Tectonic and Hydrothermal Activities in Debagh, Guelma Basin (Algeria)

Figure 4

Examples of observed recent tectonic evidences: (a, b) fissured ridge at HD. Travertine precipitates from hot waters that emerge along the axial ridge making up the cone. They are part of a radically different internal structure than the terraced mound deposits; (c) vertical transverse fracture; (d) picture showing surface rupture and broken columns in roman career probably related to an earthquake occurrence; the arrow indicates the position of fracture; (e, f) recent normal faults affecting the Pliocene deposits.