Methods

A sequence of 13 parallel lines trending E-W, named BS27 to BS39 from, have been recorded with the SBP along the area, between 10:15W, 37N and 10W, 36:40N (Fig. 9). Where the active deformation was detected, coring stations were performed (Fig. 10). The CHIRP profiles, ranging from 5 to 7.5 miles length, were firstly spaced every 2 miles, and from 36:48N, they were spaced every 1 mile and systematically shifted l mile towards the east in order to follow the structural trend. A longitudinal line trending NNE-SSW and 17 miles long (named BS42) was acquired in order to correlate all the transverse lines. A parallel longitudinal line (BS41) unfortunately had to be stopped just at its beginning because the weather conditions become too rough for good acquisition. To maximize the resolution of the SBP data, all these lines were run at an average speed of 2.5-3 knots, using a trig rate of 2 sec. The maximun penetration achieved was around 60 m (depth calculations have been made assuming a sound speed of 1500 m/s), while the average penetration was around 35 m.

Figure 10: BS98. Cores locations.