Alpes-de-Haute-Provence
Alpes-de-Haute-Provence (sometimes abbreviated as AHP; ; ; ), formerly until 1970 known as Basses-Alpes (, ), is a department in the Provence-Alpes-Côte d'Azur region of France, bordering Alpes-Maritimes and Italy to the east, Var to the sou ...
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
.
Geography
The village is located at 950m of altitude, at the end of a road, in the valley of
Coulomp
The Coulomp is a mountain river that flows through the Alpes-de-Haute-Provence department of southeastern France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions a ...
. The road leading to it continues along a semi-tarred trail to the hamlet of Chabrières.
The adjoining communities of Braux are Le Fugeret, Castellet-lès-Sausses, Saint-Benoît and Annot.
Bois du Fa to the north of the village.
Geology
The village is set on a local resurgence of
sandstone
Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...
dating from the
Oligocene
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that defin ...
(the same as Ann
ot) in the middle of
marl
Marl is an earthy material rich in carbonate minerals, Clay minerals, clays, and silt. When Lithification, hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae.
M ...
and
limestone
Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science) ...
of the
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...
and the
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...
.
Relief
* Crest of Clos Martin (1,522 m and 1,607 m);
* Rock of Pelloussis (1,340 m)
Environment
The commune counts 639 ha of woods and forests.
Natural and technological hazards
None of the 200 municipalities in the department is in a zero seismic risk zone. Braux is in zone 1b (low risk) according to the deterministic classification of 1991, based on historical
earthquake
An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they ...
s, and zone 4 (medium risk) according to the probabilistic classification EC8 of 2011. The municipality of Braux is also exposed to three other natural hazards:
* Forest fire,
* flood,
* Land movement: the municipality is almost entirely concerned by an average to high risk.
The commune of Braux is not exposed to any of the risks of technological origin identified by the prefecture.
No plan for risk prevention foreseeable natural (PPR) exists for the municipality and DICRIM are not.
The most sensitive earthquake in the commune is that of February 23, 1887, with a macro-seismic intensity of VII on the scale MSK and Imperia-Bussana for
epicenter
The epicenter (), epicentre, or epicentrum in seismology is the point on the Earth's surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.
Determination
The primary purpose of a ...
. Among the recent landslides and landslides, the most important ones are those of 1978 and 5 November 1994. One of 1994 concerns an area of 13 hectares on a thickness of 6 m, below the Rocher des Meules (Ravine de la Lauriere ), which had won several farms.