Evaluation of feasibility of mapping seismically active faults in Alaska
The author has identified the following significant results. The sharp bend in the Alaska Range near 65 deg N, 150 deg W in now thought to enclose a corner of the northwesterly migrating north Pacific lithospheric plate. Subduction of the plate beneath the continent is believed, on the basis of hypo...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19730019688 2023-05-15T13:09:38+02:00 Evaluation of feasibility of mapping seismically active faults in Alaska Vanwormer, J. D. Gedney, L. D. Unclassified, Unlimited, Publicly available Jul 31, 1973 application/pdf http://hdl.handle.net/2060/19730019688 unknown Document ID: 19730019688 Accession ID: 73N28420 http://hdl.handle.net/2060/19730019688 No Copyright CASI GEOPHYSICS E73-10842 NASA-CR-133404 1973 ftnasantrs 2019-07-21T05:36:54Z The author has identified the following significant results. The sharp bend in the Alaska Range near 65 deg N, 150 deg W in now thought to enclose a corner of the northwesterly migrating north Pacific lithospheric plate. Subduction of the plate beneath the continent is believed, on the basis of hypocentral distribution, to occur along Cook Inlet and the eastern flanks of the Aleutian and Alaska Ranges as far northward as Mt. McKinley. The nature of tectonic deformation here, particularly in the area of the bend in the Alaska Range, is understandably complex. The Denali fault is thought to be a transform character in the vicinity of Mt. McKinley (i.e., it is thought to be the surface along which the oceanic plate separates from the continental plate). On the ERTS-1 imagery, however, it appears that there are a number of sub-parallel faults which branch off of the Denali fault in a southwesterly direction. Slippage along these would tend to squeeze material around the inside of the band rather than the plate being directly underthrust. All of these sub-parallel faults are seismically active. The right-lateral fault-plane solution obtained for this event is consistent with the concept of slippage around the bend on a set of sub-parallel faults in the manner postulated. The best images to show these features are 1066-20444 and 1266-20572. Other/Unknown Material alaska range Alaska NASA Technical Reports Server (NTRS) Pacific |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
GEOPHYSICS |
spellingShingle |
GEOPHYSICS Vanwormer, J. D. Gedney, L. D. Evaluation of feasibility of mapping seismically active faults in Alaska |
topic_facet |
GEOPHYSICS |
description |
The author has identified the following significant results. The sharp bend in the Alaska Range near 65 deg N, 150 deg W in now thought to enclose a corner of the northwesterly migrating north Pacific lithospheric plate. Subduction of the plate beneath the continent is believed, on the basis of hypocentral distribution, to occur along Cook Inlet and the eastern flanks of the Aleutian and Alaska Ranges as far northward as Mt. McKinley. The nature of tectonic deformation here, particularly in the area of the bend in the Alaska Range, is understandably complex. The Denali fault is thought to be a transform character in the vicinity of Mt. McKinley (i.e., it is thought to be the surface along which the oceanic plate separates from the continental plate). On the ERTS-1 imagery, however, it appears that there are a number of sub-parallel faults which branch off of the Denali fault in a southwesterly direction. Slippage along these would tend to squeeze material around the inside of the band rather than the plate being directly underthrust. All of these sub-parallel faults are seismically active. The right-lateral fault-plane solution obtained for this event is consistent with the concept of slippage around the bend on a set of sub-parallel faults in the manner postulated. The best images to show these features are 1066-20444 and 1266-20572. |
format |
Other/Unknown Material |
author |
Vanwormer, J. D. Gedney, L. D. |
author_facet |
Vanwormer, J. D. Gedney, L. D. |
author_sort |
Vanwormer, J. D. |
title |
Evaluation of feasibility of mapping seismically active faults in Alaska |
title_short |
Evaluation of feasibility of mapping seismically active faults in Alaska |
title_full |
Evaluation of feasibility of mapping seismically active faults in Alaska |
title_fullStr |
Evaluation of feasibility of mapping seismically active faults in Alaska |
title_full_unstemmed |
Evaluation of feasibility of mapping seismically active faults in Alaska |
title_sort |
evaluation of feasibility of mapping seismically active faults in alaska |
publishDate |
1973 |
url |
http://hdl.handle.net/2060/19730019688 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
alaska range Alaska |
genre_facet |
alaska range Alaska |
op_source |
CASI |
op_relation |
Document ID: 19730019688 Accession ID: 73N28420 http://hdl.handle.net/2060/19730019688 |
op_rights |
No Copyright |
_version_ |
1766190965094088704 |