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Geophysics Seminar: Sunyoung (Sunny) Park, Harvard University

April 17, 2018 @ 4:00 pm - 5:00 pm

Title: Right Under Your Feet − A Novel Approach to Constrain Near-Surface P- and S-Wave Speeds Based on Body-Wave Polarization


Near-surface seismic structure is crucial in assessing earthquake hazards,
since it is directly related to the level of ground shaking. Constraining
the near-surface structure, however, is challenging, especially in the
environments where drilling or field experiments using vibro-trucks or
explosives are not practical options. Here, we introduce a new non-invasive
technique to obtain near-surface seismic wave speeds based on the fact that
the wave speed immediately beneath a seismometer controls the recorded
orientations of arriving seismic waves. The technique is applied to
High-Sensitivity Seismograph Network in Japan to generate a map of
near-surface compressional and shear wave speeds. The lateral variations in
wave speeds correlate with geological and physical features such as
topography and volcanoes. This technique requires minimal computation
resources, and opens a new path to study the shallowest (~100 m) crustal
structures non-invasively and inexpensively. It can also be expanded in the
depth dimension by examining the frequency dependence and in the time
dimension by analyzing earthquakes from different time periods.


April 17, 2018
4:00 pm - 5:00 pm
Event Category:


ES 2093
22 Russell ST
Toronto, ON, M5S 3B1