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

Data sets

AlpArray Seismic Network (AASN) temporary component AlpArray Seismic Network

Rete Sismica Nazionale (RSN) INGV Seismological Data Centre

RESIF-RLBP French Broad-band network, RESIF-RAP strong motion network and other seismic stations in metropolitan France RESIF

Mediterranean Very Broadband Seismographic Network (MedNet) MedNet Project Partner Institutions

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.