EM122 Water Column Sonar Data Collected During AT26-04
Thermal Structure of the Cascadia Subduction Zone on the Washington Margin (AT26-04, EM122). We propose to conduct a comprehensive study of the thermal environment of the Cascadia Subduction Zone (CSZ) within the NSF GeoPRISM Corridor off the Washington margin. The primary goal of this study is to determine the temperature structure of Juan de Fuca basement and overlying accretionary prism sediments that comprise the CSZ deformation zone with a transect of systematic heat flow and fluid flux profiles off the Washington Coast. Temperature is a primary controlling factor of many subduction zone processes, particularly at active margins that are subject to large magnitude, megathrust earthquakes as the CSZ offshore WA, and a comprehensive heat flow study of the Cascadia Corridor is a fundamental parameter required by the Scientific Plan of the GeoPRISM Program. Compilation of existing data demonstrate that the segment of the CSZ off-shore WA is dramatically under-measured, with only sparse heat flow stations made during programs focused on other scientific goals. We are proposing to acquire a systematic profile of heat flow and fluid flux measurements along a corridor of the accretionary prism on the Washington margin at 47N, from west of the deformation front on the abyssal plain to just below the shelf edge at 500 m depth in order to make the first quantitative estimates of the thermal structure of the 'locked zone' of the Cascadia megathrust. To obtain an accurate estimate of conductive heat flux from the challenging environment of the accretionary prism, we plan redundant methods to obtain both thermal and fluid flux measurements along a 2.5 D profile of the margin at a single latitude. In this profile we would use thermal blankets suitable for impenetrable sub-stratum, continuous fluid flow meters, multi-core deployments for sediment pore water chemistry and thermal gradient measurements, and Jason-II heat flow probes.
Dataset Citation
- Cite as: Rolling Deck to Repository (R2R). 2013. 'EM122 Water Column Sonar Data Collected During AT26-04'. NOAA National Centers for Environmental Information. [access date]
Dataset Identifiers
- AT26-04_EM122
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:AT26-04_EM122
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:AT26-04_EM122
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Ordering Instructions | Contact the NCEI Water Column Sonar Data Manager to order data. |
Distributor |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Water Column Sonar Data Manager NOAA National Centers for Environmental Information (303) 497-4742 wcd.info@noaa.gov |
Time Period | 2013-07-31T22:03:46 to 2013-08-26T11:39:08 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -126.3831555
East: -124.1409777
South: 46.18900655
North: 46.85795125
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | Study the thermal environment of the Cascadia Subduction Zone (CSZ) within the NSF GeoPRISM Corridor off the Washington margin |
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International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
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Last Modified: 2020-06-03
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov