Wide-angle deep seismic reflection profile (ALCUDIA Wide-Angle Transect)

The acquisition design included three lines of receivers, having a total length of ca. 350 km. The main line, ALCUDIA-WA, is ca. 310 km long strikes NE-SW to NNE-SSW, it is approximately perpendicular to the structural grain. A 40 km long line of receivers that trends NNW-SSE was deployed perpendicular to the Central System (CS) mountain range. Over 900 TEXANS (single component, digital recording seismic station) from the IRIS-PASSCAL Instrument Pool were deployed from the northern boundary of the Ossa-Morena Zone to the alpine thrust representing the southern boundary of the CS. The entire ALCUDIA-WA survey had a nominal shot and receiver spacing of 70 km and 400m, respectively. Five explosive sources, each one consisting in 1 TM of explosive, were placed in ~55m deep single boreholes, providing a signal rich in high frequencies resulting in shot records characterized by high signal-to-noise ratio. For this reason, these data can be qualified as a high-resolution wide-angle data set.