Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction
Magnetic and bathymetric profiles derived from the R/V Endeavor survey and focal mechanism studies for earthquakes on two of the Juan Fernandez microplate boundaries are analyzed. It is observed that the Nazca-Juan Fernandez pole is in the northern end of the microplate since the magnetic lineation...
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1986
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ftnasantrs:oai:casi.ntrs.nasa.gov:19860042057 2023-05-15T13:49:36+02:00 Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction Anderson-Fontana, S. Larson, R. L. Engein, J. F. Lundgren, P. Stein, S. Unclassified, Unlimited, Publicly available Feb 10, 1986 http://ntrs.nasa.gov/search.jsp?R=19860042057 unknown http://ntrs.nasa.gov/search.jsp?R=19860042057 Accession ID: 86A26795 Copyright Other Sources 46 Journal of Geophysical Research; 91; 2005-201 1986 ftnasantrs 2012-02-15T16:45:13Z Magnetic and bathymetric profiles derived from the R/V Endeavor survey and focal mechanism studies for earthquakes on two of the Juan Fernandez microplate boundaries are analyzed. It is observed that the Nazca-Juan Fernandez pole is in the northern end of the microplate since the magnetic lineation along the East Ridge of the microplate fans to the south. The calculation of the relative motion of the Juan Fernandez-Pacific-Nazca-Antarctic four-plate system using the algorithm of Minster et al. (1974) is described. The development of tectonic and evolutionary models of the region is examined. The tectonic model reveals that the northern boundary of the Juan Fernandez microplate is a zone of compression and that the West Ridge and southwestern boundary are spreading obliquely; the evolutionary model relates the formation of the Juan Fernandez microplate to differential spreading rates at the triple junction. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic Pacific Fernandez ENVELOPE(-62.233,-62.233,-63.250,-63.250) East Ridge ENVELOPE(-136.671,-136.671,63.833,63.833) West Ridge ENVELOPE(-137.021,-137.021,63.833,63.833) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
46 |
spellingShingle |
46 Anderson-Fontana, S. Larson, R. L. Engein, J. F. Lundgren, P. Stein, S. Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
topic_facet |
46 |
description |
Magnetic and bathymetric profiles derived from the R/V Endeavor survey and focal mechanism studies for earthquakes on two of the Juan Fernandez microplate boundaries are analyzed. It is observed that the Nazca-Juan Fernandez pole is in the northern end of the microplate since the magnetic lineation along the East Ridge of the microplate fans to the south. The calculation of the relative motion of the Juan Fernandez-Pacific-Nazca-Antarctic four-plate system using the algorithm of Minster et al. (1974) is described. The development of tectonic and evolutionary models of the region is examined. The tectonic model reveals that the northern boundary of the Juan Fernandez microplate is a zone of compression and that the West Ridge and southwestern boundary are spreading obliquely; the evolutionary model relates the formation of the Juan Fernandez microplate to differential spreading rates at the triple junction. |
format |
Other/Unknown Material |
author |
Anderson-Fontana, S. Larson, R. L. Engein, J. F. Lundgren, P. Stein, S. |
author_facet |
Anderson-Fontana, S. Larson, R. L. Engein, J. F. Lundgren, P. Stein, S. |
author_sort |
Anderson-Fontana, S. |
title |
Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
title_short |
Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
title_full |
Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
title_fullStr |
Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
title_full_unstemmed |
Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction |
title_sort |
tectonics and evolution of the juan fernandez microplate at the pacific-nazca-antarctic triple junction |
publishDate |
1986 |
url |
http://ntrs.nasa.gov/search.jsp?R=19860042057 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-62.233,-62.233,-63.250,-63.250) ENVELOPE(-136.671,-136.671,63.833,63.833) ENVELOPE(-137.021,-137.021,63.833,63.833) |
geographic |
Antarctic Pacific Fernandez East Ridge West Ridge |
geographic_facet |
Antarctic Pacific Fernandez East Ridge West Ridge |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19860042057 Accession ID: 86A26795 |
op_rights |
Copyright |
_version_ |
1766251847737147392 |