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Range of values | |
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Minimum: | 1 |
Maximum: | 1 |
Units: | shot |
Resolution: | 1 |
Range of values | |
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Minimum: | 2014 |
Maximum: | 2014 |
Units: | year |
Resolution: | 1 |
Range of values | |
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Minimum: | 1147 |
Maximum: | 18543 |
Units: | shot |
Resolution: | 1 |
Range of values | |
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Minimum: | 1.402069 |
Maximum: | 21.554634 |
Units: | kilometers |
Resolution: | 0.000001 |
1. SIOSEIS (version 2013.1.1) was used to read SEG-Y files, renumber shots starting from one, extract the envelope-detected trace, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data.
2. The SIOSEIS script Sio_medianstk applied a two-trace median stack (trim 50 percent of the values furthest from the median amplitude) to improve subsequent water bottom picking.
3. The script Read512i_mstk was used to read renumbered and two-trace median filter stacked SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude, latitude, year, Julian day, and time of day (UTC). Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, 500, and shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 18 N coordinates (WGS 84) using Proj (version 4.6.0). End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images.
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Access_Constraints | none |
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Use_Constraints | Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. |
Data format: | The WinZip (version 14.0) file contains a shapefile of chirp seismic-reflection tracklines collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of Fire Island, NY in 2014 and the associated metadata. in format Shapefile (version ArcGIS 10.3) Shapefile Size: 3.1 |
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Network links: |
https://cmgds.marine.usgs.gov/data/field-activity-data/2014-009-FA/data/seismics/2014-009-FA_512i_Tracklines.zip https://doi.org/10.5066/F7FF3QTQ https://cmgds.marine.usgs.gov/data/field-activity-data/2014-009-FA/ |