MGL111 Chirp - US Extended Continental Shelf Project: Bering Sea CHIRP High-Resolution Seismic Profile Data

The Knudsen 2620 acquired sub-bottom profiles continuously throughout the cruise. The Knudsen was operated in 3.5 kHz Chirp mode, emitting a 1.5 kHz to 5 kHz (3 kHz bandwidth centered on 3.5 kHz) pulse from transducers mounted in the pod beneath the hull. A record window of 100 or 200 meters and assumed sound velocity of 1500 m/s remained constant through the cruise, except for areas where topographic variation dictated a greater than 200 meter record window. The resulting data records were 131 or 261 msec long, with a sample interval 0.038 msec. The ping rate varied over the course of the cruise, generally between 4 and 6 seconds.
  • Cite as: Dr. Ginger Barth. 2011: MGL111 Chirp - US Extended Continental Shelf Project: Bering Sea CHIRP High-Resolution Seismic Profile Data. NOAA National Centers for Environmental Information. Accessed [date].
  • NCEI Metadata ID: gov.noaa.ngdc.mgg.seismic:MGL1111_SubbottomProfiler
gov.noaa.ngdc.mgg.seismic:MGL1111_SubbottomProfiler
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Distribution Formats
  • Raw Knudsen SEG-Y Datagram
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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 Jennifer Jencks
NOAA National Centers for Environmental Information
303 497-6419
Jennifer.Jencks@noaa.gov
Time Period 2011-08-08 to 2011-09-02
Spatial Reference System urn:ogc:def:crs:EPSG::4326urn:ogc:def:crs:EPSG::5831
Spatial Bounding Box Coordinates
West:174.12081
East:-166.47889
South:53.89308
North:58.82082
Spatial Coverage Map
General Documentation
Associated Resources
  • MGL1111
Publication Dates
  • publication: 2011-08-08
Dataset Progress Status Status not available
Data Update Frequency Data update frequency not available
Purpose The purpose of this field program was to determine sediment thickness, sedimentary architecture and velocity structure, and basement structure in support of requirements for continental shelf maritime zone definition in the Bering Sea. The program was focused on the velocity structure of the sedimentary fill in the central Aleutian basin, and the structures and processes that control variability in that velocity profile, including the influence of basement structure and the distribution of natural gas and hydrate charged sediments. The survey primarily explored the region of the central donut hole of international waters in the deep Aleutian basin, and included some coverage southward into the US EEZ approaching Bowers ridge.
Dataset Citation
  • Cite as: Dr. Ginger Barth. 2011: MGL111 Chirp - US Extended Continental Shelf Project: Bering Sea CHIRP High-Resolution Seismic Profile Data. NOAA National Centers for Environmental Information. Accessed [date].
Cited Authors
  • Dr. Ginger Barth
    United States Geological Survey
Publishers
  • NOAA National Centers for Environmental Information
Theme keywords ProcessedMethod Keywords
  • Seismic:Reflection
ProcessedDataClass Keywords
  • Other
Global Change Master Directory (GCMD) Service Keywords
  • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
  • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
  • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • UNH/CCOM-JHC > Center for Coastal and Ocean Mapping - Joint Hydrographic Center, University of New Hampshire
Place keywords
  • [1495] Bowers Ridge
  • [1494] Shirshov Ridge
  • [1493] Aleutian Basin
Keywords DataType Keywords
  • Seismic:Active:Subbottom
Keywords SeismicDataProvenance Keywords
  • DigitalSeg:DigitallyAcquired
Use Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
  • open
Other Constraints Cite as: Dr. Ginger Barth. 2011: MGL111 Chirp - US Extended Continental Shelf Project: Bering Sea CHIRP High-Resolution Seismic Profile Data. NOAA National Centers for Environmental Information. Accessed [date].
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for:dataset
Lineage Statement Data Quality: The Knudsen operated continuously through the entire cruise except for OBS deployment and recovery stations when pinger systems were secured. Several data gaps occurred (on MCS lines 2,7 and 9) when the system stopped recording .segy format ¿ this missing data is recorded in the kea- keb format files.
Lineage information for:repository
Processing Steps
  • 2015-04-22T00:00:00 -NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Acquisition Information (collection)
Instrument
  • Knudsen 2620
  • Kongsberg EM122
Platform
  • Marcus G. Langseth
Last Modified: 2020-05-07
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