Peter Dartnell Daniel S. Brothers Amy E. East Jackson Currie Pete Dal Ferro Joshua B. Logan 20210520 seismic-reflection data in SEG-Y format data release DOI:10.5066/P958Q0DX Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P958Q0DX https://www.sciencebase.gov/catalog/item/605bc058d34ec5fa65e903b5 These metadata describe high-resolution chirp sub-bottom data collected in May 2019 in Whiskeytown Lake, California. Data were collected and processed by the the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2018-686-FA. The chirp sub-bottom data are provided in SEG-Y format. High-resolution chirp sub-bottom data were collected by the U.S. Geological Survey Pacific Coastal and Marine Science Center in May of 2019 in Whiskeytown Reservoir, California using an Edgetech SB-512i sub-bottom profiler. These data were collected to measure possible debris flows into the lake during the 2018-2019 rainy season following the July-August 2018 Carr fire that burned vegetation around the entire lake. Post-fire hillslope sediment yields are commonly substantially greater than pre-fire yields, but the degree to which they increase can vary substantially. Effects of wildfire on sediment yield have important implications for hazards (debris-flow risk), ecosystem disturbance and recovery, and downstream water resources (storage capacity in lakes, as well as water quality). These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation. Additional information about the field activity from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2018-686-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20190515 ground condition at time data were collected Complete None planned -122.595 -122.522 40.653 40.597 ISO 19115 Topic Category geoscientificInformation Data Categories for Marine Planning Substrate Distributions USGS Thesaurus sub-bottom profiling geospatial datasets marine geophysics Marine Realms Information Bank (MRIB) keywords seismic reflection profiling lake bed acoustic methods mapping geophysics USGS Metadata Identifier USGS:80336e98-7562-4aa3-8246-438816d83019 None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Whiskeytown Lake State of California 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

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/605bc058d34ec5fa65e903b5?name=2018-686-FA_Chirp_sub-bottom_map.jpg&allowOpen=true Map showing transect lines where Chirp data were collected in Whiskeytown Lake. JPEG SEG-Y rev 1 Quality control was conducted during data acquisition and quality was assured during data processing No formal logical consistency tests were conducted, but quality control was conducted during acquisition. 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. Estimated to be no less than 3 m due to total propagated uncertainties of navigation as well as data processing. A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Chirp sub-bottom data were collected using an Edgetech-512i sub-bottom profiler and converted to envelope format. Sub-bottom tow fish depth is stored in header byte 49 with an elevation scalar of -1000 (header byte 69). Navigation was converted from seconds of arc to UTM zone 10N and stored unscaled in header bytes 81 and 85. 2019 Horizontal X and Y locations for each seismic profile location are stored unscaled in the SEG-Y data trace headers in header bytes 81 and 85. WGS 1984 UTM Zone 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.0001 0.0001 Meter D WGS 1984 WGS 1984 6378137.0 298.257223563 local surface 0.1 two-way travel time attribute values Seismic shots 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 - ScienceBase mailing and physical

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Zip file (2018-686-FA_Chirp_sub-bottom_SEGY.zip) containing chirp sub-bottom (SEG-Y) data collected during USGS field activity 2019-686-FA, accompanied by FGDC-compliant CMGDS metadata and a location map of transect lines. The data are divided up and presented by navigation line, as reflected in the individual file names. Chirp file sizes are limited to 200 MB so there may be several line parts per navigation line. 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 files contains the processed seismic data per navigation line and are divided based on geographic location. Winzip, 7-zip, or Winrar are free software that will open .zip files 348.6 https://www.sciencebase.gov/catalog/file/get/605bc058d34ec5fa65e903b5 https://doi.org/10.5066/P958Q0DX Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of all chirp data. The second link points to the landing page for the entire data release with the chirp data, metadata, and map. None. Use of SEG-Y data requires specialized software, such as Reveal by Shearwater Geophysical; 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. 20210520 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