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UID:5400
LOCATION:Virtual
DTSTAMP:20180221T140000
DTSTART:20180221T140000
DTEND:20180221T150000
SUMMARY:WEBINAR: Glacial Earthquakes and Cryoseismology
DESCRIPTION:Please register for Glacial Earthquakes and Cryoseismology 
 as a Tool for Investigating Greenland Outlet Glaciers on F
 ebruary 21\, 2018 2:00 PM EST at: \n\nhttps://attendee.gotowe
 binar.com/register/2505810477443022081\n\nPresenter: Dr. Step
 hen A. Veitch\, University of Texas at El Paso \n\nAbstract: 
 Although seismology has been used as a tool to investigate g
 laciers and icesheets for decades\, the field of 'Cryoseismol
 ogy' has exploded in the last decade with the development of
  new tools and techniques that have helped to facilitate the
  growth of the field. In this talk we will cover ongoing and
  published research from Greenland involving both locally an
 d globally recorded seismograms. The loss of ice from the Gr
 eenland ice sheet is an important contributor to current and
  future sea level rise occurring due to ongoing changes in t
 he global climate. A significant portion of this ice mass lo
 ss comes through the calving of large icebergs at Greenland'
 s many marine-terminating outlet glaciers. However\, the dyna
 mics of calving at these glaciers is currently not well unde
 rstood\, complicating projections of future behaviour of thes
 e glaciers and mass loss from the Greenland ice sheet. \n\nOn
  the global scale\, data from the long-standing global seismi
 c network has recorded the occurrence of glacial earthquakes
 \, large long period earthquakes that occur during large calv
 ing events at near-grounded outlet glaciers.  The occurrenc
 e and source parameters of these earthquakes provide insight
  into the link between glacier calving and climatic and ocea
 nic forcings\, as well as information on the large-scale glac
 ier-dynamic conditions under which these major calving event
 s occur. On the more local scale\, a deployment of seismomete
 rs around an individual glacier has provided insights on the
  seismic environment of a calving glacier\, as well as the mo
 re immediate\, short-term external drivers of calving events.
  We consider both local and global seismic data in order to 
 further understanding of the dynamics of the calving process
  at Greenland outlet glaciers\, and find that glacial earthqu
 ake production is indicative of a near-grounded terminus at 
 the source glacier. We find that the locations derived from 
 these events are accurate and are sensitive to changes in th
 e calving-front position of the source glacier\, and that the
  active-force azimuths are representative of the orientation
  of the glacier at the time of calving. We also find that th
 ese glaciers are the source of abundant small icequakes\, whi
 ch are strongly tied to the occurrence of major calving even
 ts. The small icequakes that occur at Helheim glacier are mo
 dulated by semi-diurnal variations in tide height\, and poten
 tially control the timing of major calving events by progres
 sively damaging the glacier tongue.\n\n \n\nAfter registering\, 
 you will receive a confirmation email containing information
  about joining the webinar. PLEASE NOTE: Registration does 
 not confirm or guarantee you will have a spot during the web
 inar\, as we are limited to 500 participants. Please hop on 
 the webinar early for your best chances to see the webinar l
 ive. Remember that all IRIS webinars are archived for later
  viewing at https://www.youtube.com/playlist?list=PLD4D60
 7C2FA317E6D
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