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| Collot, Jean-julien; Sanclemente, Eddy; Nocquet, Jean-mathieu; Lepretre, Angelique; Ribodetti, Alessandra; Jarrin, Paul; Chlieh, Mohamed; Graindorge, David; Charvis, Philippe. |
| Whether subducted oceanic reliefs such as seamounts promote seismic rupture or aseismic slip remains controversial. Here we use swath bathymetry, prestack depth-migrated multichannel seismic reflection lines, and wide-angle seismic data collected across the central Ecuador subduction segment to reveal a broad similar to 55kmx50km, similar to 1.5-2.0km high, low height-to-width ratio, multipeaked, sediment-bare, shallow subducted oceanic relief. Owing to La Plata Island and the coastline being located, respectively, similar to 35km and similar to 50-60km from the trench, GPS measurements allow us to demonstrate that the subducted oceanic relief spatially correlates to a shallow, similar to 80kmx55km locked interplate asperity within a dominantly creeping... |
| Tipo: Text |
Palavras-chave: Seamount subduction; Interseismic coupling; Seismic imaging; Slow slip event; Megathrust earthquake. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00638/75038/75652.pdf |
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| Hetenyi, Gyorgy; Molinari, Irene; Clinton, John; Bokelmann, Gotz; Bondar, Istvan; Crawford, Wayne C.; Dessa, Jean-xavier; Doubre, Cecile; Friederich, Wolfgang; Fuchs, Florian; Giardini, Domenico; Graczer, Zoltan; Handy, Mark R.; Herak, Marijan; Jia, Yan; Kissling, Edi; Kopp, Heidrun; Korn, Michael; Margheriti, Lucia; Meier, Thomas; Mucciarelli, Marco; Paul, Anne; Pesaresi, Damiano; Piromallo, Claudia; Plenefisch, Thomas; Plomerova, Jaroslava; Ritter, Joachim; Rumpker, Georg; Sipka, Vesna; Spallarossa, Daniele; Thomas, Christine; Tilmann, Frederik; Wassermann, Joachim; Weber, Michael; Weber, Zoltan; Wesztergom, Viktor; Zivcic, Mladen; Abreu, Rafael; Allegretti, Ivo; Apoloner, Maria-theresia; Aubert, Coralie; Besancon, Simon; De Berc, Maxime Bes; Brunel, Didier; Capello, Marco; Carman, Martina; Cavaliere, Adriano; Cheze, Jerome; Chiarabba, Claudio; Cougoulat, Glenn; Cristiano, Luigia; Czifra, Tibor; D'Alema, Ezio; Danesi, Stefania; Daniel, Romuald; Dannowski, Anke; Dasovic, Iva; Deschamps, Anne; Egdorf, Sven; Fiket, Tomislav; Fischer, Kasper; Funke, Sigward; Govoni, Aladino; Groschl, Gidera; Heimers, Stefan; Heit, Ben; Herak, Davorka; Huber, Johann; Jaric, Dejan; Jedlicka, Petr; Jund, Helene; Klingen, Stefan; Klotz, Bernhard; Kolinsky, Petr; Kotek, Josef; Kuhne, Lothar; Kuk, Kreso; Lange, Dietrich; Loos, Jurgen; Lovati, Sara; Malengros, Deny; Maron, Christophe; Martin, Xavier; Massa, Marco; Mazzarini, Francesco; Metral, Laurent; Moretti, Milena; Munzarova, Helena; Nardi, Anna; Pahor, Jurij; Pequegnat, Catherine; Petersen, Florian; Piccinini, Davide; Pondrelli, Silvia; Prevolnik, Snjezan; Racine, Roman; Regnier, Marc; Reiss, Miriam; Salimbeni, Simone; Santulin, Marco; Scherer, Werner; Schippkus, Sven; Schulte-kortnack, Detlef; Solarino, Stefano; Spieker, Kathrin; Stipcevic, Josip; Strollo, Angelo; Sule, Balint; Szanyi, Gyongyver; Szucs, Eszter; Thorwart, Martin; Ueding, Stefan; Vallocchia, Massimiliano; Vecsey, Ludek; Voigt, Rene; Weidle, Christian; Weyland, Gauthier; Wiemer, Stefan; Wolf, Felix; Wolyniec, David; Zieke, Thomas. |
| The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing... |
| Tipo: Text |
Palavras-chave: Seismology; Alps; Seismic network; Geodynamics; Seismic imaging; Mountain building. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00690/80173/83243.pdf |
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| Marsset, Bruno; Menut, Eric; Ker, Stephan; Thomas, Yannick; Regnault, Jean-pierre; Leon, Pierre; Martinossi, Henri; Artzner, Laurent; Chenot, Damien; Dentrecolas, Stephane; Spychalski, B.; Mellier, G.; Sultan, Nabil. |
| High Resolution (220–1050 Hz) seismic acquisition performed in deep water using deep-towed systems provides unrivalled lateral resolution when compared to conventional surface seismic. The lateral resolution of these acquisitions is controlled by the width of the first Fresnel zone, taking advantage of their positions close to the sea bottom. No current existing deep towed equipment can benefit from seismic imaging processing techniques to improve this resolution as a consequence of positioning inaccuracies. The technological developments of a digital deep-towed multichannel streamer are presented with a particular attention to positioning: each hydrophone incorporates a pitch, roll and heading sensor in order to monitor the constant deformation of the... |
| Tipo: Text |
Palavras-chave: Deep-towed seismics; Multichannel streamer; Seismic imaging. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00206/31745/35690.pdf |
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| Marsset, Bruno; Ker, Stephan; Thomas, Yannick; Colin, Florent. |
| The acquisition of high resolution seismic data in deep waters requires the development of deep towed seismic sources and receivers able to deal with the high hydrostatic pressure environment. The low frequency piezoelectric transducer of the SYSIF (SYstème Sismique Fond) deep towed seismic device comply with the former requirement taking advantage of the coupling of a mechanical resonance (Janus driver) and a fluid resonance (Helmholtz cavity) to produce a large frequency bandwidth acoustic signal (220–1050 Hz). The ability to perform deep towed multichannel seismic imaging with SYSIF was demonstrated in 2014, yet, the ability to determine P-wave velocity distribution wasn't achieved. P-wave velocity analysis relies on the ratio between the... |
| Tipo: Text |
Palavras-chave: Deep-towed seismic; Seismic imaging; P-wave velocity distribution. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00418/52971/53908.pdf |
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