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Basin inversion: Reactivated rift structures in the Ligurian Sea revealed by OBS 5
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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EMSO-Azores : Monitoring seafloor and water column processes at the Mid-Atlantic Ridge 5
Cannat, Mathilde; Sarradin, Pierre-marie; Blandin, Jerome; Ballu, Valérie; Barreyre, Thibaut; Chavagnac, Valérie; Colaco, Ana; Crawford, Wayne; Daniel, Romuald; Escartin, Javier; Legrand, Julien; Matabos, Marjolaine; Rommevaux, Céline; Roullet, Guillaume; Reverdin, Gilles; Sarrazin, Jozee.
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46444/46194.pdf
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Infragravity waves across the oceans 5
Rawat, Arshad; Ardhuin, Fabrice; Ballu, Valerie; Crawford, Wayne; Corela, Carlos; Aucan, Jerome.
Ocean infragravity (IG) waves are low-frequency waves generated along shorelines by incident seas and swell and with heights of the order of 1 cm in the open ocean. Despite these small amplitudes, they can be of much importance for ice shelf break up and errors in measurements of sea level by future satellite altimeters. A combination of numerical model results and in situ data is used to show that bottom pressure signals in the infragravity frequency band can be dominated by bursts of energy that travel across ocean basins, and can last for several days. Two particularly strong events recorded in 2008 are studied, one in the North-Pacific and the other in the North-Atlantic. It is shown that infragravity waves can travel across whole oceans basins with...
Tipo: Text Palavras-chave: Infragravity waves; DART; Global wave model.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00233/34465/32860.pdf
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