BSFZBlake Spur Fracture Zone
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They observed similar geologic characteristics in both the BSFZ and the offshore region, which is characterised by active folding and thrusting of the Upper Miocene to Quaternary sedimentary cover.
During the cruise, ten single-channel sparker seismic profiles were acquired along and across the BSFZ. Six units were identified in the seismic profiles, which show a regional erosive upper boundary in the shallow areas that becomes concordant with the lower units in the centre of the basin.
The deep tectonic structure of the BSFZ, which is characterised by blind thrusts, still remains an open issue.
Sites 1 to 5 were designed to measure the deformation along the Crevillente Fault, whereas sites 6 to 11 were designed to measure the deformation along the BSFZ. Sites 6 and 7 are located to the north of the fault zone, sites 9 and 10 are located on the Benejuzar and Guardamar anticlines, and sites 8 and 11 are located to the south of the fault zone.
In addition, a 30 km long high-precision levelling profile was set up along the eastern Bajo Segura Basin to quantify the vertical uplift associated with the BSFZ (Fig.
These three parts of the BSFZ are bounded by the NW-SE trending San Miguel de Salinas, Torrevieja and Guardamar faults, which have been interpreted as transfer faults associated with the Bajo Segura thrust (Alfaro et al., 2002a).
Active tectonic and palaeoseismic studies on blind faults are complex, especially in areas with low to moderate seismic activity such as the BSFZ. Therefore, vertical displacements of geological and geomorphological markers are the only data that can be used to estimate long-term slip rates.