Articles | Volume 12, issue 11
Research article
12 Nov 2021
Research article |  | 12 Nov 2021

Basin inversion: reactivated rift structures in the central Ligurian Sea revealed using ocean bottom seismometers

Martin Thorwart, Anke Dannowski, Ingo Grevemeyer, Dietrich Lange, Heidrun Kopp, Florian Petersen, Wayne C. Crawford, Anne Paul, and the AlpArray Working Group

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Cited articles

Afilhado, A., Moulin, M., Aslanian, D., Schnürle, P., Klingelhoefer, F., Nouzé, H., Rabineau, M., Leroux, E., and Beslier, M.-O.: Deep crustal structure across a young passive margin from wide-angle and reflection seismic data (The SARDINIA Experiment) – II. Sardinia's margin, B. Soc. Geol. Fr., 186, 331–351,, 2015. 
AlpArray Seismic Network: AlpArray Seismic Network (AASN) temporary component, AlpArray Working Group, Other/Seismic Network [data set],, 2015. 
Alvarez, W., Franks, S. G., and Nairn, A. E. M.: Palaeomagnetism of Plio-Pleistocene Basalts from North-west Sardinia, Nature Physical Science, 243, 10–11,, 1973. 
Bache, F., Olivet, J. L., Gorini, C., Aslanian, D., Labails, C., and Rabineau, M.: Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin), Earth Planet. Sc. Lett., 292, 345–356,, 2010. 
Baroux, E., Béthoux, N., and Bellier, O.: Analyses of the stress field in southeastern France from earthquake focal mechanisms, Geophys. J. Int., 145, 336–348,, 2001. 
Short summary
We analyse broadband ocean bottom seismometer data of the AlpArray OBS network in the Ligurian Basin. Two earthquake clusters with thrust faulting focal mechanisms indicate compression of the rift basin. The locations of seismicity suggest reactivation of pre-existing rift structures and strengthening of crust and uppermost mantle during rifting-related extension. Slightly different striking directions of faults may mimic the anti-clockwise rotation of the Corsica–Sardinia block.