namss.L-11-11-BS.mcs.airgun.zip
Dataset zip file
2011-08-06
creation
In 2011, the U.S. Geological Survey (USGS) conducted a 2D MCS survey in support of U.S. extended continental shelf (ECS) assessments in the Bering Sea. The survey was conducted with the R/V Marcus G. Langseth, a geophysical research vessel owned by the National Science Foundation and operated by Lamont-Doherty Earth Observatory of Columbia University.
This field survey were designed to determine sediment thickness and acoustic velocity in support of extended continental shelf maritime zone definition, conducted on behalf of the interagency U.S. Extended Continental Shelf Project, and are being released without restriction or warranty.
processed
Seismic:Active:MCS
Seismic:Reflection
Migration
Stack
DigitalSeg:DigitallyAcquired
Online
The quality of the MCS data was excellent on the cruise. No major problems occurred with the seismic system. The airguns were powered down 6 times during L-11-11-BS but these power-downs introduced no significant data gaps. Most power-downs lasted 30 minutes or less. In these cases, with an 8 km streamer, the fold was reduced but no gap in the profile section resulted. During the survey, some variability in gun array volume and streamer depth occurred due to weather and maintenance requirements. This is documented in the observer logs for each acquisition line.
dataset
Field data were recorded in demultiplexed SEG-D format. Upon completion of an MCS profile line, SEG-D data files (one per shot) were posted to the ship’s server. These were concatenated into a single SEG-D file and imported to Paradigm’s Focus software for processing. Products of shipboard processing included raw shot gathers, CDP gathers processed through gapped predictive deconvolution, preliminary unmigrated stacked sections, post-stack FK-migrated sections, and stacking velocity fields. All MCS processing was reviewed and finalized post-cruise.
2011-09-01
58.82116
55.16293
-176.85226
-185.52164
Bering Sea
2011-08-06
2011-09-01
U.S. Geological Survey
Patrick Hart
hart@usgs.gov
pointOfContact
Pacific Coastal and Marine Science Center
Ginger Barth
gbarth@usgs.gov
principalInvestigator
open
U.S. Geological Survey
Patrick Hart
hart@usgs.gov
pointOfContact
2016-03-01
Hydrophone_Streamer
SeismicSource_Gun_Air
Sercel Syntrak 960
digital
C-Nav 3050
176.00000
223.10000
636
1
636
12.50000
8000.00000
636
9.00000
True
8.00000
6600.00000
Cubic Inches
137.89510
36
9.00000
Distance
50.00000
2000
16.00000
True
True
R/V Marcus G. Langseth
Lamont-Doherty Earth Observatory
WGS84
yes
410
2020-09-17
U.S. Geological Survey
Peter Triezenberg
ptriezenberg@usgs.gov
pointOfContact
Seismic Metadata v.1
2016-05-23