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Bedrock response to Llanquihue Holocene and present‐day glaciation in southernmost South America
Author(s) -
Ivins Erik R.,
James Thomas S.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021500
Subject(s) - geology , bedrock , post glacial rebound , holocene , glacier , glacial period , mantle (geology) , physical geography , geophysics , earth science , geodesy , geomorphology , paleontology , geography
Modern geodetic techniques, such as precise Global Positioning System (GPS) measurements and high resolution space gravity mapping, make it possible to measure the present‐day rate of viscoelastic gravitational Earth response to present and past glacier mass change. Patagonia is a rapidly evolving glacial environment. Over the past decade, the local rate of surface stress unloading may be the largest anywhere on the planet. We compute the present‐day land uplift rate that could be observed using bedrock GPS measurements. The Little Ice Age (LIA) of the past half millennium generates large vertical rates since the underlying mantle material is likely to have anomalously low viscosity owing to late‐Neogene ridge subduction.