Hdef is designed to calculate displacements, strains, and stresses for various geologically relevant sources in an elastic half-space (hence, Halfspace deformation). The currently available sources are:
- Point dislocations (shear and tensile)
- Rectangular dislocations (shear and tensile)
- Triangular dislocations (shear and tensile)
- Point volume change (Mogi) sources
Hdef also includes several programs that I wrote to complement and contextualize the half-space outputs (so in that sense, maybe Hdef stands for "Herman" deformation). Actually, I got tired of looking up and recalculating things like plate velocity vectors, earthquake seismic moments, etc., so I wrote programs to have these results at my fingertips. These are included in Hdef, and I hope you find them useful as well.
I have used the codes in Hdef to make calculations for several peer-reviewed publications, and many other people have used Hdef for their own applications. However, I cannot guarantee that there are no bugs. If you think you have found a bug, please report it to me at matthew.w.herman@gmail.com
Please see INSTALL.md for directions on how to download and install Hdef.
Tutorials can be found at my website.
Man pages for most of the programs and some of the scripts are in the man/ directory.
Hdef is distributed under the MIT license. Please see LICENSE file.
At a minimum, please cite the Hdef code with the following DOI: https://doi.org/10.5281/zenodo.3894137, as well as the following papers:
Herman, M.W., Furlong, K.P., Hayes, G.P., Benz, H.M. (2016). Foreshock triggering of the 1 April 2014 Mw 8.2 Iquique, Chile, earthquake. Earth and Planetary Science Letters 447, 119-129.
Herman, M.W., Govers, R. (2020). Locating fully locked asperities along the South America subduction megathrust: a new physical inter‐seismic inversion approach in a Bayesian framework. Geochemistry, Geophysics, Geosystems 21, e2020GC009063.