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SUMMARY:Earthquakes in a laboratory by squeezing a 3 m rock - Gregory C. M
 cLaskey\, School of Civil and Environmental Engineering Cornell University
DTSTART:20201016T140000Z
DTEND:20201016T150000Z
UID:TALK153133@talks.cam.ac.uk
CONTACT:Dr Maria Marques de Carvalho
DESCRIPTION:I\ndescribe sequences of magnitude 2 5 laboratory\nearthquakes
  generated on a 3 meter laboratory rock\nexperiment that provide insights 
 into how\nearthquakes begin and how earthquake ruptures\nstop The rock sam
 ple is instrumented with arrays of\nsensors including strain gages and\nul
 trasonic/acoustic emission sensors typically used\nfor nondestructive test
 ing or structural health\nmonitoring applications In the experiment\, we s
 lowly\nload the rock sample with up to 10 MN of force and\nwait for an ins
 tability — an earthquake — to\nspontaneously rupture the fault\, which
  is the\ninterface between two massive granite blocks Once\nthe earthquake
  initiates\, it ruptures as a shear crack\nthat propagates close to the sp
 eed of sound in the\ngranite 4 km/s) Unique to this large machine\, some\n
 laboratory earthquakes stop before rupturing through\nthe ends of the samp
 le\, and this allows us to study\nthe stress conditions required to stop a
 n earthquake\nrupture and the stress changes near the arrested\ncrack tip 
 The magnitude of the laboratory\nearthquakes is determined from the record
 ed\nvibrations by comparing them to the shock waves of\na ball impact with
  known momentum transfer We\nalso employ finite element models and boundar
 y\nintegral method simulations to assist with the\ninterpretation of the l
 aboratory rupture events
LOCATION:Zoom (email structures-admin@eng.cam.ac.uk for link)
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