MGL1109 Chirp - US Extended Continental Shelf Project: Gulf of Alaska CHIRP High-Resolution Seismic Profile Data
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title: MGL1109 Chirp - US Extended Continental Shelf Project: Gulf of Alaska CHIRP High-Resolution Seismic Profile Data
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date: 2011-06-07
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individualName: Dr. Ginger Barth
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abstract: 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 200 meters and assumed sound velocity of 1500 m/s remained constant through the cruise. The resulting data records were 267 msec long, with a sample interval 0.16667 msec (6 kHz). The ping rate varied over the course of the cruise. For most of the first two weeks, the ping rate was approximately 5 seconds. On or about June 23, the ping rate was increased to approximately 2 seconds.
purpose: The purpose of this field program was to determine sediment thickness and velocity structure, stratigraphic architecture, and basement structure of the North Pacific seafloor in support of requirements for continental shelf maritime zone definition in the Gulf of Alaska. The program was focused on the geologic structures and dynamic processes that control the distribution of sediment, including the manner in which the processes of the slope meet the deep sea floor, and the places where sediment is thickest due to the coincidence of basement depressions and abundant sediment supply. The survey explored portions of the Surveyor and Baranof sedimentary systems, the Aja Fracture Zone and the Kodiak Bowie seamount corridor.
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keyword: Seismic:Active:Subbottom
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date: 2009-12-01
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keyword: [1137] Gulf of Alaska
keyword: [1139] Aja Fracture Zone
keyword: [1141] Surveyor Fan
keyword: [1140] Kodiak Bowie Seamount Corridor
keyword: [1138] Baranof Fan
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keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
keyword: UNH/CCOM-JHC > Center for Coastal and Ocean Mapping - Joint Hydrographic Center, University of New Hampshire
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title: Global Change Master Directory (GCMD) Data Center Keywords
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date: 2020-01-09
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otherConstraints: 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.
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otherConstraints: Cite as: Dr. Ginger Barth. 2011: MGL1109 Chirp - US Extended Continental Shelf Project: Gulf of Alaska CHIRP High-Resolution Seismic Profile Data. NOAA National Centers for Environmental Information. Accessed [date].
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abstract: The Marine Trackline Geophysics database contains bathymetry, magnetics, gravity and seismic navigation data collected during marine cruises from 1939 to the present. Coverage is worldwide. Data sources include both US and foreign oceanographic institutions and government agencies. This map service shows tracks (both ship and airborne) for all geophysical surveys in the database, split into sub-layers by data type. This dynamic map service allows these sub-layers to be toggled on/off: All Survey Types (0) - visible by default; Bathymetry (1); Gravity (2); Magnetics (3); Multi-Channel Seismics (4); Seismic Refraction (5); Shot-Point Navigation (6); Side Scan Sonar (7); Single-Channel Seismics (8); Subbottom Profile (9); Aeromagnetic Surveys (10). Separate cached (tiled) map services are also available for several of these layers: All Survey Types (https://noaa.maps.arcgis.com/home/item.html?id=589adaec19ba48a9942ca9b13000c46d), Bathymetry (https://noaa.maps.arcgis.com/home/item.html?id=09dba3b48e8b49f4bcbf21f6e51ef6ed), Gravity (https://noaa.maps.arcgis.com/home/item.html?id=00cb8aa7607b4f11b78ef5a0e77921f5), Magnetics (https://noaa.maps.arcgis.com/home/item.html?id=09d6cfa8909545ddbfe93657ad761222), and Single-Channel Seismics (https://noaa.maps.arcgis.com/home/item.html?id=ff835a5df139428f992a6066151ffdda).
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useLimitation: These data not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For official navigation products, please refer to the U.S. nautical charts available from the NOAA Office of Coast Survey: http://www.nauticalcharts.noaa.gov.
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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.
orderingInstructions: Contact NCEI for other distribution options and instructions.
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description: Download seismic data from this cruise.
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statement: Data Quality: The Knudsen operated continuously through the entire cruise, with only minor (on the order of minutes) data gaps. For the first two weeks of the cruise the Knudsen operated at a ping rate of approximately 5 seconds. For the final 4 or 5 days, the ping rate was reduced to approximately 2 seconds. The higher ping repetition rate improved the lateral resolution on the sub-bottom images.
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code: Knudsen 2620
type: Sonar_CHIRP
description: receiverType: Sonar_CHIRP. sourceType: Sonar_CHIRP. acquisitionSystemName: Knudsen 2620. acquisitionSystemType: digital. seismicNavSystem: C-NAV 3050. surveyDatum: WGS84. shotInterval_inSecondsOrMeters: 5. sampleInterval_inMicroseconds: 167. sweepFrequency: 2 kHz to 5 kHz. recordLength_inSeconds: 0.27. recordingDelay: yes.
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title: R/V Marcus G. Langseth
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description: The Marcus G. Langseth serves as the national seismic research facility for the United States academic research community. The R/V Marcus G. Langseth's unique seismic capability allows it to provide both 2D and 3D maps of the earth's structure miles below the seafloor. Utilizing the vessel's other capabilities, expeditions have collected sediment cores for understanding climate variations throughout the Earth'Âs history, sampled seawater for determining physical and chemical properties of the oceans, and deployed remotely operated vehicles (ROVs) for studying submarine volcanoes. Scientists and researchers from all over the world are encouraged to participate in research programs aboard the Langseth.
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deliveryPoint: P.O. Box 1000
deliveryPoint: 61 Route 9W
city: Palisades
administrativeArea: NY
postalCode: 10964-1000
country: USA
electronicMailAddress: director@ldeo.columbia.edu
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title: Kongsberg EM122 Multibeam Echosounder
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name: Kongsberg EM122 information
description: Information on the Kongsberg EM122 multibeam sonar system
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code: Kongsberg EM122
type: Multibeam Echosounder
description: EM 122 multibeam echosounder is a high performance echosounder for deep water mapping with up to 288 simultaneous beams. The EM 122 is designed to perform seabed mapping to full ocean depth with an unsurpassed resolution, coverage and accuracy. The system is cost effective, reliable, and easily operated. The design of the EM 122 is based on more than 50 years of hydrographic experience with echo sounders, sonars and underwater positioning for civilian and military use. It is the latest model in a series of deep sea multibeam echo sounders started with the EM 12 in 1990 and followed by the EM 121 and the EM 120, of which about 40 systems are operational. It uses the same transducers as in the EM 120 but with new electronics and software. Compared with the EM 120 the EM 122 has up to four times the resolution in terms of sounding density through inclusion of multiping capability and more than twice the number of detections per swath. High density signal processing is a major improvement, to keep the acoustic footprint size small even for the outer beams in the swath. In typical ocean depths a sounding spacing of about 50 m across and along is achievable. The achievable swath width of the EM 122 is in the order of 30,000 m, or about 25% more than possible with the EM 120. This is obtained by using long FM chirps which gains about 15 dB in signal to noise ratio compared to CW pulses. The EM 122 is a complete system. All necessary sensor interfaces, data displays for quality control and sensor calibration, seabed visualization, and data logging are a standard part of the system, as is integrated seabed acoustical imaging capability (side scan). Including a higher frequency multibeam echo sounder such as EM 710 with the EM 122 system can give a total system solution meeting the strictest IHO requirements for all water depths. As proven with the EM 120, an accuracy of better than 0.2% of depth in deep waters is readily achievable with the EM 122.