Abstract
The development of landscapes can be described phenomenologically as the outcome of the operation of a few simple fundamental principles amongst which the Antagonism Principle is the most important one (). It states that there are two types of processes active in the formation of a landscape at the same time: the endogenic (tectonic) and the exogenic (meteoric) processes. Generally, these two processes more or less balance each other so that a landscape represents the temporary dynamic steady state in a complex open, nonlinear system. If one of the external parameters is changed, the steady state is usually re-established by a corresponding continuous change of the other parameters (process-response theory). However, it is well known that the dependences between various landscape parameters may become multivalued at singularities, such as junctions, cusps etc. (); in that case, small random perturbations can send the system from one branch of the process-response curve to another: a natural disaster occurs. Thus, anytime the “equilibrium” in a landscape is disturbed, humans experience this as a disaster.
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