SeisImager is a versatile geophysical software suite developed by Geometrics, Inc., a pioneer in seismic instrumentation, designed for processing and interpreting seismic refraction and surface wave data in geotechnical, environmental, and engineering applications. It supports both active and passive seismic surveys to model subsurface velocity structures, estimate S-wave (Vs) and P-wave (Vp) profiles, and generate 2D/3D cross-sections for site characterization. The software is integral to workflows using Geometrics’ seismographs like the Atom, Geode, and Strataseis systems, enabling rapid analysis of soil layers, bedrock depths, and rippability for construction, mining, and hazard assessment. SeisImager emphasizes user-friendly wizards, quality control (QC) tools, and integration with field hardware for seamless data import from SEG-2 or SEG-Y formats.

The suite includes specialized modules:

  • SeisImager/2D: Refraction tomography and reciprocal method analysis.
  • SeisImager/SW: Multichannel analysis of surface waves (MASW) for Vs profiling, including 1D/2D modeling and passive noise processing.
  • SeisImager/3D: Advanced 3D refraction and reflection modeling for complex sites.
  • SeisImager/PSLog: Downhole and crosshole seismic logging for borehole data.

It runs on Windows (32/64-bit) and iOS (via the SeisImager app for mobile data preview), with a free Lite version bundled with Geometrics seismographs for basic field use.

Key Features

  • Refraction Analysis: Time-term inversion, reciprocal method, and optimized tomography for layered velocity models; handles lateral variations and low-velocity zones.
  • Surface Wave Processing: Active (MASW) and passive (SPAC, ReMi) methods to derive Vs profiles; dispersion curve inversion with customizable parameters.
  • Modeling and QC: Forward modeling of velocity models, waveform filtering, shot gather visualization, and correlation with borehole data (e.g., SPT N-values).
  • Visualization & Export: 2D cross-sections, Vs-depth plots, and wave propagation movies; exports to PDF, CSV, or Surfer/Surfer Cloud for reporting.
  • Applications: Geotechnical site investigations, groundwater mapping, earthquake engineering (e.g., Vs30 for seismic hazard zoning), and environmental remediation.