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Glacio-isostatic crustal movements caused by historical volume change of the Vatnajokull ice cap, IcelandMeasurements of the lake level of Lake Langisjor at the SW edge of the Vatnajokull ice cap indicate a tilt of 0.26 +/- 0.06 microrad/yr away from the ice cap in the years of 1959-1991. The tilt is too large to be explained as an elastic Earth response to ice retreat this century, or to be caused by change in the gravitational pull of the ice cap, but it can be explained by sub-lithospheric viscous adjustment. Regional subsidence in historical times in SE Iceland can similarly be attributed to viscous adjustment resulting from the increased load of Vatnajokull during the Little Ice Age. The inferred sublithospheric viscosity is 1 x 10 exp 18 - 5 x 10 exp 19 Pa s.
Document ID
19930032183
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sigmundsson, Freysteinn
(NASA Headquarters Washington, DC United States)
Einarsson, Pall
(Univ. of Iceland Reykjavik, United States)
Date Acquired
August 15, 2013
Publication Date
November 3, 1992
Publication Information
Publication: Geophysical Research Letters
Volume: 19
Issue: 21
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
93A16180
Distribution Limits
Public
Copyright
Other

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