FN Archimer Export Format
PT J
TI Basin inversion: reactivated rift structures in the central Ligurian Sea revealed using ocean bottom seismometers
BT 
AF Thorwart, Martin
   Dannowski, Anke
   Grevemeyer, Ingo
   Lange, Dietrich
   Kopp, Heidrun
   Petersen, Florian
   Crawford, Wayne
   Paul, Anne
AS 1:1;2:2;3:2;4:2;5:1,2;6:2;7:3;8:4;9:;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 CAU, Institute of Geosciences, Christian-Albrechts-Universität zu Kiel, 24105 Kiel, Germany
   GEOMAR, Marine Geodynamics, Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
   IPGP, Laboratoire de Géosciences Marines, Institut de Physique du Globe de Paris, Paris, 75238 Cedex 5, France
   Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, UGE, ISTerre, 38000 Grenoble, France
C2 UNIV KIEL CAU, GERMANY
   IFM GEOMAR, GERMANY
   IPGP, FRANCE
   UNIV GRENOBLE ALPES, FRANCE
IN DOAJ
IF 3.923
TC 3
UR https://archimer.ifremer.fr/doc/00678/79017/81416.pdf
   https://archimer.ifremer.fr/doc/00678/79017/89672.pdf
LA English
DT Article
CR ALPARRAY LEG1
BO Pourquoi pas ?
AB The northern margin of the Ligurian Basin shows notable seismicity at the Alpine front, including frequent magnitude 4 events. Seismicity decreases offshore towards the Basin centre and Corsica, revealing a diffuse distribution of low magnitude earthquakes. We analyse data of the amphibious AlpArray seismic network with focus on the offshore component, the AlpArray OBS network, consisting of 24 broadband ocean bottom seismometers deployed for eight months, to reveal the seismicity and depth distribution of micro-earthquakes beneath the Ligurian Sea. Two clusters occurred between ~10 km to ~16 km depth below sea surface, within the lower crust and uppermost mantle. Thrust faulting focal mechanisms indicate compression and an inversion of the Ligurian Basin, which is an abandoned Oligocene rift basin. The Basin inversion is suggested to be related to the Africa-Europe plate convergence. The locations and focal mechanisms of seismicity suggest reactivation of pre-existing rift structures. Slightly different striking directions of faults in the basin centre compared to faults further east and hence away from the abandoned rift may mimic the counter-clockwise rotation of the Corsica-Sardinia block during ~20–16 Ma. The observed cluster events support the hypothesis of strengthening of crust and uppermost mantle during rifting related extension and thinning of continental crust. 
PY 2021
PD NOV
SO Solid Earth
SN 1869-9510
PU Copernicus GmbH
VL 12
IS 11
UT 000720121800001
BP 2553
EP 2571
DI 10.5194/se-12-2553-2021
ID 79017
ER

EF