Using Shear Waves to Characterize a Firn Aquifer on the Helheim Glacier in Southeast Greenland

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dc.contributor.advisorSchmerr, Nicholas C.en_US
dc.contributor.authorGuandique, Jonathan Alexanderen_US
dc.contributor.departmentGeologyen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2019-09-26T05:36:27Z
dc.date.available2019-09-26T05:36:27Z
dc.date.issued2019en_US
dc.description.abstractThe Greenland ice sheet is melting at an accelerating rate due to increasing global average temperatures. Ice penetrating radar surveys and ice cores extracted from the southeastern margin of the Greenland ice sheet near Helheim glacier discovered that a liquid water aquifer has formed within the near surface recrystallized and compacted snow (firn). Here we use active source seismology to probe the structure of this aquifer in the firn, and present results from a joint inversion technique that uses S-waves, P-waves, and surface waves to constrain the attenuation and seismic velocities that inform on the liquid water stored within the aquifer. Confirming past studies, we find that the aquifer lies at 27.9 +/- 3.5 m and has an approximate thickness of 10 +/- 4 m. We determine there is 1565 +/- 769 kg m-2 of water within the aquifer, a downward revision from past studies. Our study of S-waves and surface waves identified a complex structure in the aquifer layer and future work must incorporate full waveform modeling to use these waves for understanding firn aquifers.en_US
dc.identifierhttps://doi.org/10.13016/x8yc-cs6x
dc.identifier.urihttp://hdl.handle.net/1903/24966
dc.language.isoenen_US
dc.subject.pqcontrolledGeologyen_US
dc.subject.pquncontrolledAquiferen_US
dc.subject.pquncontrolledFirnen_US
dc.subject.pquncontrolledGreenlanden_US
dc.subject.pquncontrolledSeismologyen_US
dc.titleUsing Shear Waves to Characterize a Firn Aquifer on the Helheim Glacier in Southeast Greenlanden_US
dc.typeThesisen_US

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