Jane F. Denny Unpublished material raster Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program The online link is to the field activity page. See the supplemental information and distribution section for additional information regarding viewing and downloading the data. https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-031-FA Bear Lake is a tectonic lake that has existed for at least several hundred thousand years. The lake basin is a relatively simple half graben, a spoon-shaped depression tilted toward the main fault on the east side of the lake. The U.S. Geological Survey, in cooperation with researchers from several universities, has been studying the sediments of Bear Lake since 1996. The general purpose of this effort is to reconstruct past limnological conditions and regional climate on a range of timescales, from hundreds of years to hundreds of thousands of years. This research relates to a variety of human concerns, including water usage in the Bear River basin. Past work has included several coring operations, a seismic-reflection survey, sediment-trap deployments, a barge-mounted drilling operation with the GLAD800 drill rig, and a variety of other studies. The objectives of the September, 2002 operations, preliminarily reported here, were (1) to compile a detailed bathymetric map of the lake using swath-mapping techniques, in order to provide baseline data for a variety of applications and studies, and (2) to complete a sidescan-sonar survey of the lake, providing a nearly complete acoustic image of the lake floor. Limited amounts of subbottom acoustic-reflection data (CHIRP) were also collected, along with samples of lake-floor sediments representative of different kinds of backscatter patterns. These surveys followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data). The chirp seismic-reflection data were used to look for evidence of sublacustrine spring discharge and to image possible fault scarps that cut the lake floor. For more information on the seismic surveys see https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-031-FA. These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications. The JPEG format of these data (along with other data associated with this field activity) were released through the Open-File Report 2003-150 (https://pubs.usgs.gov/of/2003/of03-150/). See the cross-reference for full citation information. 20020904 20020916 Publication Date Complete None planned -111.5 -111.17 42.2 41.08 USGS Metadata Identifier USGS:48a96e05-dbf6-44d0-ac9a-50d05560027b None seismic reflection SEG-Y Chirp SEG-Y U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Woods Hole Field Center ISO 19115 Topic Category inlandWaters geoscientificInformation USGS Thesaurus sub-bottom profiling geophysics None Bear lake Utah Idaho Western Lakes North America United States None The U.S. Geological Survey must be referenced as the originator of the dataset in any future publications. Jane F. Denny U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543 USA 508-457-2311 508-457-2310 jdenny@usgs.gov Joint Photographic Experts Group (JPEG) Image format Jane F. Denny Steve M. Colman 2003 Open-File Report 03-150 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2003/of03-150/ Processed seismic data were converted to JPG format for ease of file display. Quality control was conducted during processing. Complete WAAS (Wide Area Augmentation System) is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. All WAAS data are referenced to WGS84. The data were acquired with an Edgetech 424 kHz CHIRP sub-bottom profiler. The system was towed at the surface, close to the survey vessel. Horizontal accuracy is thus assumed to be within +/-3 meters. Raw SEGY-Y data were processed utilizing Colorado School of Mines Seismic Unix (SU) seimsic processing software. The seismic data were recorded with TEI Delph Seismics acquisition software. Durinr processing, the SEG-Y data were converted to SU format. Gains were applied to the data to reduce noise and enhance the data. 'Mute' was used to remove all noise/signals within the water column. The data were then converted to postscript and JPG formats. 20020916 Jane F. Denny US Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543 USA 508-457-2311 508-457-2310 jdenny@usgs.gov Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The larger work citation in the identification section was added. Added the online link to the zipped data file in the Identification_Information section. Added ISO 19115 Topic Category keywords. Modified the Distribution section to include the format and the link to the data. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. 20170228 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov This metadata record was modified from one describing JPEG images to reflect the SEG-Y version of the same data (Open-File Report 2003-150, https://pubs.usgs.gov/of/2003/of03-150/). Changes were made to the Citation and Distribution_Information. 20171121 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov USGS Thesaurus keywords added to the keyword section. 20180720 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Added keywords section with USGS persistent identifier as theme keyword. 20200908 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Raster pixel Jane F. Denny US Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543 USA 508-457-2311 508-457-2310 jdenny@usgs.gov This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. SEG-Y Link is to a folder containing SEG-Y files. https://cmgds.marine.usgs.gov/data/2002_031_FA/ The online link gives access to the folder containing the individual SEG-Y files. none 20240318 Jane F. Denny US Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543 USA 508-457-2311 508-457-2310 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 None None