Seismicity and seismotectonics of Libya: as an example of intraplate environment

Al-Heety, Emad A.

doi:10.1007/s12517-011-0347-y

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Isotope data and geochemical signatures for basaltic rocks within the Al Haruj Volcanic Province indicate that fractional crystallization of primitive magma took place at depths of 25–39 km and temperatures of 1215–1360°C (Nixon et al, ). The majority of earthquakes in Libya occur at depths around 30–35 km (Al‐Heety, ) that suggests that the increased seismogenic thickness in Libya corresponds to a thick lithosphere underlying the region (cf. Craig et al, ; Priestley & McKenzie, ).…”

Section: Discussionmentioning

confidence: 99%

“…If magma resides beneath central Libya in reservoirs, then the volcanic systems may pose a significant earthquake and volcanic risks. Many earthquakes that occurred in Libya during the past century have depths between 30 km and 35 km (Al‐Heety, ). Fractional crystallization of the primitive magmas at the Al Haruj Volcanic Province is also thought to have occurred at similar depths, namely, in reservoirs at depths of 25–39 km (Nixon et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…This research pioneers the efforts in studying the crustal thickness beneath Libya. A major problem for the seismicity studies of Libya in past decades was the absence of any extensive seismological network until 2005 at which time the first Libyan seismological network was established (Al‐Heety, ). Specifically, this study uses seismologic data acquired from 2005 to 2009 and allows us to infer in much greater detail than has been possible before the depth of Moho in various parts in Libya and, in particular, the origin of the partial melting within the AS Sawda Volcanic Province, central Libya.…”

Section: Introductionmentioning

confidence: 99%

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Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

et al. 2017

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This study investigates crustal thickness and properties within the Libyan region. Results obtained from 15 seismic stations belonging to the Libyan Center for Remote Sensing and Space Science are reported, in addition to 3 seismic stations publically available, using receiver functions. The results show crustal thicknesses ranging from 24 km to 36 km (with uncertainties ranging between ±0.10 km and ±0.90 km). More specifically, crustal thickness ranges from 32 km to 36 km in the southern portion of the Libyan territory then becomes thinner, between 24 km and 30 km, in the coastal areas of Libya and thinnest, between 24 km and 28 km, in the Sirt Basin. The observed high Vp/Vs value of 1.91 at one station located at the AS Sawda Volcanic Province in central Libya indicates the presence of either partial melt or an abnormally warm area. This finding suggests that magma reservoirs beneath the Libyan territory may still be partially molten and active, thereby posing significant earthquake and volcanic risks. The hypothesis of an active magma source is further demonstrated though the presence of asthenospheric upwelling and extension of the Sirt Basin. This study provides a new calculation of unconsolidated sediment layers by using the arrival time of the P to S converted phases. The results show sediments thicknesses of 0.4 km to 3.7 km, with the Vp/Vs values ranging from 2.2 to 4.8. The variations in crustal thickness throughout the region are correlated with surface elevation and Bouguer gravity anomalies, which suggest that they are isostatically compensated.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

et al. 2017

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“…For the geomorphology and Quaternary geology of Cyrenaica, in places reflecting the skeleton of its structure established during its paleotectonic evolution, see Mühlhofer (1923), McBurney and Hey (1955), Hey (1968a, b) and Völger (1968). For the seismotectonics in Cyrenaica, see Campbell (1968), Goodchild (1968) and Al-Heety (2013).…”

Section: The Ayyubid Orogen: Spatial Extentmentioning

confidence: 99%

The Ayyubid Orogen: An Ophiolite Obduction-Driven Orogen in the Late Cretaceous of the Neo-Tethyan South Margin

Şengör

Stock

2014

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A minimum 5000-km long obduction-driven orogeny of medial to late Cretaceous age is located between Cyrenaica in eastern Libya and Oman. It is herein called the Ayyubid Orogen after the Ayyubid Empire that covered much of its territory. The Ayyubid orogen is distinct from other Alpide orogens and has two main parts: a western, mainly germanotype belt and an eastern mainly alpinotype belt. The germanotype belt formed largely as a result of an aborted obduction, whereas the alpinotype part formed as a result of successful and large-scale obduction events that choked a nascent subduction zone. The mainly germanotype part coincides with Erich Krenkel's Syrian Arc (Syrischer Bogen) and the alpinotype part with Ricou's Peri-Arabian Ophiolitic Crescent (Croissant Ophiolitique péri-Arabe). These belts formed as a consequence of the interaction of one of the now-vanished Tethyan plates and Afro-Arabia. The Africa-Eurasia relative motion has influenced the orogen's evolution, but was not the main causative agent. Similar large and complex obduction-driven orogens similar to the Ayyubids may exist along the Ordovician Newfoundland/Scotland margin of the Caledonides and along the Ordovician European margin of the Uralides.SOMMAIREEntre la Cyrénaïque dans l'est de la Libye et Oman, se trouve un ceinture orogénique d’au moins 5 000 km de longueur créé par obduction au Crétacé moyen et tardif. Nous le nommons ici l’orogène ayyoubide d’après l'empire ayyoubide qui couvrait une grande partie de son territoire. L'orogène ayyoubide qui est distincte des autres orogènes alpides, comporte deux parties principales : une bande occidentale, principalement germanotype, et une bande orientale principalement alpinotype. La bande germanotype s’est formée en grande partie à la suite d'une obduction avortée, tandis que la partie alpinotype s’est formée par des épisodes d’obduction à grande échelle qui ont étranglé une zone de subduction naissante. La partie principalement germanotype coïncide avec l’arc syrien d’Erich Krenkel (Syrischer Bogen), alors que la partie alpinotype correspond au croissant ophiolitique péri-Arabe de Ricou (Croissant ophiolitique péri-Arabe). Ces bandes se sont formées par l'interaction de l'une des plaques de la Téthys, maintenant disparues, avec l’Afro-Arabie. Le mouvement relatif Afrique-Eurasie a influencé l'évolution de l'orogène, mais ça n’a pas été le principal facteur. Des orogènes grandes et complexes résultant de mécanismes d’obduction similaires à l’orogène Ayyoubide peuvent exister le long de la marge des Calédonides de l'Ordovicien de Terre-Neuve/Écosse et le long de la marge européenne des Uralides de l'Ordovicien.

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“…Comprehensive seismic hazard assessments of Libya, as conducted by Kebeasy [8], Suleiman and Doser [9], Al-Heety [10], Al-Heety and Eshwehdi [11], provide detailed insights into seismicity, seismotectonics, and ground motion. These studies benefited from locally obtained ground motion data from the Libyan Digital Seismological Network (LDSN).…”

Section: Unveiling the Seismic Potential Of The Study Areamentioning

confidence: 99%

Developing design response spectra for Benghazi city including soil magnification effects

Layas,

Karakale,

Suleiman

2024

Build. Eng.

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Earthquakes in some countries worldwide cause loss of lives and properties. In Libya, design of structures to resist earthquake forces was based on a paper work published by Mallick in 1976. In 1977, and after small changes in the earthquake zoning map of Libya, the ministry of housing, at that time, adopted it as a draft code of practice for the design of structures to resist earthquake forces. With Benghazi city undergoing significant rehabilitation and development programs, including major national projects, there is a pressing need to estimate updated probabilistic seismic hazard maps and design response spectra specific to the city. This study presented updated probabilistic seismic hazard ground motion for Benghazi city, considering different return periods and accounting for peak ground acceleration (PGA) values with various soil conditions. Proposed design response spectra for Benghazi City unveils substantial PGA amplifications in soft soil areas.

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Seismicity and seismotectonics of Libya: as an example of intraplate environment

Cited by 8 publications

References 21 publications

Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

The Ayyubid Orogen: An Ophiolite Obduction-Driven Orogen in the Late Cretaceous of the Neo-Tethyan South Margin

Developing design response spectra for Benghazi city including soil magnification effects

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