Airborne electromagnetic and magnetic survey, western Hualapai Indian Reservation near Grand Canyon West and Peach Springs, Arizona, 2018: Processed AEM data

Airborne electromagnetic (AEM) and magnetic survey data were collected during March 2018 along 1,637 line kilometers over the western Hualapai Reservation and surrounding areas. The survey was conducted as part of a study of the groundwater resources of the Truxton basin and Hualapai Plateau. The survey was designed to improve our understanding of the geometry the major hydrostratigraphic contacts and regional-scale geologic structures of the study area. Minimally processed binary AEM data received from the contractor were imported into the Aarhus Workbench software (Aarhus Geosoftware, Aarhus, Denmark) and processed. Filters were applied to inclinometer and spatial positioning data to smooth raw data and remove sensor drop outs. Altimeter data were filtered, smoothed, and manually edited to correct false altitudes associated with trees and other obstacles, resulting in processed altitude representative of the distance between the AEM sensor airframe and bare earth. Ground surface elevations were imported from the 1 arc second USGS National Elevation Dataset. Raw electromagnetic data were visually examined for couplings and noise associated with infrastructure and considered in the context of the locations of known or suspected infrastructure (power lines, pipe lines, etc...) and magnetic anomalies; impacted data were manually removed. Additional soundings were culled where induced polarization effects were suspected. Culled electromagnetic data were spatially averaged using a sounding distance of 1.5 seconds and trapezoidal filter widths of 6 and 8 seconds applied after gate time 1e-5 and 1e-4 seconds (low moment data) and 6 and 8 seconds applied after 1e-4 and 1e-3 seconds (high moment data). Low-signal data were removed from the averaged data through a combination of filters and manual culling. The data provided include fully processed electromagnetic data produced from minimally processed contractor-delivered data, also provided with this data release. The digital data are described in the data dictionary, additional details regarding processing steps are described in the metadata.

                                            [
  "010:12"
]
                                        

                                            {
  "fn": "Lyndsay B. Ball",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:lbball@usgs.gov"
}
                                        

                                            [
  {
    "@type": "dcat:Distribution",
    "title": "Digital Data",
    "format": "XML",
    "accessURL": "https://doi.org/10.5066/P91OLJN3",
    "mediaType": "application/http",
    "description": "Landing page for access to the data"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Original Metadata",
    "format": "XML",
    "mediaType": "text/xml",
    "description": "The metadata original format",
    "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.5d606016e4b01d82ce98558e.xml"
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                                            [
  "AZWSC",
  "Arizona",
  "Arizona Water Science Center",
  "GGGSC",
  "Geology, Geophysics, and Geochemistry Science Center",
  "Grand Canyon",
  "Grand Canyon West Airport",
  "Hualapai Indian Reservation",
  "Hualapai Plateau",
  "Hurricane Fault",
  "Mohave County",
  "Music Mountains",
  "Peach Springs",
  "Truxton",
  "Truxton Basin",
  "Truxton Valley",
  "USGS:5d606016e4b01d82ce98558e",
  "aeromagnetic surveying",
  "electromagnetic surveying",
  "environment",
  "geologic structure",
  "geophysics",
  "geoscientificInformation",
  "geospatial datasets",
  "groundwater",
  "hydrogeology",
  "resistivity"
]
                                        

                                            {
  "name": "U.S. Geological Survey",
  "@type": "org:Organization"
}
                                        

                                            [
  "Geospatial"
]