typically, seismologists do this through ground motion prediction equations that express relationships between earthquake characteristics and ground motion intensity. There is relatively little data to constrain these relationships, and in particular, there are few records of ground motion close to large earthquakes. As a result, seismologists are increasingly turning to simulations to compensate for this lack of data. Validating the accuracy of these simulations is critically important. In this talk I present a new approach for strong ground motion prediction. It relies on data that is one million times weaker in amplitude than the earthquake shaking of interest. The method uses the ambient seismic field, which is primarily generated by coupling of wave motion in the fluid ocean to wave motion in the solid Earth, to construct “virtual earthquakes” that can be used to predict long-period strong ground motion for scenario earthquakes.
Dr. Gregory C. Beroza is a faculty member in the Geophysics Department, and is the Wayne Loel Professor of Earth Sciences at Stanford University. He holds a BS degree from UC Santa Cruz and a Ph.D. degree from MIT. He has been Deputy Director, in charge of science planning, for the Southern California Earthquake Center since 2007. His research focus is earthquake seismology, and in particular how to understand the physics of earthquakes from seismograms, and how to anticipate the strength and variability of shaking in earthquakes. He is a fellow of the American Geophysical Union and recipient of the EGU Gutenberg Medal in recognition of outstanding contributions in seismology.
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The following schedule is tentative:
Dr. Gregory C. Beroza, Geophysics Department, Stanford University: PREDICTING STRONG EARTHQUAKE SHAKING USING OCEAN WAVES
Dr. Adam Brandt, Department of Energy Resources Engineering, Stanford University: METHANE EMISSIONS FROM NORTH AMERICAN NATURAL GAS SYSTEMS: THE STATE OF THE SCIENCE
Dr. Mykel Kochenderfer, Stanford: Next-Generation Aircraft Collision Avoidance
Dr. Mike Irwin, Director of the Cambridge Astronomical Survey Unit: Survey data reduction
Dr. Katharine Mach, co-director of science for IPCC WGII. CLIMATE CHANGE IMPACTS, ADAPTATION, AND VULNERABILITY: THE NEW INTERNATIONAL ASSESSMENT
Dr. Fu-Kuo Chang, Stanford University: Structural Health Monitoring
Mr. Greg Edwards. Internet Design Decisions and Later Regrets
Mr. Ken Lum: The Evolution of the Reflector Telescope
Ms. Jennifer Gerlach, Valley Christian Schools: Developing a scientific mindset through research in the high school
Mr. Greg Edwards. Privacy and big data
NO COLLOQUIUM, Thanksgiving
Dr. Gary Bush, LM/STAR Labs: The Latest on High Speed Rail (Again!!)
NO COLLOQUIUM, Christmas
If you have any comments or suggestions for speakers, please call Dr. Gary Bush at (650) 424-2267 or Dr. Stuart McHugh at (650) 424-2561.
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