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Integrated software for structural analysis of fault-slip data

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T-TECTO 3.0 2014 Professional         Available soon !!!


T-TECTO is a computer program which enables fast and simple paleostress and kinematic analysis of heterogeneous and homogeneous fault-slip data using the Gauss method (Žalohar and Vrabec, 2007). The program is based on the classical philosophy of fault-slip data inversion which involves the concept of the best-fitting stress tensor. The defined compatibility measure and compatibility function verify the compatibility of a given stress tensor with observed fault-slip data. In order to constrain inversion results to mechanically acceptable solutions, the program additionally considers the ratio between the normal and shear stress on the fault plane, since it is assumed that the results of paleostress inversion should be in agreement with the Amonton's Law. The optimal solution for stress tensors that activated the observed faults is found by searching for the global and highest local maxima of the object function F defined as a sum of compatibility functions for all fault-slip data.


AmontonWin computer program... The reliability of T-TECTO was verified by the AmontonWin computer program which enables the direct modelling of fault-slip with respect to the defined stress and strain boundary conditions. This computer program is part of the T-TECTO 3.0 version and will not be released as a separate computer program.


T-TECTO is being used all over the world by structural geologists that come from USA, Brazil, Europe, Asia, Australia, etc...

T-TECTO is being developed at Faculty of Natural Sciences and Engineering in Ljubljana (Slovenia). The program is provided free of charge for academic, non-profit use.


See also: T-TECTO 3.0 details




Compatible with the World Stress Map...

T-TECTO 3.0 – the newest version of T-TECTO


In september 2009, the newest version T-TECTO 3.0 has been released. Numerous new functions allow a more detailed analysis of fault-slip data, earthquake focal-mechanisms, various fractures, extension veins, disjunctive foliations and other structures that form under high stress. T-TECTO 3.0 also allows a detailed analysis of the reliability of the solutions. The new functions include:

  • Determination of the maximum and minimum horizontal stresses.

  • Determination of the maximum horizontal shortening and extension.

  • Analysis of the relative vertical deformations.

  • Automatic optimization of the VGF parameters.

  • Visualization of the Multiple-slip mechanisms (MSM).

  • Visualization of the P and T quadrants and fields.

  • Cosserat extension of the MSM weighting factors determination.

  • Analysis of the reliability of the Cosserat relative microrotation parameter W (C).

  • Increased maximum number of faults (now with 2000 faults limitation)

T-TECTO 3.0 was designed to be compatible with the recommendations of the World Stress Map project. The World Stress Map (WSM) is the global compilation of information on the present-day stress field of the Earth's crust with 21,750 stress data records in its current WSM database release 2008. It is a collaborative project between academia, industry and government that aims to characterize the stress patterns and to understand the stress sources. In the World Stress Map different types of stress indicators are used to determine the tectonic stress orientation. They are grouped into four categories:

1. Earthquake focal-mechanisms.

2. Well bore breakouts and drilling-induced fractures.

3. In-situ stress measurements (overcoring, hydraulic fracturing, borehole slotter).

4. Young geologic data (from fault-slip analysis and volcanic vent alignments).

The T-TECTO will allow you to analyse your earthquake focal-mechanisms data and young geologic data (fault-slip data, various fractures, extension veins, disjunctive foliations and other structures that form under high stresses in the Earth's crust).


Go to the World Stress Map Project


See also the revised WSM Quality Ranking Scheme for Stress Orientations - Version 2008:


   http://dc-app3-14.gfz-potsdam.de/pub/quality_ranking/WSM_quality_ranking_2008.pdf (PDF table)

The following functions and procedures are available in the T-TECTO 3.0 Professional:


         Stereographic projections of faults, joints and beds.

         (Paleo)stress analysis of homogeneous and heterogeneous fault-slip data.

         Direct kinematic analysis  - the MSM method.

         Cosserat stress-strain analysis of fault-slip data (inverse methods).

         Cosserat kinematic analysis (direct MSM methods).

         Modelling of shear stress, direction of block movements and microrotations.

         Direct modelling of fault-slip (AmontonWin) in different stress and strain boundary conditions.

         Stereographic projections of homogeneous subsystems of faults.

         Mohr diagrams for symmetrical and asymmetrical stresses.

         Rotations of the faults, beds, joints (fractures) and lineations.

         Analysis of dispersions between the predicted and actual direction of slip along the faults.

         The Right Dihedra Method (Angelier and Mechler, 1977).

         Visualization of the Gauss object function.

         Stress and/or strain inversion of the earthquake focal-mechanisms data.

         Special analysis of faults with multiple lineation systems.

         Determination of the relative age of different tectonic phases.


T-TECTO 3.0 new graphic tools


The very usefull VGF method was improved and a new method for visualization of the Multiple-slip mechanisms was introduced in the T-TECTO 3.0. The visualization of the MSM is the tensorial version of the VGF method.


Other graphic functions in the T-TECTO 3.0 include:

  • Plotting poles to the fractures and faults.

  • Wulff net.

  • Tangent-lineation plots.

  • Maximum horizontal deformations.

  • Maximum horizontal stresses.

  • P and T quadrants and fields.

  • Graphs showing optimization of the VGF and inversion parameters.

The methods implemented in the T-TECTO computer program are described in the following articles:


ŽALOHAR, J., VRABEC; M., 2009. Kinematics and dynamics of fault reactivation: The Cosserat approach., Journal of Structural Geology, (doi:10.1016/j.jsg.2009.06.008)

ŽALOHAR, J., VRABEC, M., 2008. Combined (paleo)stress and kinematic analysis of fault-slip data: the Multiple-slip method., Journal of Structural Geology,


ŽALOHAR, J., 2008. Cosserat stress-strain analysis of heterogeneous fault-slip data with the Gauss method, 139 pp., Ph.D. thesis, University of Ljubljana. [PDF on request]  (Available only in Slovenian language).

ŽALOHAR, J., VRABEC, M., 2007. Paleostress analysis of heterogeneous fault-slip data: the Gauss method., Journal of Structural Geology 29, 1798-1810. (doi:10.1016/j.jsg.2007.06.009)

ŽALOHAR, J., 2001. Analysis and separation of tectonic paleostresses., 94 pp., University of Ljubljana. [PDF on request] (Available only in Slovenian language).