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Seafloor geodetic measurements and m...

Gagnon, Katie L.

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Seafloor geodetic measurements and modeling of Nazca - South America plate convergence.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Seafloor geodetic measurements and modeling of Nazca - South America plate convergence./
Author:	Gagnon, Katie L.
Description:	158 p.
Notes:	Adviser: C. David Chadwell.
Contained By:	Dissertation Abstracts International69-04B.
Subject:	Geodesy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3310010
ISBN:	9780549584049

Seafloor geodetic measurements and modeling of Nazca - South America plate convergence.
Gagnon, Katie L.

Seafloor geodetic measurements and modeling of Nazca - South America plate convergence. - 158 p.

Adviser: C. David Chadwell.

Thesis (Ph.D.)--University of California, San Diego, 2007.

Campaign geodetic observations demonstrate shallow, interplate coupling along the thrust fault between the converging oceanic Nazca and continental South American plates. Delimiting the width of the seismogenic zone contributes to our understanding of the seismic and tsunamigenic nature of convergent plate boundaries. Here we locate the updip limit of the seismogenic zone using a combination of the Global Positioning System (GPS) and acoustic travel time measurements. Two seafloor transponder arrays were positioned in 2001 and 2003, providing plate motion vectors 20 and 50 km landward of the Peru-Chile trench axis at 12°S. Over 100 hours of GPS, acoustic and sound speed profiling data were gathered at each array, in each epoch, providing an estimate of plate motion with an uncertainty on the order of millimeters. I describe each component of the GPS-acoustic technique (GPSA), including static and kinematic GPS, GPS antenna-hydrophone baseline surveys, acoustic travel time measurements, sound speed profiling and moving surveys to determine a priori transponder position. Comparing these geodetic measurements with three dimensional kinematic models reveals coupling at less than 2 km depth. Seismic records, thermal models, and topographic analyses suggest that GPSA array displacements represent shallow, elastic strain accumulation.

ISBN: 9780549584049Subjects--Topical Terms:

550741
Geodesy.

Seafloor geodetic measurements and modeling of Nazca - South America plate convergence.
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020 $a 9780549584049
035 $a (UMI)AAI3310010
035 $a AAI3310010
040 $a UMI $c UMI
100 1 $a Gagnon, Katie L. $3 1264094
245 1 0 $a Seafloor geodetic measurements and modeling of Nazca - South America plate convergence.
300 $a 158 p.
500 $a Adviser: C. David Chadwell.
500 $a Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2178.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2007.
520 $a Campaign geodetic observations demonstrate shallow, interplate coupling along the thrust fault between the converging oceanic Nazca and continental South American plates. Delimiting the width of the seismogenic zone contributes to our understanding of the seismic and tsunamigenic nature of convergent plate boundaries. Here we locate the updip limit of the seismogenic zone using a combination of the Global Positioning System (GPS) and acoustic travel time measurements. Two seafloor transponder arrays were positioned in 2001 and 2003, providing plate motion vectors 20 and 50 km landward of the Peru-Chile trench axis at 12°S. Over 100 hours of GPS, acoustic and sound speed profiling data were gathered at each array, in each epoch, providing an estimate of plate motion with an uncertainty on the order of millimeters. I describe each component of the GPS-acoustic technique (GPSA), including static and kinematic GPS, GPS antenna-hydrophone baseline surveys, acoustic travel time measurements, sound speed profiling and moving surveys to determine a priori transponder position. Comparing these geodetic measurements with three dimensional kinematic models reveals coupling at less than 2 km depth. Seismic records, thermal models, and topographic analyses suggest that GPSA array displacements represent shallow, elastic strain accumulation.
520 $a Transponder relocation, another key component of this technique, consists of surveying a replacement transponder in the event that a transponder be comes inactive. I discuss the methodology and results of a transponder relocation, which contributed +/-19 mm uncertainty to the final array vector. Optimal survey network geometry for a transponder relocation was determined in a simulation of the least-squares adjustment. Future relocations could decrease the contribution to array uncertainty to +/-10 mm with improved survey geometry. Finally, complimentary investigations such as long-baseline kinematic GPS, transponder depth measurements and near-bottom acoustic surveys are included as necessary asides for the development seafloor geodetic observations.
590 $a School code: 0033.
650 4 $a Geodesy. $3 550741
650 4 $a Geology. $3 516570
650 4 $a Geotechnology. $3 1018558
690 $a 0370
690 $a 0372
690 $a 0428
710 2 $a University of California, San Diego. $b Oceanography. $3 1019111
773 0 $t Dissertation Abstracts International $g 69-04B.
790 $a 0033
790 1 0 $a Brown, Kevin $e committee member
790 1 0 $a Chadwell, C. David, $e advisor
790 1 0 $a Hildebrand, John $e committee member
790 1 0 $a Hutchinson, Tara $e committee member
790 1 0 $a Lonsdale, Peter $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3310010