Metadata: Identification_Information: Citation: Citation_Information: Originator: VeeAnn A. Cross Originator: David C. Twichell Publication_Date: 2003 Title: JPEG Images of Seismic-Reflection Profiles Collected in Lake Mead in 2001 Edition: 1.0 Geospatial_Data_Presentation_Form: raster Series_Information: Series_Name: Open-File Report Issue_Identification: 02-478 Publication_Information: Publication_Place: Woods Hole Field Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Team Online_Linkage: https://doi.org/10.3133/ofr02478 Larger_Work_Citation: Citation_Information: Originator: VeeAnn A. Cross Originator: David C. Twichell Publication_Date: 2003 Title: Archive of Seismic-Reflection Data Collected During USGS Cruise Lake Mead 01007 in Lake Mead - Nevada and Arizona, 1-28 April, 2001 Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 02-478 Publication_Information: Publication_Place: Woods Hole Field Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Team Online_Linkage: https://doi.org/10.3133/ofr02478 Description: Abstract: Lake Mead is a large interstate reservoir located in the Mojave Desert of southeastern Nevada and northwestern Arizona. It was impounded in 1935 by the construction of Hoover Dam and is one of a series of multi-purpose reservoirs on the Colorado River. The lake extends 183 km from the mouth of the Grand Canyon to Black Canyon, the site of Hoover Dam, and provides water for residential, commercial, industrial, recreational, and other non-agricultural users in communities across the southwestern United States. Extensive research has been conducted on Lake Mead, but a majority of the studies have involved determining levels of anthropogenic contaminants such as synthetic organic compounds, heavy metals and dissolved ions, furans/dioxins, and nutrient loading in lake water, sediment, and biota (Preissler, et al., 1998; Bevans et al, 1996; Bevans et al., 1998; Covay and Leiker, 1998; LaBounty and Horn, 1997; Paulson, 1981). By contrast, little work has focused on the sediments in the lake and the processes of deposition (Gould, 1951). To address these questions, sidescan-sonar imagery and high-resolution seismic-reflection profiles were collected throughout Lake Mead by the USGS in cooperation with researchers from University of Nevada Las Vegas (UNLV). These data allow a detailed mapping of the surficial geology and the distribution and thickness of sediment that has accumulated in the lake since the completion of Hoover Dam. Results indicate that the accumulation of post-impoundment sediment is primarily restricted to former river and stream beds that are now submerged below the lake while the margins of the lake appear to be devoid of post-impoundment sediment. The sediment cover along the original Colorado River bed is continuous and is typically greater than 10 m thick through much of its length. Sediment thickness in some areas exceeds 35 m while the smaller tributary valleys typically are filled with less than 4 m of sediment. Away from the river beds that are now covered with post-impoundment sediment, pre-impoundment alluvial deposits and rock outcrops are still exposed on the lake floor. Purpose: These images of the seismic-reflection profiles are provided so that individuals can preview the seismic data without the requirement of special software. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20010401 Ending_Date: 20010426 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -114.7642 East_Bounding_Coordinate: -114.0187 North_Bounding_Coordinate: 36.4871 South_Bounding_Coordinate: 36.0000 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:b609ba89-8633-4750-ba74-a272f4ecad9f Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: seismic Theme_Keyword: JPEG Theme_Keyword: chirp Theme_Keyword: boomer Theme_Keyword: images Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Field Center Theme_Keyword: Open-File Report Theme_Keyword: OFR02-478 Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sub-bottom profiling Theme_Keyword: seismic reflection methods Theme_Keyword: marine geophysics Theme_Keyword: image collections Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: inlandWaters Place: Place_Keyword_Thesaurus: None Place_Keyword: Lake Mead Place_Keyword: Nevada Place_Keyword: United States Place_Keyword: Las Vegas Place_Keyword: Hoover Dam Place_Keyword: Colorado River Place_Keyword: Mojave Desert Place_Keyword: Grand Canyon Place_Keyword: Black Canyon Place_Keyword: Arizona Access_Constraints: No access constraints. Please see 'Distribution Information' for details. Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: USGS Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Cross_Reference: Citation_Information: Originator: H.E. Bevans Originator: S.L. Goodbred Originator: J.F. Miesner Originator: S.A. Watkins Originator: T.S. Gross Originator: N.D. Denslow Originator: T. Choeb Publication_Date: 1996 Title: Synthetic organic compounds and carp endrocrinology and histology, Las Vegas Wash and Las Vegas and Callville bays of Lake Mead, Nevada Series_Information: Series_Name: Water-Resources Investigations Issue_Identification: 96-4266 Publication_Information: Publication_Place: Reston, VA Publisher: U.S.Geological Survey Water Resources Cross_Reference: Citation_Information: Originator: H.E. Bevans Originator: M.S. Lico Originator: S.J. Lawrence Publication_Date: 1998 Title: Water quality in the Las Vegas Valley area and the Carson and Truckee River basins, Nevada and California, 1992-1996 Series_Information: Series_Name: Circular Issue_Identification: 1170 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/cir1170 Cross_Reference: Citation_Information: Originator: K.J. Couvay Originator: T.J. Leiker Publication_Date: 1998 Title: Synthetic organic compounds in water and bottom sediment from streams, detention basins, and sewage-treatment plant outfalls in Las Vegas Valley, Nevada, 1997 Series_Information: Series_Name: Open-File Report Issue_Identification: 98-633 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr98633 Cross_Reference: Citation_Information: Originator: H.R. Gould Publication_Date: 1951 Title: Some quantitative aspects of Lake Mead turbidity currents Series_Information: Series_Name: SEPM Society for Sedimentary Geology Special Publication Issue_Identification: No. 2 Publication_Information: Publication_Place: McLean, VA Publisher: SEPM Society for Sedimentary Geology Online_Linkage: https://doi.org/10.2110/pec.51.02.0034 Cross_Reference: Citation_Information: Originator: J.F. LaBounty Originator: M.J. Horn Publication_Date: 1997 Title: The influence of drainage from the Las Vegas Valley on the limnology of Boulder Basin, Lake Mead, Arizona-Nevada Series_Information: Series_Name: Journal of Lake and Reservoir Management Issue_Identification: v. 13, issue 2 Publication_Information: Publication_Place: London, England Publisher: Journal of Lake and Reservoir Management Online_Linkage: https://doi.org/10.1080/07438149709354301 Cross_Reference: Citation_Information: Originator: L.J. Paulson Publication_Date: 1981 Title: Nutrient management with hydroelectric dams on the Colorado River Series_Information: Series_Name: Technical Report Issue_Identification: #8 Publication_Information: Publication_Place: Department of Biological Sciences, University of Nevada, Las Vegas, Nevada Publisher: Lake Mead Limnological Research Center Cross_Reference: Citation_Information: Originator: A.M. Preissler Originator: G.A. Roach Originator: K.A. Thomas Originator: J.W. Wilson Publication_Date: 1998 Title: Water resources data, Nevada, water year 1998 Series_Information: Series_Name: Water Resources Data Nevada Issue_Identification: NV-98-1 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Data_Quality_Information: Logical_Consistency_Report: Not available from the original metadata. Completeness_Report: These files represent images of all the seismic-reflection data collected in Lake Mead in 2001 by the USGS. Lineage: Process_Step: Process_Description: The seismic data collected in 2001 was actually of 2 types: chirp and boomer. The chirp data was collected as part of the SIS-1000 system, while the boomer data was logged onto a Triton Elics system. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2001 Process_Step: Process_Description: The SEG-Y data was then loaded into Landmark software. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: Metadata imported. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Source_Used_Citation_Abbreviation: F:\LMSEGY\2001\segy\metadata.xml Process_Date: 2002 Process_Step: Process_Description: CGM images were created of each seismic profile. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: These CGM images were converted to JPEGs using Larson software. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: These jpegs were then downsampled to a GIF format. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: These GIFS were then converted back to JPEGs. *The process date was added as a required element when the metadata was updated in 2026. The process date is an assumption based on the process step itself. Process_Date: 2002 Process_Step: Process_Description: This metadata file was updated as part of metadata maintenance when added to the web accessible folder. Edits were performed on the original text version of the metadata, then converted to XML. These edits included: Fixed all errors flagged by MP. These included (but are not limited to) adding required elements such as publication place when publisher is provided; added process dates. Additionally, added some DOI online links when possible; added supplemental information with link to the field activity; added USGS Thesaurus and ISO 19115 Topic Category thesauri and appropriate terms in each; renamed “General” thesauri to “None” thesauri; updated the use and access constraints to approved statements; updated the distribution liability to a current approved statement; added a digitale distribution format secion; added a geospatial presentation format; updated metadata email to a generic email in the event the person leaves the USGS (20260601) Process_Date: 20260601 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: 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 milliseconds. The scale bar along the bottom of the image is inaccurate due to a bug in the digital processing software and therefore should be ignored. Entity_and_Attribute_Detail_Citation: Not provided with original metadata; assumed to be the data processor. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: USGS Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: JPEG Transfer_Size: 14.1 Digital_Transfer_Option: Offline_Option: Offline_Media: These data were released on DVD that is currently not available online. Recording_Format: Not documented with the original metadata. Fees: None Metadata_Reference_Information: Metadata_Date: 20260602 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: USGS Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the contact person is no longer with the USGS. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998