Alicia F. Balster-Gee
Daniel S. Brothers
Jared W. Kluesner
Nathan C. Miller
Peter J. Haeussler
Thomas F. O’Brien
Rachel K. Marcuson
Patrick E. Hart
James E. Conrad
Maureen L. Walton
Alex R. Nichols
20221223
Chirp sub-bottom data collected in the Yakobi Sea Valley during USGS Field Activity 2017-621-FA
seismic-reflection data in SEG-Y format
data release
DOI:10.5066/P9QXL00L
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9QXL00L
Alicia F. Balster-Gee
Daniel S. Brothers
Jared W. Kluesner
Nathan C. Miller
Peter J. Haeussler
Thomas F. O’Brien
Rachel K. Marcuson
Patrick E. Hart
James E. Conrad
Maureen L. Walton
Alex R. Nichols
2022
Multichannel sparker and chirp seismic reflection data collected offshore southeast Alaska during USGS Field Activity 2017-621-FA
data release
DOI:10.5066/P9QXL00L
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/P9QXL00L
Chirp sub-bottom data were collected by the U.S. Geological Survey in July and August 2017 to expand data coverage along the Queen Charlotte Fault system in the Yakobi Sea Valley of southeast Alaska.
This dataset contains swell corrected chirp SEG-Y data collected by the U.S. Geological Survey during field activity 2017-621-FA in the Yakobi Sea Valley of southeast Alaska. Data were acquired to study earthquake hazards, fault mechanics and submarine mass wasting processes along the Queen Charlotte fault system, a 1200 km long transform boundary that separates the Pacific and North American tectonic plates. These data are intended for science researchers, students from elementary through college, policy makers, and general public.
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-621-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
20170627
20170726
ground condition at time data were collected
As needed
-137.063269
-137.029732
58.296167
58.293057
USGS Metadata Identifier
USGS:34af1d81-ee4a-43c9-b5ef-37499d436288
ISO 19115 Topic Category
oceans
geoscientificInformation
location
Data Categories for Marine Planning
substrate
USGS Thesaurus
marine geophysics
geospatial datasets
sub-bottom profiling
marine geophysics
Marine Realms Information Bank (MRIB) keywords
seismic methods
seismic reflection profiling
data processing
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
Woods Hole Coastal and Marine Science Center
WHCMSC
field activity number 2017-621-FA
seismic navigation
seismic reflection
SEG-Y traces
Geographic Names Information System (GNIS)
Pacific Ocean
State of Alaska
Palma Bay
Yakobi Island
Glacier Bay National Park and Preserve
Graves Harbor
NGA GEOnet Names Server (GNS)
Alexander Archipelago
Cross Sound
None
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
2017-621-FA_chirp_trackline_map.png
Map of the chirp profile acquired during USGS field activity 2017-621-FA.
PNG
The authors acknowledge the crew of the R/V Ocean Starr and everyone involved in survey planning and execution.
Chirp data were recorded in SEG-Y rev. 1 format (https://seg.org/Portals/0/SEG/News%20and%20Resources/Technical%20Standards/seg_d_rev2.1.pdf) using Discover acquisition software. Data were recorded with an Edgetech SB-512i chirp towfish (https://www.usgs.gov/centers/pcmsc/science/chirp-512i). Shearwater Reveal (v. 2021, https://www.shearwatergeo.com/4/reveal-software) software was used to process the data as described in the process step below.
Quality control was conducted during acquisition. Some seismic profiles have gaps in them due to system crashes or intentional shutdowns as required under terms of our operating permit to protect marine mammals.
Quality control was conducted during acquisition and processing to ensure consistency of SEG-Y header navigation and seismic-reflection data that matches bathymetry along the tracklines.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Data release will be updated with additional SEG-Y profiles as data are processed.
+/- 0.6m 95 percent confidence (DGPS) (http://dev.wr.usgs.gov/idb/media/service_materials/2022/12/07/101121522789/Hemisphere_V100specsheet.pdf)
Two-way travel time in milliseconds is recorded in SEG-Y files.
The Discover acquisition software (v. 6) output envelope chirp data in SEG-Y format. Data were loaded into Reveal seismic software (v. 2021) and corrected for the chirp towfish depth. Data were then swell corrected over a period of 21 traces and the water column was muted. Processed data were exported to SEG-Y format with standard header byte locations. Common Midpoint (CMP) X and Y navigation points are written to header bytes 181/185 and 73/77 in UTM zone 8N coordinates. SEG-Y data files were compressed into the zip file 2017-621-FA.chirp.segy.zip.
20221114
Point
Point
1
WGS 1984 UTM Zone 8N
0.9996
-135.0
0.0
500000.0
0.0
coordinate pair
0.0001
0.0001
Meter
Zip archive of seismic traces with Time Stamp in standard SEG-Y file format
Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards
U.S. Geological Survey - CMGDS
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
SEG-Y data are available in the zip file 2017-621-FA.chirp.segy.zip that contains one standard SEG-Y format files of seismic traces with time stamp (Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards).
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
SEG-Y
SEG-Y rev 1
Zip file contains the processed seismic data per navigation line.
The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip).
39.6
https://doi.org/10.5066/P9QXL00L
Data zip file (2017-621-FA.chirp.segy.zip) can be downloaded using the Network_Resource_Name link and scrolling to the sub bottom profiler data section.
None.
Use of SEG-Y data requires specialized software, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others.
20221223
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998