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Evaluation of feasibility of mapping seismically active faults in AlaskaThe author has identified the following significant results. The Yukon-Tanana uplands north and east of Fairbanks appear, on ERTS-1 imagery, to be composed of a number of large-scale (approximately 100 kilometers square) crustal blocks. The boundaries of these blocks appear to be defined by a number of northeast-striking lineaments which form the major river valleys of the area. Principal among these are the valleys of the Salcha River, the Cehan River, and the Chatanika River. These lineaments are all seismically active, and are thus presumed to be faults. This parallel set of lineaments appears to be intersected at various angles by a secondary set of faults trending generally north to south. The larger earthquakes in the area occur at the intersections of the two sets. It appears that seismicity of this part of Alaska may be conceptually represented by the grinding together of rigid blocks, with earthquakes occurring along their common boundaries and at the intersections where three or more blocks come in contact.
Document ID
19730011640
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gedney, L. D. (Alaska Univ. Fairbanks, AK, United States)
Date Acquired
September 2, 2013
Publication Date
March 31, 1973
Subject Category
Geophysics
Report/Patent Number
E73-10405
BMPR-4
NASA-CR-131141
Accession Number
73N20367
Funding Number(s)
CONTRACT_GRANT: NAS5-21833
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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