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A learning sequence with interactive computational modelling based on Modellus designed for introductory seismology university courses is discussed. The sequence considers earthquake generation mechanics and applies Modellus to determine the evolution of the friction coefficient as given by the rate-and-state friction law governing the frictional instabilities that give rise to earthquakes. Laboratory experiments indicate that the rate-and-state friction law applies not only to rocks but also to some metals, paper, wood, and some plastics. The use of Modellus allows for a parametric study of the equations and for students to create the mathematical models on their own, which ultimately helps them achieve a better understanding of the complex earthquake phenomena. [ABSTRACT FROM AUTHOR]