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TitleBedrock response to Llanquihue Holocene and present-day glaciation in southernmost South America
AuthorIvins, E R; James, T SORCID logo
SourceGeophysical Research Letters vol. 31, no. 24, L24613, 2004, 4 pages, Open Access logo Open Access
Alt SeriesGeological Survey of Canada, Contribution Series 2004227
Mediapaper; on-line; digital
File formatpdf
Areasouthern South America; Puerto Guadal; Villa O'Higgins; Punta del Lago; Puerto Coig; Puerto natales; Chile Chico; El Calafete; Ushuaia; Chile; Argentina
Lat/Long WENS -75.0000 -65.0000 -45.0000 -56.0000
Subjectsgeophysics; surficial geology/geomorphology; tectonics; glaciology; glacial history; deglaciation; glaciers; crustal uplift; glacial tectonics; isostasy; isostatic rebound; rheology; lithosphere; crustal thickness; mantle; viscosity; geodesy; Holocene; Pleistocene; Neogene; Little Ice Age; Phanerozoic; Cenozoic; Quaternary
Illustrationsgraphs; sketch maps
ProgramNatural Hazards and Emergency Response
Released2004 01 01
AbstractModern 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.

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