Interpex is a software company dedicated to the production of high quality software for the processing, interpretation and display of geophysical data.

 P.O. Box 839 • Golden • Colorado • 80402 • USA


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  • Designed for Windows 9x, NT and XP 

  • Protected with convenient USB key.

  • Supports EMGS data formats but can be adapted to other formats.

  • Supports import of Tx position, Rx data and multiple current records for TX.

  • Displays E-fields, H-fields, both or single or multiple components.

  • Supports automatic generation of current switch markers.

  • Supports interactive Lissajous figure determination of receiver orientation angle.

  • One-click synchronization of Tx current and Rx field displays

  • Export single transients or a range.

  • Documentation consists of a detailed Windows Help, a PDF manual and a PowerPoint tutorial



Marine EM Data Processing

Designed for Windows 9x and NT  

MarineQaQc is an interactive marine electromagnetic Quality Control/Quality Assurance and data processing software package currently adapted to the EMGS acquisition system but which can be adapted to other marine and possibly land-based EM acquisition systems.

To evaluate this package, please contact Interpex to set up a demonstration: internal e-mail or send to

Features Include:

  • Supports EMGS format but can be adapted to other formats.
  • Imports Tx (ship) navigation, multiple current records and single receiver recording.
  • Displays Tx navigation, Tx Current and 6-component Rx data in separate windows.
  • Provides for a separate zoomed display of receiver data.
  • Displays E-fields, H-fields or both.
  • One-click synchronization of Tx current and Rx field displays.
  • Automatic generation of current switch markers with powerful editing capabilities to account for drift.
  • Interactive Lissajous figure determination of receiver orientation angle.
    Bathymetry import and display.
  • Point & click selection of Rx display from map.

MarineQaQc™ receiver window screen showing 6-component E- and H-field data.

Data import steps:

  • Import of Tx navigation from EMGS supplied TX file.

  • Import of current from EMGS supplied ANT files.

  • Import of receiver position and attributes from EMGS supplied files.

  • Import of system response information from EMGS supplied files.

  • Import of receiver data stream from raw, binary or processed data files from EMGS.

  • Possibility to adapt to other formats at modest additional cost.


MarineQaQc™ Tow line position dialog box.

Pointing and clicking on the towline display on the map selects a position for display as shown above. Both towed fish and stationary receivers are supported.

Transmitter current and receiver E/H field data displays can be easily synchronized to show the same horizontal axis with a single click.

Stationary receivers are dropped from the ocean surface and arrive on the ocean floor at an arbitrary and unknown orientation. The orientation can be found by selecting an appropriate section of receiver data and finding the true orientation of the receiver by interacting with the Lissajous figure display of the E- and/or H-field data. E will be parallel to the line from Rx to Tx while H will be perpendicular.

Use the mouse and the Lissajous figure of the selected receiver data range to find true receiver orientation.

Receiver locations are imported automatically with user override from the EMGS supplied receiver location files. The location can also be edited manually during processing. 

Receiver location dialog allows for changes to the receiver location data.

Files can be stored in a single directory or in a complex directory structure where each file type is in a separate folder. An interactive dialog allows for editing this structure, which can be saved for later use. A browse button allows the directory to be selected interactively.

Directory structure for files including navigation, data, position, calibration, current MQC document and SEG-Y files.

Right-clicking on a marker while pointing at one of the data curves allows you to extract the transient at that location for viewing, further processing and export. Most windows have odometers on the status bar which show the cursor location and information about an object at which it is pointing.

The status bar shows the cursor position, the marker at which the cursor points (if any), the time value for the marker and the component at which the cursor points.

The extracted transient can be viewed on linear or log scales, and can be further processed. The spectrum is also available for viewing.

Extracted transient from right-clicking on a marker.

Spectrum of the extracted transient.

The graphics can be printed, and DXF, CGM and WMF graphics files are available for export.



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