Second release (Mac version) June 2021, v0.9.5 (Recompiled 5/24)
Download Mac version (5.5 Mb zipped)
Download Windows version (18.4 Mb zipped)
Program for exploring individual first-motion earthquake focal mechanisms. The main point of this is to allow a user to interactively explore how changing parameters affects how well a collection of first-motion polarity picks are fit. Picks in FOCMEC format can be input, or picks can be added by hand. If a velocity model is input along with stations distances from the event (by hand), user can also explore the effect of error in event depth on focal mechanisms. A misfit value is calculated that downweights stations near a nodal plane (the width of the downweighting can be controlled by the user).
Known bugs: Some rotations by hand will produce peculiar reversals in mechanism polarity and a few combinations will produce some incorrect results. If you come across misbehaviors, let me know.
Apple has made it increasingly challenging to use non-developer-program authored software. So you will probably see a "cannot open because Apple cannot check for malware" message when opening the application. You can then go to System Settings>Privacy & Security; under Security there should be a button that would allow you to open the software.
If interested in Linux version, let me know.
v 0.9.5 fixes issues printing or saving as a graphics file and some peculiarities if changing polarity in the pick window.
Please send mail to cjones@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 December 26, 2025 11:17 AM