Consulta: creatorFacets:"Kopp, Heidrun"
Registros recuperados: 12
Data/hora: 13/06/2024 01:08:40

Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey.
Provedor de dados: 5
Autores: Dellong, David; Klingelhoefer, Frauke; Kopp, Heidrun; Graindorge, David; Margheriti, Lucia; Moretti, Milena; Murphy, Shane; Gutscher, Marc-andre.
In the Ionian Sea (Central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreat toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian Basin. A major lateral slab tear fault is required to accommodate the slab roll-back. This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial....
Tipo: Text
Palavras-chave: Ionian basin; Crustal structure; Wide-angle seismic; Geodynamic; Mediterranean; Malta Escarpment.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00427/53885/54956.pdf

Fiber optic monitoring of active faults at the seafloor: I the FOCUS project
Provedor de dados: 5
Autores: Gutscher, Marc-andre; Royer, Jean-yves; Graindorge, David; Murphy, Shane; Klingelhoefer, Frauke; Aiken, Chastity; Cattaneo, Antonio; Barreca, Giovanni; Quetel, Lionel; Riccobene, Giorgio; Petersen, Florian; Urlaub, Morelia; Krastel, Sebastian; Gross, Felix; Kopp, Heidrun; Margheriti, Lucia; Beranzoli, Laura.
Laser reflectometry (BOTDR), commonly used for structural health monitoring (bridges, dams, etc.), will for the first time be applied to study movements of an active fault on the seafloor 25 km offshore Catania Sicily. The goal of the European funded FOCUS project (ERC Advanced Grant) is to connect a 6-km long strain cable to the EMSO seafloor observatory in 2100 m water depth. Laser observations will be calibrated by seafloor geodetic instruments and seismological stations. A long-term goal is the development of dual-use telecom cables with industry partners.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00493/60430/63872.pdf

Dehydration of subducting slow-spread oceanic lithosphere in the Lesser Antilles
Provedor de dados: 5
Autores: Paulatto, Michele; Laigle, Mireille; Galve, Audrey; Charvis, Philippe; Sapin, Martine; Bayrakci, Gaye; Evain, Mikael; Kopp, Heidrun.
Subducting slabs carry water into the mantle and are a major gateway in the global geochemical water cycle. Fluid transport and release can be constrained with seismological data. Here we use joint active-source/local-earthquake seismic tomography to derive unprecedented constraints on multi-stage fluid release from subducting slow-spread oceanic lithosphere. We image the low P-wave velocity crustal layer on the slab top and show that it disappears beneath 60–100 km depth, marking the depth of dehydration metamorphism and eclogitization. Clustering of seismicity at 120–160 km depth suggests that the slab’s mantle dehydrates beneath the volcanic arc, and may be the main source of fluids triggering arc magma generation. Lateral variations in seismic...
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00392/50321/51004.pdf

The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen
Provedor de dados: 5
Autores: 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

Interseismic strain build-up on the submarine North Anatolian Fault offshore Istanbul
Provedor de dados: 5
Autores: Lange, Dietrich; Kopp, Heidrun; Royer, Jean-yves; Henry, Pierre; Cakir, Ziyadin; Petersen, Florian; Sakic, Pierre; Ballu, Valerie; Bialas, Joerg; Ozeren, Mehmet Sinan; Ergintav, Semih; Geli, Louis.
Using offshore geodetic observations, we show that a segment of the North Anatolian Fault in the central Sea of Marmara is locked and therefore accumulating strain. The strain accumulation along this fault segment was previously extrapolated from onshore observations or inferred from the absence of seismicity, but both methods could not distinguish between fully locked or fully creeping fault behavior. A network of acoustic transponders measured crustal deformation with mm-precision on the seafloor for 2.5 years and did not detect any significant fault displacement. Absence of deformation together with sparse seismicity monitored by ocean bottom seismometers indicates complete fault locking to at least 3 km depth and presumably into the crystalline...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00507/61838/65897.pdf

Ionian Abyssal Plain: A window into the Tethys oceanic lithosphere
Provedor de dados: 5
Autores: Dannowski, Anke; Kopp, Heidrun; Klingelhoefer, Frauke; Klaeschen, Dirk; Gutscher, Marc-andre; Krabbenhoeft, Anne; Dellong, David; Rovere, Mickael; Graindorge, David; Papenberg, Cord; Klaucke, Ingo.
The nature of the Ionian Sea crust has been the subject of scientific debate for more than 30 years, mainly because seismic imaging of the deep crust and upper mantle of the Ionian Abyssal Plain (IAP) has not been conclusive to date. The IAP is sandwiched between the Calabrian and Hellenic subduction zones in the central Mediterranean. To univocally confirm the proposed oceanic nature of the IAP crust as a remnant of the Tethys ocean and to confute its interpretation as a strongly thinned part of the African continental crust, a NE-SW oriented 131 km long seismic refraction and wide-angle reflection profile consisting of eight ocean bottom seismometers and hydrophones was acquired in 2014. A P-wave velocity model developed from travel time forward...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00473/58431/61006.pdf

3-D active source tomography around Simeulue Island offshore Sumatra: Thick crustal zone responsible for earthquake segment boundary
Provedor de dados: 5
Autores: Tang, Genyang; Barton, Penny J.; Mcneill, Lisa C.; Henstock, Timothy J.; Tilmann, Frederik; Dean, Simon M.; Jusuf, Muhammad D.; Djajadihardja, Yusuf S.; Permana, Haryadi; Klingelhoefer, Frauke; Kopp, Heidrun.
We present a detailed 3-D P-wave velocity model obtained by first-arrival travel-time tomography with seismic refraction data in the segment boundary of the Sumatra subduction zone across Simeulue Island, and an image of the top of the subducted oceanic crust extracted from depth-migrated multi-channel seismic reflection profiles. We have picked P-wave first arrivals of the air-gun source seismic data recorded by local networks of ocean-bottom seismometers, and inverted the travel-times for a 3-D velocity model of the subduction zone. This velocity model shows an anomalous zone of intermediate velocities between those of oceanic crust and mantle that is associated with raised topography on the top of the oceanic crust. We interpret this feature as a...
Tipo: Text
Palavras-chave: Active-source tomography; Sumatra subduction zone; Segmentation; Plate interface.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00137/24834/22916.pdf

Basin inversion: Reactivated rift structures in the Ligurian Sea revealed by OBS
Provedor de dados: 5
Autores: 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,...
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00678/79017/81416.pdf

Reply to Comment by A. Argnani on "Geometry of the Deep Calabrian Subduction from Wide‐Angle Seismic Data and 3‐D Gravity Modeling"
Provedor de dados: 5
Autores: Dellong, David; Klingelhoefer, Frauke; Dannowski, Anke; Kopp, Heidrun; Murphy, Shane; Graindorge, David; Margheriti, Lucia; Moretti, Milena; Barreca, Giovanni; Scarfì, Luciano; Polonia, Alina; Gutscher, Marc-andre.
Andrea Argnani in his comment on Dellong et al., 2020 (Geometry of the deep Calabrian subduction (Central Mediterranean Sea) from wide‐angle seismic data and 3D gravity modeling), proposes an alternate interpretation of the wide‐angle seismic velocity models presented by Dellong et al., 2018 and Dellong et al., 2020 and proposes a correction of the literature citations in these paper. In this reply, we discuss in detail all points raised by Andrea Argnani.
Tipo: Text
Palavras-chave: Wide-angle seismic; Ionian basin; Gravity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00640/75196/75326.pdf

Geometry of the deep Calabrian subduction (Central Mediterranean Sea) from wide‐angle seismic data and 3‐D gravity modeling
Provedor de dados: 5
Autores: Dellong, David; Klingelhoefer, Frauke; Dannowski, Anke; Kopp, Heidrun; Murphy, Shane; Graindorge, David; Margheriti, Lucia; Moretti, Milena; Barreca, Giovanni; Scarfì, Luciano; Polonia, Alina; Gutscher, Marc-andre.
The Calabrian subduction zone is one of the narrowest arcs on Earth and a key area to understand the geodynamic evolution of the Mediterranean and other marginal seas. Here in the Ionian Sea, the African plate subducts beneath Eurasia. Imaging the boundary between the downgoing slab and the upper plate along the Calabrian subduction zone is important for assessing the potential of the subduction zone to generate mega‐thrust earthquakes and was the main objective of this study. Here we present and analyze the results from a 380 km long, wide‐angle seismic profile spanning the complete subduction zone, from the deep Ionian Basin and the accretionary wedge to NE Sicily, with additional constraints offered by 3‐D Gravity modeling and the analysis of earthquake...
Tipo: Text
Palavras-chave: Ionian Basin; Wide-angle seismic; Gravity; Crustal structure; Seismicity; Tomography.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00592/70442/68544.pdf

Active tectonics of the Calabrian subduction revealed by new multi-beam bathymetric data and high-resolution seismic profiles in the Ionian Sea (Central Mediterranean)
Provedor de dados: 5
Autores: Gutscher, Marc-andre; Kopp, Heidrun; Krastel, Sebastian; Bohrmann, Gerhard; Garlan, Thierry; Zaragosi, Sebastien; Klaucke, Ingo; Wintersteller, Paul; Loubrieu, Benoit; Le Faou, Yann; San Pedro, Laurine; Dominguez, Stephane; Rovere, Marzia; De Lepinay, Bernard Mercier; Ranero, Cesar; Sallares, Valenti.
The detailed morphology and internal structure of the Calabrian accretionary wedge and adjacent Eastern Sicily margin are imaged in unprecedented detail by a combined dataset of multi-beam bathymetry and high-resolution seismic profiles. The bathymetric data represent the results of 6 recent marine geophysical surveys since 2010 as well as a compilation of earlier surveys presented as a 2 arc-sec (60 m) grid. Several distinct morpho-tectonic provinces are identified including: the deeply incised Malta–Hyblean Escarpment, numerous submarine canyons, broad regions of relatively flat seafloor dominated by fields of sediment waves, the gently undulating anticlinal fold-and-thrust belts of the external Calabrian accretionary wedge and the adjacent portion of...
Tipo: Text
Palavras-chave: Subduction; Active faults; Eurasia-Africa plate boundary; Bathymetry; Seismic profiles; Accretionary wedge.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00366/47685/47853.pdf

Arrival angles of teleseismic fundamental mode Rayleigh waves across the AlpArray
Provedor de dados: 5
Autores: Kolinsky, Petr; Bokelmann, Goetz; Hetenyi, Gyorgy; Abreu, Rafael; Allegretti, Ivo; Apoloner, Maria-theresia; Aubert, Coralie; Besancon, Simon; Bes De Berc, Maxime; Bokel-mann, Gotz; Brunel, Didier; Capello, Marco; Carman, Martina; Cavaliere, Adriano; Cheze, Jerome; Chiarabba, Claudio; Clinton, John; Cougoulat, Glenn; Crawford, Wayne C.; Cristiano, Luigia; Czifra, Tibor; D'Alema, Ezio; Danesi, Stefania; Daniel, Romuald; Dannowski, Anke; Dasovic, Iva; Deschamps, Anne; Dessa, Jean-xavier; Doubre, Cecile; Egdorf, Sven; Fiket, Tomislav; Fischer, Kasper; Friederich, Wolfgang; Fuchs, Florian; Funke, Sigward; Giardini, Domenico; Govoni, Aladino; Graczer, Zoltan; Groschl, Gidera; Heimers, Stefan; Heit, Ben; Herak, Davorka; Herak, Marijan; Huber, Johann; Jaric, Dejan; Jedlicka, Petr; Jia, Yan; Jund, Helene; Kissling, Edi; Klingen, Stefan; Klotz, Bernhard; Kolinsky, Petr; Kopp, Heidrun; Korn, Michael; Kotek, Josef; Kuhne, Lothar; Kuk, Kreso; Lange, Dietrich; Loos, Jurgen; Lovati, Sara; Malengros, Deny; Margheriti, Lucia; Maron, Christophe; Martin, Xavier; Massa, Marco; Mazzarini, Francesco; Meier, Thomas; Metral, Laurent; Molinari, Irene; Moretti, Milena; Nardi, Anna; Pahor, Jurij; Paul, Anne; Pequegnat, Catherine; Petersen, Daniel; Pesaresi, Damiano; Piccinini, Davide; Piromallo, Claudia; Plenefisch, Thomas; Plomerova, Jaroslava; Pondrelli, Silvia; Prevolnik, Snjezan; Racine, Roman; Regnier, Marc; Reiss, Miriam; Ritter, Joachim; Rumpker, Georg; Salimbeni, Simone; Santulin, Marco; Scherer, Werner; Schippkus, Sven; Schulte-kortnack, Detlef; Sipka, Vesna; Solarino, Stefano; Spallarossa, Daniele; Spieker, Kathrin; Stipcevic, Josip; Strollo, Angelo; Sule, Balint; Szanyi, Gyongyver; Szucs, Eszter; Thomas, Christine; Thorwart, Martin; Tilmann, Frederik; Ueding, Stefan; Vallocchia, Massimiliano; Vecsey, Ludek; Voigt, Rene; Wassermann, Joachim; Weber, Zoltan; Weidle, Christian; Wesztergom, Viktor; Weyland, Gauthier; Wiemer, Stefan; Wolf, Felix; Wolyniec, David; Zieke, Thomas; Zivcic, Mladen; Zlebcikova, Helena.
The dense AlpArray network allows studying seismic wave propagation with high spatial resolution. Here we introduce an array approach to measure arrival angles of teleseismic Rayleigh waves. The approach combines the advantages of phase correlation as in the two-station method with array beamforming to obtain the phase-velocity vector. 20 earthquakes from the first two years of the AlpArray project are selected, and spatial patterns of arrival-angle deviations across the AlpArray are shown in maps, depending on period and earthquake location. The cause of these intriguing spatial patterns is discussed. A simple wave-propagation modelling example using an isolated anomaly and a Gaussian beam solution suggests that much of the complexity can be explained as...
Tipo: Text
Palavras-chave: Structure of the Earth; Europe; Time-series analysis; Surface waves and free oscillations; Wave propagation; Wave scattering and diffraction.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00690/80172/83241.pdf