Update home for Field Geophysical Software Suite that accompanies

Introduction to Applied Geophysics: Exploring the Shallow Subsurface,

by Burger, Sheehan, and Jones

View the help topics for the software (includes some FAQs)

Errata from the textbook are here.

Patches for Mac versions of GravMag and Refract:

• GravMag patch to version 1.0.7 (June 2009)
• Refract patch to version 1.0.5 (June 2009)

Patches for Windows versions of software are not yet available. When they are available, they will be posted here.

Known issues:

All:

• On occasion files saved from a code cannot be reopened. Workaround: Add .txt to the filename. This should force the file to be recognized by all FGSS codes. If you edit a file, be sure it is saved as plain text (not .rtf, or rich text, or MS Word .doc).
• Preferences are not saved. This was originally by design as use in classrooms or from CDs was envisioned.

GravMag:

• Erroneous behavior when changing from meters to kilometers if section width was unchanged from opening. Workaround: Just change the width of the section (even a trivial change) before changing the units the first time.
• Exporting while units are km and not m results in a file saved as though km were m.Workaround: Set units to meters before saving files.
• Occasionally GravMag will lock up in an infinite loop because of a bug in part of the code determining where to place the label in the section view. Workaround: none. Instructors who have adopted the book may contact me directly for a new version. Mac users should obtain the updater (above).
• Elevations of magnetics points are negative of where they should be. Workaround: Assume that the z column in the Magnetic Data window is positive down.
• Changing the preference to set the magnetic field manually produces a crash if the Magnetics Data window is not open. Workaround: Open the data window before changing this preference.
• Changing the preference to show a larger number of significant digits has no immediate effect. Workaround: set this preference prior to working with data files (model values will update as soon as the model is changed or recalculated)

Refract:

• (bug only in v 1.0.2 - 1.0.5): Data saved with uncertainties will be read in incorrectly: the errors for the forward shot will be swapped with the observations for the reversed shot. Fixed in 1.0.6. Workaround: If you have a saved data file, say Data1, read it in and then save it as Data2. When you read Data2, everything will be correct.
• If a reversed time pick is present but the forward pick is absent, then changing the time units will not change the value for the reversed time pick. Workaround: Set the time units before entering all your values (or make sure that you have picks for the forward shot at each geophone picked for the reverse shot).
• Changing the number of geophones when the data window is open will lead to a crash. Workaround: Set your number of geophones before opening the Data window.
• Changing the shot location does not result in updated data points on the Plot Window. Workaround: Editing anything in the data window will force an update in the polt window.
• Hiding Model Points in the Plot Window doesn't stick (points show up again after changing the model. No workaround other than rehiding the model points when you really need them to be hidden.
• Model files overwrite shot offsets, etc., without user confirmation. Workaround: When reloading exisiting models and data, load the model first and then the data.
• Data files are saved in the currently used units, and read in the currently used units, so data could be misread if different units were chosen between the save and open commands. Workaround: When opening a data file, set the time units to match what was used when the data file was saved.
• Cannot click on the angle of the top layer to change it after reading in a model of more than 2 layers when previously only had one layer. Workaround: Select another parameter and use tabs or shift-tabs to navigate to the angle.
• Changing the number of the first geophone in the preferences leads to a crash. No workaround.
• If the Model from Plot operation makes a nonsense structure (e.g., with layer boundaries crossing one another), there is no warning in the upper right of the Model Window. Workaround: Aside from recognizing such a mess in the Section Window, Updating Times and Plots will show the warning.
• Negative values for shot offset produce aphysical answers for some arrivals. Workaround: Don't do this, or just ignore the obviously aphysical arrivals.
• RMS misfit is not updated when loading a model or data. Workaround: Force the model times to be recalculated (usually just selecting a model parameter and tabbing out will enable the button)
• Rare nonresponsive behavior on drawing a section profile. Workaround: None other than leaving the section window closed. This is exceptionally rare in Refract (equivalent bug in GravMag was more serious)

The geophysical software suite is cross platform, behaving the same on Windows, Macintosh, and Linux OSes.

Please send mail to cjones@cires.colorado.edu if you encounter any problems or have suggestions.

C. H. Jones | CIRES | Dept. of Geological Sciences | Univ. of Colorado at Boulder

Last modified at October 20, 2009 11:58 AM