Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic
A new application of an old technique to study the Earth?s interior is allowing us to see stratification in the ocean, providing a new insight into oceanic structure and mixing processes. The new adaptation of seismic reflection profiling can create detailed pictures of eddies, internal waves, and o...
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Trinity College (Dublin, Ireland). Department of Geology
2012
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fttrinitycoll:oai:tara.tcd.ie:2262/78222 2023-05-15T17:35:41+02:00 Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic Sutton, Ciaran 2012 1 volume pp 326 http://hdl.handle.net/2262/78222 en eng Trinity College (Dublin, Ireland). Department of Geology http://stella.catalogue.tcd.ie/iii/encore/record/C__Rb15647952 Ciaran Sutton, 'Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic', [thesis], Trinity College (Dublin, Ireland). Department of Geology, 2012, pp 326 THESIS 10270 http://hdl.handle.net/2262/78222 openAccess Geology Ph.D Ph.D. Trinity College Dublin thesis thesis_dissertations refereed_publications Doctoral Doctor of Philosophy (Ph.D.) 2012 fttrinitycoll 2020-02-16T13:56:22Z A new application of an old technique to study the Earth?s interior is allowing us to see stratification in the ocean, providing a new insight into oceanic structure and mixing processes. The new adaptation of seismic reflection profiling can create detailed pictures of eddies, internal waves, and other oceanic features that affect climate, fisheries and the spread of pollution. This thesis focuses on the Rockall Trough area off the west coast of Ireland, in which reprocessed profiles show a seismically bright reflective region at depth in the sea. Structures are observed within these layers including dipping reflectors close to the slope, eddy like features and undulations within reflectors that represent internal waves. Seismic reflection sections provide very high resolution images of the oceans structure, both vertical and, in particular, horizontal, and complement conventional physical oceanography data. Seismic sections across Rockall Trough show strong lateral variability in reflectivity within the North Atlantic Central Water and Mediterranean Outflow Water (MOW) layers. As a result the reflections between adjacent or intersecting sail lines are often offset. Hence, from an oil industry perspective, there may be problems in suppressing multiples from water layer reverberations. When processing seismic surveys of regions of high oceanic variability, it is necessary to use procedures that can solve for and then remove the effect of significant fluctuations in water layer sound speed over time periods as short as a few hours and distances as short as a kilometre. TARA (Trinity?s Access to Research Archive) has a robust takedown policy. Please contact us if you have any concerns: rssadmin@tcd.ie Doctoral or Postdoctoral Thesis North Atlantic The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) |
institution |
Open Polar |
collection |
The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) |
op_collection_id |
fttrinitycoll |
language |
English |
topic |
Geology Ph.D Ph.D. Trinity College Dublin |
spellingShingle |
Geology Ph.D Ph.D. Trinity College Dublin Sutton, Ciaran Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
topic_facet |
Geology Ph.D Ph.D. Trinity College Dublin |
description |
A new application of an old technique to study the Earth?s interior is allowing us to see stratification in the ocean, providing a new insight into oceanic structure and mixing processes. The new adaptation of seismic reflection profiling can create detailed pictures of eddies, internal waves, and other oceanic features that affect climate, fisheries and the spread of pollution. This thesis focuses on the Rockall Trough area off the west coast of Ireland, in which reprocessed profiles show a seismically bright reflective region at depth in the sea. Structures are observed within these layers including dipping reflectors close to the slope, eddy like features and undulations within reflectors that represent internal waves. Seismic reflection sections provide very high resolution images of the oceans structure, both vertical and, in particular, horizontal, and complement conventional physical oceanography data. Seismic sections across Rockall Trough show strong lateral variability in reflectivity within the North Atlantic Central Water and Mediterranean Outflow Water (MOW) layers. As a result the reflections between adjacent or intersecting sail lines are often offset. Hence, from an oil industry perspective, there may be problems in suppressing multiples from water layer reverberations. When processing seismic surveys of regions of high oceanic variability, it is necessary to use procedures that can solve for and then remove the effect of significant fluctuations in water layer sound speed over time periods as short as a few hours and distances as short as a kilometre. TARA (Trinity?s Access to Research Archive) has a robust takedown policy. Please contact us if you have any concerns: rssadmin@tcd.ie |
format |
Doctoral or Postdoctoral Thesis |
author |
Sutton, Ciaran |
author_facet |
Sutton, Ciaran |
author_sort |
Sutton, Ciaran |
title |
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
title_short |
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
title_full |
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
title_fullStr |
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
title_full_unstemmed |
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic |
title_sort |
acoustic imaging of variable water layer structure in rockall trough, ne atlantic |
publisher |
Trinity College (Dublin, Ireland). Department of Geology |
publishDate |
2012 |
url |
http://hdl.handle.net/2262/78222 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://stella.catalogue.tcd.ie/iii/encore/record/C__Rb15647952 Ciaran Sutton, 'Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic', [thesis], Trinity College (Dublin, Ireland). Department of Geology, 2012, pp 326 THESIS 10270 http://hdl.handle.net/2262/78222 |
op_rights |
openAccess |
_version_ |
1766134938200965120 |