Data Downloads

The seismic data described in this report, including field logs, trackline locations, navigation, and GIS data files with accompanying Federal Geographic Data Committee (FGDC) metadata, can be downloaded from Forde and others (2018) or by using the table below. Additionally, the seismic profiles can be viewed by clicking on the trackline name listed on the location map (fig. 4).

Field Activity Collection System (FACS) geophysical operations logs are provided as Portable Document Format (PDF) files and can be viewed using the free software Adobe Reader. Digital FACS and field logs were generated from field notes and logbooks. The chirp subbottom profiles are provided as GIF images and can be viewed using standard image viewing software. The trackline navigation data are provided as ASCII text files (.txt) and GIS data files in Esri shapefile (.shp) format; the GIS files can be opened using the free software Explorer for ArcGIS. GIS data files are referenced to the WGS84 geographic coordinate system.

Figure 4. Figure 4. Location map of all digital chirp subbottom profile data collected during U.S. Geological Survey (USGS) field activity 2015-331-FA. Tracklines represent the vessel position during the survey. Click on a line number to view each subbottom profile (.gif format). This map uses the World Geographic System of 1984 (WGS84) coordinate system. Land area was derived from USGS light detection and ranging (lidar) data collected in 2015 (USGS, 2017).

Data Download Table