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Geophysical Research at UBC

Lindsey Heagy
December 17, 2014

Geophysical Research at UBC

An overview of research in geophysics happening at the Geophysical Inversion Facility, including developments on SimPEG (http://simpeg.xyz)

Lindsey Heagy

December 17, 2014
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  1. Geophysical Research at UBC Lindsey Heagy, Seogi Kang & Rowan

    Cockett Geophysical Inversion Facility University of British Columbia http://gif.eos.ubc.ca/
  2. Hydrologic problem We want to know the distribution of intruded

    seawater saturation (This is C alifornia!)
  3. Forward problem: Ground Loop EM dM Conventional ➔ Time domain

    EM (TEM) ➔ 1D inversion (conventional) Why not? ➔ Frequency domain EM ➔ Multi-dimensional inversion
  4. Monitoring Exploration Electromagnetics Induced Polarization Direct Current Resistivity Magnetotellurics Survey

    Design Fluid Flow Physics Simulation Discretization Optimization Integrating information Visualization Education Things & Stuff
  5. Our questions. What are the challenges that you face? -

    exploration? - monitoring? Where might geophysics fit in? - physical properties & contrasts? Where has geophysics been useful? or not? why?
  6. Messages 3D inversions are very non-unique problem ➔ Not “one-click”

    but iterative procedures We need flexibility on our model parameters ➔ Can be realized by mapping function:
  7. Anomalous responses Optimal parameters: ➔ 0.1-10 ms; 1-100 Hz (t

    and f) ➔ 0-200 m (distance from the center)