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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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
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
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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. |
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Keywords | SeismicDataProvenance Keywords
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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]. |
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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. |
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Last Modified: 2020-05-07
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