Fig. 1From: In-situ permeability of fault zones estimated by hydraulic tests and continuous groundwater-pressure observationsa Tectonic index map of the Median Tectonic Line (MTL) showing the ITA observatory location. b Arrangement of screen and gravel filter in Hole 1 with a stratigraphic section showing the fault zone structure between 470 and 570 m deep. c Cross section of the ITA observatory showing the internal structure of the MTL fault zone. d Arrangement of screen and gravel filter in Hole 2 with the results of the resistivity logBack to article page