Skip to main content

PNNL

  • About
  • News & Media
  • Careers
  • Events
  • Research
    • Scientific Discovery
      • Biology
        • Ecosystem Science
        • Human Health
          • Cancer Biology
          • Exposure Science & Pathogen Biology
          • Metabolic Inflammatory Diseases
        • Integrative Omics
          • Advanced Metabolomics
          • Chemical Biology
          • Mass Spectrometry-Based Measurement Technologies
          • Spatial and Single-Cell Proteomics
          • Structural Biology
        • Microbiome Science
          • Biofuels & Bioproducts
          • Human Microbiome
          • Soil Microbiome
          • Synthetic Biology
        • Computational Biology
      • Chemistry
        • Computational Chemistry
        • Chemical Separations
        • Chemical Physics
        • Catalysis
      • Earth & Coastal Sciences
        • Atmospheric Science
          • Atmospheric Aerosols
          • Human-Earth System Interactions
          • Modeling Earth Systems
        • Coastal Science
        • Ecosystem Science
        • Plant Science
        • Subsurface Science
        • Terrestrial Aquatics
      • Materials Sciences
        • Materials in Extreme Environments
        • Precision Materials by Design
        • Science of Interfaces
        • Solid Phase Processing
          • Cold Spray
          • Friction Stir Welding & Processing
          • ShAPE
      • Nuclear & Particle Physics
        • Dark Matter
        • Flavor Physics
        • Fusion Energy Science
        • Neutrino Physics
      • Quantum Information Sciences
    • Sustainable Energy
      • Energy Storage
        • Electrochemical Energy Storage
        • Flexible Loads and Generation
        • Grid Integration, Controls, and Architecture
        • Regulation, Policy, and Valuation
        • Science Supporting Energy Storage
        • Chemical Energy Storage
      • Environmental Management
        • Waste Processing
        • Radiation Measurement
        • Environmental Remediation
      • Fossil Energy
        • Subsurface Energy Systems
        • Carbon Management
          • Carbon Capture
          • Carbon Storage
          • Carbon Utilization
        • Advanced Hydrocarbon Conversion
      • Nuclear Energy
        • Fuel Cycle Research
        • Advanced Reactors
        • Reactor Operations
        • Reactor Licensing
      • Renewable Energy
        • Solar Energy
        • Wind Energy
          • Distributed Wind
          • Offshore Wind
          • Uncertainty Quantification
          • Wildlife and Wind
          • Wind Data Archive and Portal
          • Wind Resource Characterization
        • Energy Equity & Health
        • Marine Energy
          • Environmental Monitoring for Marine Energy
          • Marine Biofouling and Corrosion
          • Marine Energy Resource Characterization
          • Testing for Marine Energy
          • The Blue Economy
        • Hydropower
          • Environmental Performance of Hydropower
          • Hydropower Cybersecurity and Digitalization
          • Hydropower and the Electric Grid
          • Materials Science for Hydropower
          • Pumped Storage Hydropower
          • Water + Hydropower Planning
        • Grid Integration of Renewable Energy
        • Geothermal Energy
      • Transportation
        • Bioenergy Technologies
          • Algal Biofuels
          • Aviation Biofuels
          • Waste-to-Energy and Products
        • Hydrogen & Fuel Cells
        • Vehicle Technologies
          • Emission Control
          • Energy-Efficient Mobility Systems
          • Lightweight Materials
          • Vehicle Electrification
          • Vehicle Grid Integration
      • Energy Efficiency
        • Appliance and Equipment Standards
        • Building Energy Codes
        • Building Technologies
          • Advanced Building Controls
          • Advanced Lighting
          • Building-Grid Integration
        • Building and Grid Modeling
        • Commercial Buildings
        • Federal Buildings
          • Federal Performance Optimization
          • Resilience and Security
        • Grid Resilience and Decarbonization
        • Residential Buildings
          • Building America Solution Center
          • Energy Efficient Technology Integration
          • Home Energy Score
        • Energy Efficient Technology Integration
      • Electric Grid Modernization
        • Emergency Response
        • Grid Analytics
          • AGM Program
          • Tools and Capabilities
        • Grid Architecture
        • Grid Cybersecurity
        • Grid Energy Storage
        • Grid Resilience and Decarbonization
          • Earth System Modeling
          • Energy System Modeling
        • Transmission
        • Distribution
    • National Security
      • Chemical & Biothreat Signatures
        • Contraband Detection
        • Explosives Detection
        • Pathogen Science & Detection
          • Threat-Agnostic Biodefense
      • Cybersecurity
        • Discovery and Insight
        • Proactive Defense
        • Trusted Systems
      • Nuclear Material Science
      • Nuclear Nonproliferation
        • Global Nuclear & Radiological Security
        • Nuclear Explosion Monitoring
        • Nuclear Forensics
        • Radiological & Nuclear Detection
        • Ultra-Sensitive Nuclear Measurements
      • Stakeholder Engagement
        • Disaster Recovery
        • Global Collaborations
        • Legislative and Regulatory Analysis
        • Technical Training
      • Systems Integration & Deployment
        • Additive Manufacturing
        • Deployed Technologies
        • Rapid Prototyping
        • Systems Engineering
      • Threat Analysis
        • Advanced Wireless Security
          • 5G Security
          • RF Signal Detection & Exploitation
        • Climate Security
        • Grid Resilience and Decarbonization
        • Internet of Things
        • Maritime Security
    • Data Science & Computing
      • Artificial Intelligence
      • Graph and Data Analytics
      • Software Engineering
      • Computational Mathematics & Statistics
      • High-Performance Computing
      • Visual Analytics
    • Lab Objectives
    • Publications & Reports
    • Featured Research
  • People
    • Inventors
    • Diversity & Inclusion
    • Lab Leadership
    • Lab Fellows
    • Staff Accomplishments
  • Partner with PNNL
    • Academia
      • Distinguished Graduate Research Programs
      • Internships
      • Visiting Faculty Program
      • Joint Appointments
      • Joint Institutes
      • Linus Pauling Distinguished Postdoctoral Fellowship
      • Minority-serving Institutions
    • Community
      • Regional Impact
      • STEM Education
        • Resources
        • Student STEM Ambassadors
        • STEM Ambassadors in the Classroom
      • Philanthropy
      • Volunteering
    • Industry
      • Available Technologies
      • Industry
      • Industry Partnerships
      • Licensing & Technology Transfer
      • Entrepreneurial Leave
  • Facilities & Centers
    • All Facilities
      • Atmospheric Radiation Measurement User Facility
      • Electricity Infrastructure Operations Center
      • Energy Sciences Center
      • Environmental Molecular Sciences Laboratory
      • Grid Storage Launchpad
      • Institute for Integrated Catalysis
      • Interdiction Technology and Integration Laboratory
      • PNNL Seattle Research Center
      • PNNL-Sequim
      • Radiochemical Processing Laboratory
      • Shallow Underground Laboratory

E4D

  • Team
  • Highlights
  • Applications
    • Electrical Resistivity Tomography
    • Spectral Induced Polarization
  • Get E4D
  • User Guide

E4D Team

Developers and Users

Tim C. Johnson is a computational scientist and expert in E4D subsurface imaging.

Tim C. Johnson is a computational scientist in subsurface geophysical imaging and interpretation related to complex environmental challenges and energy applications. He pioneered the development of E4D-RT, a real-time, four-dimensional subsurface imaging software that allows scientists to “see” subsurface processes and solutions in real time. Tim earned his Ph.D. in Geophysics at Boise State University.

 

Computational Scientist Judy Robinson

Judy Robinson is a computational scientist with field and numerical modeling experience in geophysical methods. Her work focuses on joint inversion using flow and transport models with electrical resistivity imaging to determine the feasibility of field electrical imaging. She has expertise in analyzing complex resistivity data and in joint physical and geochemical interpretations using corroborating field and lab datasets. She is an E4D developer and maintains the user guide. Judy earned her Ph.D. in Environmental Science at Rutgers University-Newark.

 

Data scientist Piyoosh Jaysaval

Piyoosh Jaysaval is a data scientist with experience in computational geophysics. His research focuses on developing numerical modeling and inversion methods for electromagnetic (EM) and seismic wave propagation in the 2D/3D earth. He has developed several large-scale novel forward modeling and inversion methods, with the main objective of computing results that are more accurate or reducing total modeling and inversion times. Piyoosh earned his Ph.D. in Geophysics at the University of Oslo, Norway.

 

Geophysicist Yue  Zhu

Yue Zhu is a geophysicist whose research interest focuses on numerical modeling and inversion of geophysical data including gravity, magnetic, and electromagnetic fields. She is passionate about the application of computational mathematics in geophysics and development of open-source high performance geophysical inversion codes. Yue earned her Ph.D. in Geophysics at the University of Utah.

 

Earth Scientist Jeff Burghardt

Jeff Burghardt is an earth scientist focusing on experimental and computational geomechanics. Since joining PNNL in 2016, his/her work has focused primarily on geologic carbon sequestration and enhanced geothermal systems. Jeff's research interests include hydraulic fracturing, induced seismicity, subsurface stress measurement and estimation, chemical/mechanical coupling, rock mechanics, fracture mechanics, and multiphysics modeling. Jeff holds a Ph.D. in Mechanical Engineering at the University of Utah.

 

Earth scientist Yilin Fang

Yilin Fang is an earth scientist on PNNL's Computational Subsurface Hydrology Team. She earned her Ph.D. in Engineering at Hohai University.

 

 

In addition, these PNNL users support the development of the E4D code:

Xingyuan Chen

Mark Rockhold

Chris Strickland

Mike Friedel

Parker Sprinkle

Adam Mangel

Dory Linneman

Jon Thomle

Contacts

Tim C. Johnson
Computational Scientist
tj@pnnl.gov
509-372-4715
Judy Robinson
Computational Geophysics Team Leader; Advisor, RemPlex
judith.robinson@pnnl.gov
509-372-6452
David Judi
Director, Earth Systems Science
david.judi@pnnl.gov
509-372-6147

PNNL

  • Get in Touch
    • Contact
    • Careers
    • Doing Business
    • Environmental Reports
    • Security & Privacy
    • Vulnerability Disclosure Program
  • Research
    • Scientific Discovery
    • Sustainable Energy
    • National Security
Subscribe to PNNL News
Department of Energy Logo Battelle Logo
Pacific Northwest National Laboratory (PNNL) is managed and operated by Battelle for the Department of Energy
  • YouTube
  • Facebook
  • Twitter
  • Instagram
  • LinkedIn