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SUMMARY:Post-Seismic Deformation Following Deep Earthquakes - Sunny Park\,
  Caltech
DTSTART:20201111T160000Z
DTEND:20201111T170000Z
UID:TALK150892@talks.cam.ac.uk
CONTACT:Camilla Penney
DESCRIPTION:Observations of surface deformation caused by earthquakes prov
 ide insights into earthquake mechanisms and rheological structure.  So far
 \, geodetic observations have been mostly limited to shallow earthquakes s
 ince the amplitude of surface deformation from deep events is considered r
 elatively small.  In this talk\, I will show the detections of post-seismi
 c signals from deep earthquakes\, which open up new opportunities of under
 standing mantle viscosity and deep rupture processes.  We examine the GPS 
 data of one of the largest deep earthquakes ever recorded\, 2018 Mw 8.2 Fi
 ji earthquake which occurred at ~600-km depth.  Taking advantage of data p
 rocessing techniques such as independent component analyses\, we detect a 
 large scale post-seismic deformation that has been taking place for more t
 han one and half years.  I will discuss what we can learn about the viscos
 ity structure and the existence of afterslip from the overall directionali
 ty and amplitude of the post-seismic deformation.\n\nBackground reading:\n
 \nJiao et al.\, _Evidence for static displacements from the June 9\, 1994 
 Deep Bolivian Earthquake_\, GRL\, 1995\, "https://doi.org/10.1029/95GL0207
 1":URL \n\nEkstr&#246\;m\, Calculation of static deformation following the
  Bolivia Earthquake by summation of Earth's normal modes\, GRL\, 1995\, "h
 ttps://doi.org/10.1029/95GL01435":URL\n\n*This seminar will be held online
 . Zoom details will be sent to members of the Earth Sciences department vi
 a email. Please contact the organisers if you are outside the department a
 nd would like to attend*
LOCATION:ONLINE - Details to be sent by email
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