Seismicity of the Western Side of the Southern Red Sea

Ogubazghi, Ghebrebrhan; Goitom, Berhe

doi:10.1007/978-3-662-45201-1_9

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…Along the rift axis in the northern Red Sea region, a series of earthquakes were reported around Alid volcano in 1901and 1902(Gouin, 1979 and also around Bada in 1993 (Ogubazghi et al, 2004;Ogubazghi and Goitom, 2015). Although these were unrelated to eruptive activity, they were interpreted as being due to magmatic processes in the crust.…”

Section: Historical Seismicitymentioning

confidence: 99%

Probabilistic Seismic‐Hazard Assessment for Eritrea

Goitom¹,

Werner²,

Goda³

et al. 2017

Bulletin of the Seismological Society of America

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To date little is known about seismic hazard in Eritrea, despite its location in a volcanically and tectonically active region, and the gathering pace of major infrastructure projects. In response, we report the findings of a comprehensive probabilistic seismic-hazard assessment for Eritrea and adjacent areas. Seismic source and groundmotion models are constructed separately; we use an adaptive spatiotemporal smoothing method to map expected patterns of seismicity. To construct a consistent earthquake catalog from different data sets, we use orthogonal regression to convert and unify different magnitude scales. A sensitivity analysis of the different input parameters helps constrain them and disaggregation of site-specific hazard estimates yields insights into the relative contribution from seismic sources of different magnitudes and distances. The results highlight seismic hazard in proximity to the Red Sea, Gulf of Aden, Afar depression, and along the boundaries of the Danakil microplate. We estimate a 10% chance over 50 years of observing pseudospectral accelerations (PSAs) at 0.2 s exceeding 0:16g in the port city of Massawa (population ∼32;000) and the town of Bada (population ∼4000). For the capital, Asmara (population ∼520;000), we calculate a PSA of 0:11g at 0.2 s. Compared with previous studies, our results provide greater spatial resolution, use more recent ground-motion models, and benefit from a smoothed seismicity method. Our aims are to stimulate further studies and contribute to the safe development of the region in light of its exposure to seismic hazards.

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Section: Historical Seismicitymentioning

confidence: 99%

Probabilistic Seismic‐Hazard Assessment for Eritrea

Goitom¹,

Werner²,

Goda³

et al. 2017

Bulletin of the Seismological Society of America

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Earthquake recurrence characteristics for potential seismic zones in the southern Red Sea region and their hazard implications on Jizan city

Abdelfattah

Abdelrahman

Qaysi

et al. 2022

Journal of King Saud University - Science

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Neodymium isotope mapping a polygenetic TTG batholith: failed back-arc rifting in the Central Metasedimentary Belt, southwestern Grenville Province

Strong

Dickin

2022

Can. J. Earth Sci.

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Fifty-five new Nd isotope analyses are presented for plutonic orthogneisses from the Grimsthorpe domain in the marble-rich segment of the Grenvillian Central Metasedimentary Belt (CMB) to test the back-arc aulacogen model for its origin. Nd isotope analyses from the Weslemkoon batholith, Elzevir batholith, Lingham Lake complex and Canniff tonalite are used to probe the crustal formation age of their source rocks. Despite its concentric foliation, the Weslemkoon batholith displays a complex geochemical pattern consisting of several NE trending domains with older TDM ages, surrounded by juvenile crustal material. The new Nd isotope results, coupled with geochemistry for the Weslemkoon and Elzevir batholiths depict the fragmentation of a block of old crust that formed a screen between en echelon segments of a mid-Mesoproterozoic back-arc rift zone. The isotope boundaries identified within the Weslemkoon batholith delineate magma pulses sampling two distinct sources, interpreted as Laurentian basement and juvenile basaltic underplate. Underplating could be attributed to slab rollback under the pre-Grenvillian continental margin arc. The intensification of rift-related magmatism in the CMB is demonstrated by its bimodal petrological character. A modern analogue for the tectonic context of the CMB is the Gulf of California, where subduction-related magmatism has transitioned to rift-related magmatism. However, the Gulf of California exhibits more transcurrent motion than is evidenced by the geometry of the CMB rift. A geometrical analogue for the break-up of the Elzevir block between two rift segments is provided by the Danakil block of the Red Sea, which is currently undergoing similar tectonic fragmentation.

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Seismicity of the Western Side of the Southern Red Sea

Cited by 3 publications

References 49 publications

Probabilistic Seismic‐Hazard Assessment for Eritrea

Probabilistic Seismic‐Hazard Assessment for Eritrea

Earthquake recurrence characteristics for potential seismic zones in the southern Red Sea region and their hazard implications on Jizan city

Neodymium isotope mapping a polygenetic TTG batholith: failed back-arc rifting in the Central Metasedimentary Belt, southwestern Grenville Province

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