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September 19 @ 4:00 pm - September 23 @ 5:00 pm CDT

Simulating Realistic Earthquake Ground Motions

Robert Graves

US Geological Survey

Pasadena, CA

 

Ground motion simulations are an important resource for augmenting recorded motions, assessing impacts for scenario earthquakes, and exploring parametric sensitivity. Providing confidence that simulations are realistic requires demonstrating that they not only reproduce motions from past earthquakes, but also that they can predict motions for future events. Ideally, simulations should capture effects due to complexities in the rupture process, as well as effects due to large-scale (e.g., basins) and small-scale (e.g., scattering or site effects) variations in the seismic velocity structure. Accounting for these features is challenging due to uncertainty in the expected ranges of the required parameters. Furthermore, adding increased detail to the model space increases the computational requirements. Simulation approaches have traditionally been classified as “deterministic” or “stochastic” depending on the level of complexity used to describe earthquake rupture and wave propagation effects. Because of knowledge limitations and computational cost, the deterministic approach is typically employed for lower frequencies (< 1 Hz) and the stochastic approach at higher frequencies (> 1Hz).  This distinction naturally leads to a hybrid approach, where the separate low- and high-frequency responses are combined to produce a broadband response. In my talk, I will describe the features behind the hybrid simulation approach along with examples of its application to model recorded earthquake ground motions. I will also describe refinements to the deterministic approach that extend its range of applicability to higher frequencies. Finally, I will summarize those cases where simulations are most beneficial and explore some frontiers scientists are facing in ground motion simulations.

Details

Start:
September 19 @ 4:00 pm
End:
September 23 @ 5:00 pm
Event Categories:
,

Venue

Duncan Hall
Rice University, 6100 Main Street
Houston, TX 77005 United States

Details

Start:
September 19 @ 4:00 pm
End:
September 23 @ 5:00 pm
Event Categories:
,

Venue

Duncan Hall
Rice University, 6100 Main Street
Houston, TX 77005 United States

For outside visitors, the best way to get to our department is to come in on Rice Blvd and turn into entrance 20 (intersection of Rice and Kent St.). At the stop sign, you will see a visitor parking lot.  From there, walk east to the department.  The google map below shows exactly where our building is.