**GArcmB**

Tectonic Study Group

Kyoto University

Program Package ver. 1.2

DownloadUser's Manual (July 12, 2016) Program Package (April 9, 2016) |

The goodness of fit of a mixed Bingham distribution is evaluated by the
function, *L*(** X **), where

- Yamaji, A., Sato, K. and Tonai, S. (2010) Stochastic modeling for the stress
inversion of vein orientations: Paleostress analysis of Pliocene epithermal
veins in southwestern Kyushu, Japan.
*Journal of Structural Geology***32**, 1137-1146, doi:10.1016/j.jsg.2010.07.001 [Manuscript (Open File)]. - Yamaji, A. and Sato, K. (2011) Clustering of fracture orientations using
a mixed Bingham distribution and its application to paleostress analysis
from dike or vein orientations.
*Journal of Structural Geology***33**, 1148-1157, doi:10.1016/j.jsg.2011.05.006 [Manuscript (Open File)]. - Yamaji, A. (2016) Genetic algorithm for fitting a mixed Bingham distribution
to 3D orientations: a tool for the statistical and paleostress analyses
of fracture orientations.
*Island Arc***25**, 72-83, doi:10.1111/iar.12135 [This article is available freely from the journal's homepage].

The author thanks his colleagues and students for the comments on the early versions of the software. Publication of the software was financially supported by JSPS KAKENHI Grant Number 15H02141.

Atsushi Yamaji

Division of Earth and Planetary Sciences, Kyoto University

**Examples of successful and unsuccessful runs** (Delta g = 100)

**Explanation**

GArcmB is the freeware for the fuzzy clustering of 3D orientations and for the paleostress analysis of dilational fractures such as dikes and mineral veins. The software searches for the mixed Bingham distribution that best fits a set of orientation data through the real coded genetic algorithm. The number of clusters and that of stresses are evaluated by using Bayesian information criterion. The software runs on 64-bit operating systems (Windows, Mac and Linux).