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Neotectonic analysis of Upper Klamath Lake, Oregon; new insights from seismic reflection data

Lee M. Liberty, Thomas L. Pratt, Mitchell Lyle and Ian P. Madin
Neotectonic analysis of Upper Klamath Lake, Oregon; new insights from seismic reflection data (in Late Cenozoic structure and evolution of the Great Basin-Sierra Nevada transition, John S. Oldow (editor) and Patricia H. Cashman (editor))
Special Paper - Geological Society of America (2009) 447: 71-82

Abstract

We present marine high-resolution seismic reflection data from Upper Klamath Lake, Oregon, to discern the underlying structure and estimate Quaternary slip rates in this actively extending Basin and Range system. The sediment patterns and structures imaged on our seismic profiles reveal a complex geologic system that reflects a changing climate record, shallow water conditions, growth faulting, contrasting sediment sources, and high slip rates. We observe that Upper Klamath Lake is a sediment-saturated environment, and sediment accumulation rates are therefore controlled by basin subsidence rather than sediment supply. Published slip rates for Holocene extension are greater than our determined late Quaternary slip rates, assuming reasonable rates of deposition. The apparent increased Holocene fault-slip rates may be in part an artifact of long recurrence intervals between major earthquakes, with recent seismicity accommodating long-term strain. The quantity of observed faults below the lake is at least an order of magnitude greater than those mapped outside the lake, suggesting that many hidden faults throughout the region may be unaccounted for when estimating Basin and Range extension rates.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 447
Title: Neotectonic analysis of Upper Klamath Lake, Oregon; new insights from seismic reflection data
Title: Late Cenozoic structure and evolution of the Great Basin-Sierra Nevada transition
Author(s): Liberty, Lee M.Pratt, Thomas L.Lyle, MitchellMadin, Ian P.
Author(s): Oldow, John S.editor
Author(s): Cashman, Patricia H.editor
Affiliation: Boise State University, Center for Geophysical Investigation of the Shallow Subsurface, Boise, ID, United States
Affiliation: University of Texas at Dallas, Department of Geosciences, Richardson, TX, United States
Pages: 71-82
Published: 2009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2009-079377
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch map
N42°10'00" - N42°30'00", W122°04'60" - W121°45'00"
Secondary Affiliation: University of Nevada, USA, United StatesUniversity of Washington, USA, United StatesTexas A&M University, USA, United StatesOregon Department of Geology and Mineral Industries, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200942
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