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   givenName: Karl
   givenName: Karl
   mainEntityOfPage: https://orcid.org/0000-0003-3075-4703
   mainEntityOfPage: https://orcid.org/0000-0003-3075-4703
OpenAlex:
  created_date: '2023-07-21'
  display_name: Karl J. Ellefsen
  display_name_alternatives:
  - Karl Ellefsen
  - K. J. Ellefsen
  - Karl J. Ellefsen
  ids:
    openalex: https://openalex.org/A5031333239
    orcid: https://orcid.org/0000-0003-3075-4703
  last_known_institutions:
  - country_code: US
    display_name: United States Geological Survey
    id: https://openalex.org/I1286329397
    lineage:
    - https://openalex.org/I1286329397
    - https://openalex.org/I1335927249
    ror: https://ror.org/035a68863
    type: government
  orcid: https://orcid.org/0000-0003-3075-4703
  topics:
  - count: 46
    display_name: Applications of Ground-Penetrating Radar in Geoscience and Engineering
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T11609
    subfield:
      display_name: Ocean Engineering
      id: https://openalex.org/subfields/2212
  - count: 35
    display_name: Seismic Waveform Inversion in Geophysics
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T10271
    subfield:
      display_name: Geophysics
      id: https://openalex.org/subfields/1908
  - count: 33
    display_name: High-Resolution Seismic Noise Tomography
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T11757
    subfield:
      display_name: Geophysics
      id: https://openalex.org/subfields/1908
  - count: 23
    display_name: Machine Learning for Mineral Prospectivity Mapping
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Computer Science
      id: https://openalex.org/fields/17
    id: https://openalex.org/T12157
    subfield:
      display_name: Artificial Intelligence
      id: https://openalex.org/subfields/1702
  - count: 15
    display_name: Geophysical Exploration and Monitoring Techniques
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T10572
    subfield:
      display_name: Geophysics
      id: https://openalex.org/subfields/1908
  - count: 12
    display_name: Digital Soil Mapping Techniques
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T10770
    subfield:
      display_name: Environmental Engineering
      id: https://openalex.org/subfields/2305
  - count: 9
    display_name: Drilling Fluid Technology and Well Integrity
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T10892
    subfield:
      display_name: Ocean Engineering
      id: https://openalex.org/subfields/2212
  - count: 5
    display_name: Microwave Imaging for Breast Cancer Detection
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T11739
    subfield:
      display_name: Biomedical Engineering
      id: https://openalex.org/subfields/2204
  - count: 5
    display_name: Multiscale Seafloor Mapping and Classification Techniques
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T11698
    subfield:
      display_name: Oceanography
      id: https://openalex.org/subfields/1910
  - count: 5
    display_name: Geological Modeling and Uncertainty Analysis
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T13067
    subfield:
      display_name: Geochemistry and Petrology
      id: https://openalex.org/subfields/1906
  - count: 4
    display_name: Applications of Clay Nanotubes in Various Fields
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Materials Science
      id: https://openalex.org/fields/25
    id: https://openalex.org/T11852
    subfield:
      display_name: Biomaterials
      id: https://openalex.org/subfields/2502
  - count: 3
    display_name: Non-Destructive Techniques Based on Eddy Current Testing
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T12169
    subfield:
      display_name: Mechanical Engineering
      id: https://openalex.org/subfields/2210
  - count: 3
    display_name: Geochemistry of Manganese Oxides in Sedimentary Environments
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Earth and Planetary Sciences
      id: https://openalex.org/fields/19
    id: https://openalex.org/T11740
    subfield:
      display_name: Geochemistry and Petrology
      id: https://openalex.org/subfields/1906
  - count: 3
    display_name: Comminution in Mineral Processing
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T12282
    subfield:
      display_name: Mechanical Engineering
      id: https://openalex.org/subfields/2210
  - count: 3
    display_name: Machine Learning for Earthquake Early Warning Systems
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Computer Science
      id: https://openalex.org/fields/17
    id: https://openalex.org/T13018
    subfield:
      display_name: Artificial Intelligence
      id: https://openalex.org/subfields/1702
  - count: 3
    display_name: Rock Mechanics and Wave Propagation in Geomedia
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T13619
    subfield:
      display_name: Mechanics of Materials
      id: https://openalex.org/subfields/2211
  - count: 3
    display_name: Environmental Impact of Heavy Metal Contamination
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T10139
    subfield:
      display_name: Pollution
      id: https://openalex.org/subfields/2310
  - count: 3
    display_name: Chemistry of Actinide and Lanthanide Elements
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Chemistry
      id: https://openalex.org/fields/16
    id: https://openalex.org/T10973
    subfield:
      display_name: Inorganic Chemistry
      id: https://openalex.org/subfields/1604
  - count: 3
    display_name: Model-Based Clustering with Mixture Models
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Computer Science
      id: https://openalex.org/fields/17
    id: https://openalex.org/T11901
    subfield:
      display_name: Artificial Intelligence
      id: https://openalex.org/subfields/1702
  - count: 3
    display_name: Application of Stable Isotopes in Trophic Ecology
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T12073
    subfield:
      display_name: Ecology
      id: https://openalex.org/subfields/2303
  - count: 2
    display_name: Finite-Difference Time-Domain Methods in Electromagnetics
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T11263
    subfield:
      display_name: Electrical and Electronic Engineering
      id: https://openalex.org/subfields/2208
  - count: 2
    display_name: Anaerobic Methane Oxidation and Gas Hydrates
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T10995
    subfield:
      display_name: Environmental Chemistry
      id: https://openalex.org/subfields/2304
  - count: 2
    display_name: Groundwater Flow and Transport Modeling
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T10894
    subfield:
      display_name: Environmental Engineering
      id: https://openalex.org/subfields/2305
  - count: 2
    display_name: Hydraulic Fracturing in Shale Gas Reservoirs
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Engineering
      id: https://openalex.org/fields/22
    id: https://openalex.org/T10635
    subfield:
      display_name: Mechanical Engineering
      id: https://openalex.org/subfields/2210
  - count: 2
    display_name: Water Quality and Hydrogeology Research
    domain:
      display_name: Physical Sciences
      id: https://openalex.org/domains/3
    field:
      display_name: Environmental Science
      id: https://openalex.org/fields/23
    id: https://openalex.org/T12773
    subfield:
      display_name: Water Science and Technology
      id: https://openalex.org/subfields/2312
  updated_date: '2024-05-19T05:59:06.490444'
USGS Staff Profile:
USGS Staff Profile:
   '@context': https://schema.org
   '@context': https://schema.org