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A 12,000-year record of vertical deformation across the Yellowstone caldera margin: The shorelines of Yellowstone LakeThe 600 ka Yellowstone caldera exhibits several signs of unrest, the most evident of which is historic ground deformation including both uplift and subsidence. We document deformation in the area of the southern caldera across approximately 12,000 years using the postglactic shoreline terraces of Yellowstone Lake. Raised shoreline elevations were interpreted from 230 leveling profiles surveyed across flights of terraces, with an accuracy of +/- 0.5 m. Of about 11 recognizable terraces, the five most continuous raised shorelines were correlated around the lake basin to reveal deformation patterns. Net deformation over the past approximatley 3 kyr has been dominantly up within the caldera interior and slightly down along the caldera rim, relative to the extracaldera region. This uplift is roughly similar to the historic pattern and may largely represent the effects of the most recent inflation episode. Subtraction of the total estimated magnitude of inflation in this epsiode suggests that the overall trend of postglacial deformation has been subsidence. The cause of this trend is undetermined but is most likely related to the effects of regional extension and long-term cooling within the Yellowstone caldera.
Document ID
19950054981
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Locke, William W.
(Montana State Univ. Bozeman, MT, United States)
Meyer, Grant A.
(Montana State Univ. Bozeman, MT, United States)
Date Acquired
August 16, 2013
Publication Date
October 10, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: B10
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A86580
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-18321
CONTRACT_GRANT: NSF EAR-88-04831
Distribution Limits
Public
Copyright
Other

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