QGIS is a widely used open-source geographic information system. DDLAFS is a specialized plugin in Python to solve thematic problems. The plugin is designed as a set of functions allowing to calculate the dominant directions of the regional active fault system ψi. The estimation of the dominant directions of the local active fault system is given within a circular area ΔR, where R is a user-defined radius. The centres of regions ΔR should be represented by a set of point objects {g}. These may be epicentres of main shocks, seismogenic nodes, regular grid points, etc. If {g(M)} is represented by data on seismic events, R(g) can be determined depending on the magnitude M of a certain earthquake. The plugin provides an estimate of R(M) using the dependence [11]. For one area, n dominant directions can be determined, each of which corresponds to an empirical value of the probability density distribution of azimuths of active faults, {ψi, pi | i = 1, … n; Σpi = 1}.
The DDLAFS plugin is designed as part of an anisotropic seismic model in terms of macroseismic intensity [6].

Igor V. Emelyanov
Student 3-d year, Department of Geographic Information Systems,
MIREA — Russian Technological University
78, Vernadsky Avenue, Moscow, 119454, Russia
e-mail emelyanov.i.v@edu.mirea.ru

Anastasia K. Nekrasova
Candidate of Physical and Mathematical Sciences,
Principal Researcher
Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences
84/32, Profsoyuznaya str., Moscow, 117997, Russia
Postgraduate Program Lecturer of the Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
10 build. 1, Bolshaya Gruzinskaya str., Moscow, 123242, Russia
е-mail: nastia@mitp.ru
ORCID: 0000-0003-1639-1088

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