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SUMMARY:Why Do Earthquakes Cause Damage? - Victor Tsai - Brown University
DTSTART:20230125T150000Z
DTEND:20230125T160000Z
UID:TALK195205@talks.cam.ac.uk
CONTACT:Lisanne Jagt
DESCRIPTION:Why do earthquakes damage buildings? Many buildings are damage
 d most heavily by high-frequency ground motion rather than longer period s
 haking. Despite the importance of these high-frequency ground motions\, mo
 st frictional models for earthquakes generally underpredict how strong the
 y are\, even when heterogeneous friction and realistic roughness are accou
 nted for. In this talk\, I discuss the role of complex fault zones in gene
 rating high-frequency ground motions\, with a focus on the potential role 
 of collisions of structures as they attempt to slide past each other durin
 g an earthquake. Interestingly\, the ground motion from collisions depends
  mostly on the size and shape of the structures and does not depend on the
  magnitude of stresses within the Earth and thus gives a very different in
 terpretation of what causes the most damaging ground motions. When incorpo
 rated with standard frictional models\, the collision model explains vario
 us observations that are otherwise difficult to explain\, including why st
 ress drops sometimes are not observed to be magnitude invariant\, why faul
 t zones with more complexity have stronger ground motions\, and why high-f
 requency radiation patterns are more isotropic than can be explained by sc
 attering.
LOCATION:Wolfson Lecture Theatre (virtual)
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