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| Thorwart, Martin; Dannowski, Anke; Grevemeyer, Ingo; Lange, Dietrich; Kopp, Heidrun; Petersen, Florian; Crawford, Wayne; Paul, Anne; The Alparray Working Group,. |
| 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,... |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00678/79017/81416.pdf |
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| Gràcia, Eulàlia; Grevemeyer, Ingo; Bartolomé, Rafael; Perea, Hector; Martínez-loriente, Sara; Gómez De La Peña, Laura; Villaseñor, Antonio; Klinger, Yann; Lo Iacono, Claudio; Diez, Susana; Calahorrano, Alcinoe; Camafort, Miquel; Costa, Sergio; D’acremont, Elia; Rabaute, Alain; Ranero, César R.. |
| Large continental faults extend for thousands of kilometres to form boundaries between rigid tectonic blocks. These faults are associated with prominent topographic features and can produce large earthquakes. Here we show the first evidence of a major tectonic structure in its initial-stage, the Al-Idrissi Fault System (AIFS), in the Alboran Sea. Combining bathymetric and seismic reflection data, together with seismological analyses of the 2016 Mw 6.4 earthquake offshore Morocco – the largest event ever recorded in the area – we unveil a 3D geometry for the AIFS. We report evidence of left-lateral strike-slip displacement, characterise the fault segmentation and demonstrate that AIFS is the source of the 2016 events. The occurrence of the Mw 6.4 earthquake... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62427/66705.pdf |
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| Marjanovic, Milena; Singh, Satish C.; Gregory, Emma P. M.; Grevemeyer, Ingo; Growe, Kevin; Wang, Zhikai; Vaddineni, Venkata; Laurencin, Muriel; Carton, Helene; De La Pena, Laura Gomez; Filbrandt, Christian. |
| Oceanic transform faults and fracture zones (FZs) represent major bathymetric features that keep the records of past and present strike-slip motion along conservative plate boundaries. Although they play an important role in ridge segmentation and evolution of the lithosphere, their structural characteristics, and their variation in space and time, are poorly understood. To address some of the unknowns, we conducted interdisciplinary geophysical studies in the equatorial Atlantic Ocean, the region where some of the most prominent transform discontinuities have been developing. Here we present the results of the data analysis in the vicinity of the Chain FZ, on the South American Plate. The crustal structure across the Chain FZ, at the contact between... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00690/80171/83239.pdf |
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