Terrestrial Laser Scanner has been used to detect rock falls which have occurred in a limestone cliff during some years, in the difficult configuration of the Subalpine Chains. In a rock  wall of width 750m and height 200 m, 130 rock falls larger than 0.1 m³ have been detected for a period of 1180 days. The distribution of the rock fall volumes is well fitted by a power law, with an exponent which is compatible with the exponent found for the 120 km long cliffs of the Grenoble area. But the spatialtemporal frequencies given by the two analyses are very different. The number of rock falls larger than 1 m³, which occur per century and per hm², is about 150 times larger for the bedded limestone of Sequanian stage than for the massive limestones of Tithonian and Barremian stages.