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SUMMARY:Mechanics of spontaneously arrested laboratory earthquakes
DTSTART:20211014T160000
DTEND:20211014T170000
DTSTAMP:20260916T003929Z
UID:95710fe8e62233ec2d22fe6baa362151083eb53b843a0177b5be2667
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. David Kammer Computational Mechanics of Building Materia
 ls\, ETH Zurich\nAbstract: Earthquakes\, which we experience as ground sha
 king\, consist of sudden relative motion between tectonic plates. The unde
 rlying mechanical process involves three phases – the initiation of loca
 l slip\, its growth along the tectonic fault\, and its arrest. This ruptur
 e-like process is governed by physics at multiple length scales\, making i
 t a highly complex phenomenon that remains only partially understood. This
  is particularly true for earthquake arrest\, which directly affects its m
 agnitude. The current understanding of earthquake arrest is almost exclusi
 vely based on remote measurements because most laboratory experiments are 
 too small to allow rupture arrest to occur naturally. However\, recently d
 eveloped large-scale laboratory experiments on granite blocks provide the 
 necessary fault length to generate laboratory earthquake ruptures that not
  only nucleate and propagate\, but also arrest\, spontaneously. These expe
 riments provide an opportunity to reexamine and better understand the phys
 ics governing earthquake arrest conditions. In this talk\, we will discuss
  various analytical and numerical models that enable in-depth analysis\, i
 nterpretation and extrapolation of results from such large-scale laborator
 y earthquake experiments. The results suggest that rupture arrest (at leas
 t in the laboratory) is controlled by the driving force rather than by the
  resistance\, as often assumed. Further\, we will discuss fault fracture e
 nergy\, which is a key parameter in the arrest of earthquake ruptures. We 
 will present a minimal numerical model with scale-invariant fault fracture
  energy in accordance with laboratory observations. However\, when applyin
 g seismological approaches to estimate the fault fracture energy\, it appe
 ars to be scale-dependent\, similar to field observations\, despite being 
 scale-invariant. Therefore\, the model reconciles conflicting observations
  from the field and the laboratory\, and provides a pathway for more reali
 stic models of earthquake arrest mechanisms.
LOCATION:http://swissmechseminars.ch https://ethz.zoom.us/j/94817809233?pw
 d=N0pzbnQwSFFTQnVPcVR3SkNrd29OQT09
STATUS:CONFIRMED
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