Contenu du sommaire

Abstract. — The pediment slopes, in south french Préalpes, have a parabolical concavity. The declivity is in correlation with altitude and local rainfalls. They are very steady balanced slopes.

Abstract. — We ought to distinguish three sismic regions in the Western Alps. 1° The Briançonnais arc. Poorly deep focuses (30-40 km) are plumb over the orogene thickest part. Intensity is medium. 2° The Piemontese arc. Focuses are settled a little deeper (40-50 km), west side of the Ivea gravity crest, and they fall in with the overthrusted "Schistes lustrés". The dangerous Ligurian zone belongs to this arc. 3° The outer sismic regions. The rectilinear Chablais-Tricastin axis, on one hand, with superficial focuses ; Low Durance swarm, with pyrenean orientation, on the other hand. Therefore we do not notice, actually, any préalpine seismic arc.

Summary. — Hydrological comportments are settled by studies of springs and running dry curveds and hydrological balance.

Abstract. — The forms along which the French economic and social system has developed, together with the re-deployment of the big firms — either help or corrected by goverment intervention — are combining to lay the foundations of a new geography of the important territorial imbalances but also of another regional distribution of demographic structures and behaviours. The historical significance of such elements as the French « croissant fertile » (high-birth rate area) is becoming clearer as a matter of consequence, while the limits of the policy of regional development are being made more easily perceptible.

Abstract. — Albenga' Plain is a tectonical coastal basin filled with marine and continental pliocene sediments. During the Quaternary, the most important fact is valley cutting and terraces' building, under the control of neotectonical movements and climatical fluctuations. The evolution of the low plain and coast is very fast during historical times.