Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.146...74c&link_type=abstract
Geophysical Journal International, Volume 146, Issue 1, pp. 74-97.
Astronomy and Astrophysics
Astronomy
10
Crustal Structure, Expanding Spread Profile (Esp), North Ligurian Sea, Ocean-Continent Boundary, Onland Recording
Scientific paper
Data from a new deep-penetration seismic reflection line (LISA cruise 1995), onland seismic recording (LISA) and marine ESPs (expanding spread profiles, CROC II cruise 1981) are integrated to study the crustal structure of the north Ligurian basin. The correlation of these different seismic data, located along an Antibes-Ile Rousse transect, provides accurate information on the nature of the crust. On the Provençal margin, the multichannel seismic (MCS) profile LISA01 shows a major step in the basement. This structure is associated with a crustal change, corresponding to the ocean boundary. On the Corsica margin, we do not observe such a structure and the ocean boundary is constrained by magnetic anomalies. These anomalies are identical to those observed on the Provençal margin above the main basement structure. On the MCS line, the Messinian salt and the bottom water multiple obscure the crustal image below 7s two-way traveltime (TWTT). Nevertheless, the ESPs provide information about the crust below 7s TWTT. These ESPs were reprocessed and analysed by matching traveltime and amplitude variations in the X-T and τ-p domains. The main result is the identification of a transitional zone on the continental margin (Provençal and Corsica margin) characterized by a layer with velocities of 7.2-7.3kms-1 in the lower crust. Recordings from land stations on the Corsica margin define the geometry of this layer. In the centre of the basin, the oceanic crust is about 6km thick. From the Corsica margin to the centre of the basin, the Moho depth decreases from 18 to 13km. The velocity model deduced from offshore data is consistent with the ESP velocity model and MCS line LISA01. The combined analysis of these data allows us to propose a new boundary of the oceanic crust in the north Ligurian basin.
Béthoux Nicole
Contrucci Isabelle
Mauffret Alain
Nercessian Alexandre
Pascal G.
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