Isn't folding a very gradual tectonic process?
-
Compressional forces, like colliding tectonic plates, cause folding in "soft" rocks. But, even these rocks can have their limits. If the compressive force is suddenly increased the rock's elastic limit can be exceeded and the rocks behave as a brittle solid and snap. Also, rocks near the surface of the Earth tend to be more brittle than those found at greater depths. Further below the surface, higher temperatures and pressures cause the rocks to become more plastic. So compressional forces that create folds below the surface can cause fractures and faulting at the surface.
-
I DON'T THINK FOLDING LEAD TO EARTH QUAKE RATHER FOLDING IS CAUSED BY TO PARALLEL FORCES FROM SIMILAR DIRECTIONS CLASH RESULTS UP BENDING THE GROUND TO THE HIGHER PART AND MAKES FOLD .THIS MOSTLY OCCUR IN VOLCANIC AREAS. EXAMPLE FOLD MOUNTAINS OF ALPS, ATLAS MOUNTAIN IN NORTH AFRICA SPECIALLY ALGERIA AND MOROCCO.