Propagation of an oblique spreading centre: the western Gulf of Aden

Dauteuil, Olivier; Huchon, Philippe; Quemeneur, F.; Souriot, Thierry

doi:10.1016/s0040-1951(00)00295-x

Cited by 79 publications

(93 citation statements)

References 47 publications

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“…The reason for its occurrence may be linked to the topography of the area (the landlocked end of the Gulf of Tadjourah, a deep inlet of the Indian Ocean into North East Africa formed by the fault between the East African and Arabian continental plates that extends into Africa as the East African Rift Valley). The sea-bed slopes steeply to depths of 1100 m (Dauteuil et al 2001) and strong local winds develop daily all year, caused by rapid heating of the air over the inshore land masses and funnelled by the coastal mountains through the Gulf. This appears to cause an upwelling of plankton in the study area, with biomass of up to 12.7 g m À3 (Marine Conservationn Society Seychelles, unpubl.…”

Section: Further Analysismentioning

confidence: 99%

Long-term membership of whale sharks (Rhincodon typus) in coastal aggregations in Seychelles and Djibouti

Rowat

Brooks

March

et al. 2011

Mar. Freshwater Res.

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Abstract. In coastal waters of several locations globally, whale sharks (Rhincodon typus) form seasonal aggregations, most of which largely comprise juvenile males of 4-8 m length. Evaluation of the period that individuals stay within these size-and age-specific groupings will clarify our understanding of the transition between life-stages in this species and how this might affect their long-term conservation. Long-term photo-identification studies in Seychelles and Djibouti provided data to evaluate this.

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Section: Further Analysismentioning

confidence: 99%

Long-term membership of whale sharks (Rhincodon typus) in coastal aggregations in Seychelles and Djibouti

Rowat

Brooks

March

et al. 2011

Mar. Freshwater Res.

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“…1a). The three extensional plate boundaries are different in age (Barberi et al, 1972;Cochran, 1981;Manighetti et al, 1998;Wolfenden et al, 2004) and divergence rate (Chu and Gordon, 1998;Bilham et al, 1999) but each tends to extend oblique to its strike (Joffe and Garfunkel, 1978;Boccaletti et al, 1994Boccaletti et al, , 1998Dauteuil et al, 2001;Huchon and Khanbari, 2003). Several studies show that the Red Sea and the Gulf of Aden oceanic rifts are propagating on land in Afar (e.g.…”

Section: Introductionmentioning

confidence: 99%

The August 2002 earthquake sequence in north Afar: Insights into the neotectonics of the Danakil microplate

Ayele

Stuart

Bastow

et al. 2007

Journal of African Earth Sciences

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In August 2002, there was high seismic activity in Afar concentrated at the plateau margin of the northern Ethiopian rift east of Mekele, near the western part of the Danakil microplate. The spatial and temporal distributions of this seismic activity over four weeks indicate the NNW propagation of the Gulf of Aden rift across the Afar Depression towards the western Ethiopian plateau. Fault plane solutions for six larger earthquakes from the August 2002 sequence are estimated from moment tensor inversion of local broadband waveform data. The results show only normal faulting on NNW trending and NE dipping faults, which agree with tectonics of the area and distribution of aftershocks. No strike-slip component is observed in any of our fault plane solutions or those of other workers including Harvard CMT solutions in the region. Such motion would be indicative of oblique-slip deformation between the Nubian plate and the Danakil microplate consistent with counter-clockwise rotation of the microplate. Hypocentral depths of well-constrained events are 5-7 km, which is the approximate elastic plate thickness in the Main Ethiopian rift, possibly indicating the depth to the brittle-ductile transition zone in this part of the Afar Depression. The shallowness of the depth estimates agree with the macroseismic reports available from a wide area in northern Ethiopia. Potential future shallow crustal deformation may cause significant loss of human life and damage to property in the densely populated highland region around Mekele unless measures are taken in improving building standards. The b-value for this sequence is estimated to be 0.66 using a least squares fit, while it is 0.67 ± 0.16 from a maximum-likelihood approach. This estimated b-value is low or the frequency of occurrence of relatively larger magnitude events is high indicating that it is a highly stressed region as evidenced by the recent increase of the seismicity in the area.

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“…1). The SSFZ has been proposed as the limit of the influence of the Afar plume and is the location of a major change in the character of the lithosphere (Manighetti et al, 1997;Audin et al, 2001;Dauteuil et al, 2001;Bosworth et al, 2005). The AFFZ/AFTF separates the central (Aden Ridge) and eastern parts (Sheba Ridge) of the Gulf with an offset of~180 km.…”

Section: Geodynamic Setting Of the Gulf Of Adenmentioning

confidence: 99%

“…The westernmost part of the ocean is characterized by an unsegmented straight ridge; whereas the Aden Ridge is highly segmented in the central part (seven transform faults causing northward movement along successive 14-to 47-km-long offsets). Thus, the Gulf of Aden opened obliquely due to relative plate motion (Manighetti et al, 1997;Dauteuil et al, 2001;Huchon and Khanbari, 2003;Bosworth et al, 2005) and consequently, seafloor spreading continued in the Gulf of Aden (e.g., Manighetti et al 1997;d'Acremont et al 2005).…”

Section: Geodynamic Setting Of the Gulf Of Adenmentioning

confidence: 99%

“…Because the Gulf of Aden is an ideal place to investigate the continental break-up and interaction of plume activity with oceanic spreading ridge system, many marine geophysical studies have been conducted in this region (e.g., Manighetti et al, 1997;Dauteuil et al, 2001;Bosworth et al, 2005;d'Acremont et al, 2006Leroy et al, 2004Leroy et al, , 2010. Many of these studies reported a melt anomaly in the Gulf of Aden associated with the Afar mantle plume and its influence on the seafloor spreading process.…”

Section: Introductionmentioning

confidence: 99%

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Sr–Nd–Pb–Hf isotopic constraints on the diversity of magma sources beneath the Aden Ridge (central Gulf of Aden) and plume–ridge interaction

Shinjo

Meshesha²,

Orihashi

et al. 2015

Journal of Mineralogical and Petrological Sciences

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Propagation of an oblique spreading centre: the western Gulf of Aden

Cited by 79 publications

References 47 publications

Long-term membership of whale sharks (Rhincodon typus) in coastal aggregations in Seychelles and Djibouti

Long-term membership of whale sharks (Rhincodon typus) in coastal aggregations in Seychelles and Djibouti

The August 2002 earthquake sequence in north Afar: Insights into the neotectonics of the Danakil microplate

Sr–Nd–Pb–Hf isotopic constraints on the diversity of magma sources beneath the Aden Ridge (central Gulf of Aden) and plume–ridge interaction

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