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Spatial and temporal dynamics of gas-related processes in the Sea of Marmara monitored with ocean bottom seismometers ArchiMer
Tsang-hin-sun, Eve; Batsi, Evangelia; Klingelhoefer, Frauke; Géli, Louis.
In the Sea of Marmara, areas of gas seepage or cold seeps are tightly related to the faults system and understanding the spatial and temporal dynamics in gas-related processes is crucial for geohazard mitigation. Although acoustic surveys proved to be efficient in detecting and locating cold seeps, temporal variability or trends in the gas-related processes are still poorly understood. Two arrays of 10 ocean bottom seismometers were deployed in the western part of the Sea of Marmara in 2011 and 2014, respectively. In addition to the local seismic events, the instruments recorded a large number of short duration events and long-lasting tremors. Short duration events are impulsive signals with duration < 1 s, amplitude well above the noise level and a...
Tipo: Text Palavras-chave: Gas and hydrate systems; Spatial analysis; Time-series analysis; Earthquake source observations; Seismicity and tectonics.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00473/58426/61003.pdf
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Seafloor spreading event in western Gulf of Aden during the November 2010-March 2011 period captured by regional seismic networks: evidence for diking events and interactions with a nascent transform zone ArchiMer
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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