David S. Foster 2005 remote-sensing image Open-File Report 2004-1247 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20041247 https://pubs.usgs.gov/of/2004/1247/htmldocs/metadata.htm https://pubs.usgs.gov/of/2004/1247/data/seisimages/seisimg.zip VeeAnn A. Cross David S. Foster David C. Twichell 2005 Open-File Report 2004-1247 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2004/1247/ Lake Mohave is one of several multi-purpose reservoirs that have been constructed on the Colorado River. The lake was formed upon completion of the Davis Dam in 1953. No mapping of the floor of the lake had been conducted since completion of the Davis Dam. The U.S. Geological Survey, in cooperation with researchers from the University of Nevada Las Vegas, completed a geophysical survey of this lake in April 2002. The survey included collection of sidescan sonar imagery of nearly the entire lake floor, and high-resolution seismic-reflection profiles along widely spaced lines throughout the lake. The detailed mapping of the lake floor was used to determine the amount of sediment that had accumulated in the lake since impoundment, its distribution, and the processes of deposition. These images of the seismic-reflection profiles are provided so that individuals can preview the seismic data without the requirement of special software. 20020418 20020428 ground condition Complete None planned -114.711633 -114.570683 35.868300 35.200633 USGS Metadata Identifier USGS:486d1ef1-fb59-4345-9a39-2333703f3197 None chirp CMGP Coastal and Marine Geology Program images JPEG Knudsen lake OF 2004-1247 Open-File Report reservoir sediment thickness seismic seismic-reflection subbottom U.S. Geological Survey USGS Woods Hole Science Center field activity identifier H-1-02-SW field activity serial number 02020 USGS Thesaurus sub-bottom profiling image collections geophysics None Arizona Colorado River Davis Dam Hoover Dam Lake Mohave Las Vegas Mojave Desert Nelson's Landing Nevada North America United States None. The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data. David S. Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2271 (508) 457-2310 dfoster@usgs.gov Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700 Information unavailable from original metadata. Information unavailable from original metadata. The seismic data are Knudsen chirp seismic data. The seismic processing software package SIOSEIS was used to convert the Knudsen SEG-Y data to "true" chirp seismic data, while at the same time renumbering the traces so that each seismic data file started at shot 1 and incremented each shot by 1. unknown David S. Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2271 (508) 457-2310 dfoster@usgs.gov These processed seismic profiles were then run through Seismic Unix to generate postscript images of each profile. unknown David S. Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2271 (508) 457-2310 dfoster@usgs.gov These postscript images were then converted to JPEG format using ppm software on a Unix system. unknown David S. Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2271 (508) 457-2310 dfoster@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.). Attempted to modify http to https where appropriate. Modified the data citation to add series and publication information, as well as include a landing page link. Removed the incomplete spatial reference information as it was inappropriate for this data type. Added the distribution format and link to the data in the standard order process section. 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. 20171205 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 Crossref DOI link was added as the first link in the metadata. 20191118 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 751 11821 1 These images are intended only as previews of the seismic-reflection data. In each image, the x-axis represents shot point, the y-axis is two-way travel time in seconds. U.S. Geological Survey David S. Foster U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2271 (508) 457-2310 dfoster@usgs.gov Downloadable Data These data were 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 for the accuracy, completeness, or usefulness of any 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 in this publication 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. JPEG Zip file containing the JPEG images. 50 https://pubs.usgs.gov/of/2004/1247/data/seisimages/seisimg.zip none 20240318 VeeAnn A. Cross U.S. Geological Survey Marine Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 (508) 548-8700 x2251 (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 local time