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| Ahmed, Abdulhakim; Doubre, Cecile; Leroy, Sylvie; Kassim, Mohamed; Keir, Derek; Abayazid, Ahmadine; Julie, Perrot; Laurence, Audin; Vergne, Jerome; Alexandre, Nercessian; Jacques, Eric; Khanbari, Khaled; Sholan, Jamal; Rolandone, Frederique; Al-ganad, Ismael. |
| In November 2010, intense seismic activity including 29 events with a magnitude above 5.0, started in the western part of the Gulf of Aden, where the structure of the oceanic spreading ridge is characterized by a series of N115 degrees-trending slow-spreading segments set within an EW-trending rift. Using signals recorded by permanent and temporary networks in Djibouti and Yemen, we located 1122 earthquakes, with a magnitude ranging from 2.1 to 5.6 from 2010 November 1 to 2011 March 31. By looking in detail at the space-time distribution of the overall seismicity, and both the frequency and the moment tensor of large earthquakes, we re-examine the chronology of this episode. In addition, we also interpret the origin of the activity using high-resolution... |
| Tipo: Text |
Palavras-chave: Earthquake source observations; Seismicity and tectonics; Mid-ocean ridge processes; Transform faults; Submarine tectonics and volcanism; Dynamics: seismotectonics. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00639/75087/75528.pdf |
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| Lemoine, Anne; Briole, Pierre; Bertil, Didier; Roullé, Agathe; Foumelis, Michael; Thinon, Isabelle; Raucoules, Daniel; De Michele, Marcello; Valty, Pierre; Hoste Colomer, Roser. |
| On May 10th, 2018, an unprecedented long and intense seismic crisis started offshore, east of Mayotte, the easternmost of the Comoros volcanic islands. The population felt hundreds of events. Over the course of one year, 32 earthquakes with magnitude greater than 5 occurred, including the largest event ever recorded in the Comoros (Mw = 5.9 on May 15th, 2018). Earthquakes are clustered in space and time. Unusual intense long lasting monochromatic very long period events were also registered. From early July 2018, Global Navigation Satellite System stations and Interferometric Synthetic Aperture Radar registered a large drift, testimony of a large offshore deflation. We describe the onset and the evolution of a large magmatic event thanks to the analysis of... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Seismicity and tectonics; Submarine tectonics and volcanism; Effusive volcanism; Remote sensing of volcanoes; Volcano seismology. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00632/74401/74104.pdf |
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| Rodriguez, Mathieu; Maleuvre, Clement; Jollivet-castelot, Martin; D'Acremont, Elia; Rabaute, Alain; Lafosse, Manfred; Ercilla, Gemma; Vazquez, Juan-tomas; Alonso, Belen; Ammar, Abdellah; Gorini, Christian. |
| The active Eurasia-Nubia plate boundary runs across the Alboran Sea in theWestern Mediterranean Sea, where the connection between the Atlantic and Mediterranean water masses occurs. Earthquakes above magnitude M-w > 6 may favour the occurrence of landslides within contouritic drifts in the Alboran Sea. A compilation of recent multibeam data reveals for the first time the distribution of slope failures along the Xauen-Tofino banks, in the southern Alboran Sea. Here, we provide a detailed mapping and description of the morphology of eight Holocene landslides, including volume estimations of the failed mass and the related mass transport deposits (MTDs). The most voluminous landslide mobilized similar to 0.5 km(3) of sediment at the initial stage of slope... |
| Tipo: Text |
Palavras-chave: Tsunamis; Submarine landslides; Submarine tectonics and volcanism; Africa. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00474/58560/61118.pdf |
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