Seismotectonic regionalization of the Red Sea area and its application to seismic risk analysis

Pedone, Roberto; Lombardo, Paolo; Diamantidis, Dimitris

doi:10.1007/bf00125229

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…We have obtained shallow depth-related deformation that is common in the extensional environment. As confirmed by field observations, most of the faults are obtained within shallow depth range (Bohannon, 1986;Pallister, 1987;Voggenreiter et al, 1988;Bohannon et al, 1989;Pedone et al, 1992) (Figure 15). Seismicity studies, on the other hand, also show that Red Sea is an area of occurring frequent earthquakes shallower than 18 km to 10 km ( Figure 13) (Merghelani and Gallanthine, 1980;Makris and Rhim, 1991;Al-Amri, 1994;Sen and Al-Suba'i, 2001).…”

Section: Neotectonics Active Faulting and Seismicitysupporting

confidence: 79%

“…The second stage of extension (sea-floor spreading) started at around 5 Ma BP and probably confined to the central axis of the Red Sea where thermal weakening has localized the deformation. Present-day seismicity supported by historical events, however, indicates that medium magnitude earthquake swarms are common in the margin and onshore deformation is still continuing (Merghelani and Gallanthine, 1980;Ambraseys and Melville, 1983;Bohannon, 1986;Pedone et al, 1992;Al-Amri, 1994). In this study, following the model of Voggenreiter et al (1988) and using our finite element modeling, the debatable issue of the development of RSCM will be further clarified.…”

Section: Figurementioning

confidence: 94%

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Numerical modeling of the development of southeastern Red Sea continental margin

Dwivedi

Hayashi

2009

Earthq Sci

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The Red Sea continental margin (RSCM) corresponds to a wide hinge zone between Red Sea and Arabian plate. This margin has been studied through geological and geophysical observations primarily in regard to the evolution of Red Sea rift. This margin is characterized by occurrence of thin sediments, significant onshore uplift, tectonic subsidence of the offshore sedimentary basin, active faulting and seismicity. Studies indicate that sedimentary sequences of the margin are deformed by faults and folds resulting from at least two phases of extension and a phase of uplift. During the two phases of extension due to regional plate stress the sequence was cut by set of extensional faults. While during the phase of uplift the sequence was deformed by folding and faulting. The present paper aims to clear the structural development of RSCM during these tectonic episodes, taken as particular tectonic event, by two-dimensional finite element modeling on plane strain condition. Elastic rheology is assumed for the oceanic, continental and transitional crust along with syntectonic deposits. Stress field, shear stress and fault distribution suggests that mantle plume weakened the crust following rifting due to regional stress and developed the margin. These results are well consistent with those from present seismicity, active faulting and neotectonic studies.

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Section: Neotectonics Active Faulting and Seismicitysupporting

confidence: 79%

Section: Figurementioning

confidence: 94%

Numerical modeling of the development of southeastern Red Sea continental margin

Dwivedi

Hayashi

2009

Earthq Sci

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“…The seismicity of the province is related to the active sea floor spreading which mobilizes wide spread sets of strike slip, transcurrent, normal and inverse faults of the main trough and shelves. Most of the epicentres along the axis trough are related to shallow events in the depth range of 10-15 km (Pedone et al, 1992). The future line along which the southern Red Sea is now due to propagate through the Danakil depression (Afar), may either be added to the first zone or considered separately (Ghebreab, 1998).…”

Section: Zone I: the Southern Red Sea Regionmentioning

confidence: 99%

“…Several geophysical studies suggest the presence of a deep and narrow axial trough formed by sea floor spreading during the last 4 Ma (Pedone et al, 1992). Zone 1 includes most of the area of the southern Red Sea, a region between 15°and 20°N, where the seismic activity is concentrated and some parts of the western margin of the East African rift.…”

Section: Zone I: the Southern Red Sea Regionmentioning

confidence: 99%

Application of the Spatially Smoothed Seismicity and Monte Carlo Methods to Estimate the Seismic Hazard of Eritrea and the Surrounding Region

2006

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The region of interest is characterized by incomplete data sets and little information about the tectonic features. Therefore, two methodologies for estimating seismic hazard were used in order to elucidate the robustness of the results: the method of spatially smoothed seismicity introduced by Frankel (1995) and later extended by Lapajne et al. (1997) and a Monte Carlo approach presented by Ebel and Kafka (1999). In the first method, fault-rupture oriented elliptical Gaussian smoothing was performed to estimate future activity rates along the causative structures. Peak ground accelerations were computed for a grid size of 15 km Â 415 km assuming the centre of the grids as epicentres, from which the seismic hazard map was produced. The attenuation relationship by Ambraseys et al. (1996) was found suitable for the region under study. PGA values for 10% probability of exceedence in 50 years (return period of 475 years) were computed for each model and a combined seismic hazard map was produced by subjectively assigning weights to each of these models. A worst-case map is also obtained by picking the highest value at each grid point from values of the four hazard maps. The Monte Carlo method is used to estimate seismic hazard, for comparison to the results from our previous approach. Results obtained from both methods are comparable except values in the first set of maps estimate greater hazard in areas of low seismicity. Both maps indicate a higher hazard along the main tectonic features of the east African and Red Sea rift systems. Within Eritrea, the highest PGA exceeded a value 25% of g, located north of Red Sea port of Massawa. In areas around the capital, Asmara, PGA values exceed 10% of g.

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“…The conventional method for seismic regionalization divides the zones according to the frequency of seismic events and also to a critical review of the structural and tectonic setting of the area [13,14]. We wonder about the possibility of the existence of correlated information and/or redundant, and that some Artificial Intelligence system was able to organize.…”

Section: Related Workmentioning

confidence: 98%

A Chilean seismic regionalization through a Kohonen neural network

Reyes

Cárdenas

2010

Neural Comput & Applic

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Through this paper we are presenting a study of seismic regionalization for continental Chile based on a neural network. A scenario with six seismic regions is obtained, irrespective of the size of the neighborhood or the range of the correlation between the cells of the grid. Unlike conventional seismic methods, our work manages to generate seismic regions tectonically valid from sparse and non-redundant information, which shows that the selforganizing maps are a valuable tool in seismology. The high correlation between the spatial distribution of the seismic zones and geological data confirms that the fields chosen for structuring the training vectors were the most appropriate.

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Seismotectonic regionalization of the Red Sea area and its application to seismic risk analysis

Cited by 20 publications

References 17 publications

Numerical modeling of the development of southeastern Red Sea continental margin

Numerical modeling of the development of southeastern Red Sea continental margin

Application of the Spatially Smoothed Seismicity and Monte Carlo Methods to Estimate the Seismic Hazard of Eritrea and the Surrounding Region

A Chilean seismic regionalization through a Kohonen neural network

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