زلزالية شبه جزيرة سيناء - مصر

Abdelrahman, Kamal; Alamri, Abdullah; Abdelmoneim, E.

doi:10.1007/s12517-008-0014-0

Cited by 21 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high seismic activity of the AQ zone is attributed to the Gulf of Aqaba's left-lateral strikeslip movement (Ben-Avraham 1985;Toni 2012;Toni et al, 2016Toni et al, , 2019aBadreldin et al 2019;Hagag et al 2019). Abdel-Rahman et al (2009) reported that recent earthquakes all over the Sinai Peninsula are larger than historical ones, which agrees with the region's neotectonic reactivation models. The vertical distribution of the earthquake focal depths (Fig.…”

Section: Resultsmentioning

confidence: 56%

“…4) depicts the tectonic action in the Sinai Peninsula, with a high concentration in its southern portion parallel to the Gulf of Suez and the Gulf of Aqaba motions. According to the description of seismic source zones of Abdel-Rahman et al (2009), the most active zones are the Aqaba (AQ) and the southern Gulf of Suez (SGZ). The crustal motions between the Arabian plate, African plate, and Sinai subplate result in a high seismicity rate in the SGZ zone.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

View full text Add to dashboard Cite

The Sinai Peninsula is a subplate located between the African and Arabian plates. It is an important subplate in the world; however, this region is poorly understood because of the shortage of geophysical data. Thus, this study focuses on built a three-dimensional (3D) high-resolution forward model of the crustal thickness with a new tectonic model and structural evaluation of the Sinai Peninsula to understand this area tectonically and determine its lithospheric and crustal thicknesses. Qualitative and quantitative interpretations of Bouguer gravity, reduced-to-the-pole (RTP) aeromagnetic, and earthquake data are explained to achieve the goals of this study. Two-dimensional (2D) interactive sequential modeling of gravity data is performed along with some well-selected profiles with existing crustal layer depth points from previous works in the studied region. Seventeen 2D models are constructed and used to determine the basement, Conrad (lower crust boundary), and Moho (upper mantle boundary) depths and to build a 3D model. Accuracy of the 3D built model is evaluated by extracting observed, calculated, and residual gravity anomaly maps. The results show that the basement rocks appear on the surface in the South of Sinai and deepen (down to 4.5 km) toward the North. The Conrad surface varies approximately from 16 km (in the northeast and southwest of Sinai) to 22.8 km (in the southeast). The Moho surface depth (i.e., crustal thickness) varies approximately from 28.8 to 34.2 km, and it deepens toward the northeastern and southwestern parts of Sinai. A tentative basement structure map is constructed from the horizontal gradient (H-gradient) filter and the 3D Euler deconvolution of the Bouguer gravity and RTP aeromagnetic data. Correlation between the geological background of the study area and the obtained results suggests that the Sinai Peninsula is tectonically active, mainly in its southern portion due to the tectonic movements along the Gulf of Suez and the Gulf of Aqaba. The crustal thickness increases southward and thins northward.

show abstract

Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

2022

View full text Add to dashboard Cite

show abstract

“…These include Fairhead (1968); Sykes (1970); Fairhead andGirdler (1970, 1972); Poirier and Taher (1980); Ambraseys and Melville (1983);El-Isa et al (1984); Alsinawi (1986); El-Isa and Al- Shanti (1989); Pedone et al (1992); Al-Amri (1994, 1995a; Ambraseys et al (1994); Al-Amri et al (1998); Alsinawi and Alaydarus (1999); Badawy (2005); Korrat et al (2006); Marzouk (2008); Abdel-Rahman et al (2009);El-Isa (2013a).…”

Section: Historical Seismicity Datamentioning

confidence: 99%

Seismicity and seismotectonics of the Red Sea Region

El-Isa

2015

Arab J Geosci

View full text Add to dashboard Cite

The historical seismicity of the Red Sea region between latitudes 13 and 30°N and longitudes 32 and 46°E has been revised. It is found that during the last 1400 years, some 88 historical earthquakes have occurred with magnitudes M≥ 5.6. Only two M=7.0 are reported, one in each of the northern and southern Red Sea regions, followed by two and one 6.8 in the northern and southern regions, respectively. During the period 1960-2010, some 1310 instrumental earthquakes have occurred in the region with M≥4.0. The largest (M=7.1) occurred in the Gulf of Aqaba, followed by a 6.9 in the entrance of the Gulf of Suez, followed by a 6.7 and a 6.4 that occurred in the southern Red Sea region. All others had M≤6.2. More than 90 % of the seismicity has occurred in the form of sequences and swarms and are believed to be volcanic related. Thus, the seismic hazard of the study region remains quite limited. Both northern and southern parts of the Red Sea region are of comparable seismic activities, while that of the central part is of lower activity. The historical and instrumental seismicity data show excellent correlation with the general tectonics of the study region. These also show that earthquake activity has fluctuated with time from one region to the other. In the Red Sea proper, more than 83 % of the seismic moment is associated with the regional faults of the axial trough with noticeable concentration of activity where the NE trending strike-slip faults cross this trough. Published fault plane solutions for the largest instrumental earthquakes of the last few decades show that both normal and strike-slip faults are active in support of a divergent environment between the Arabian and African plates. Shallow seismicity is a characteristic feature of this region. The data indicates that lithospheric deformations beneath the gulfs area are restricted to the upper part of the crust, while beneath the Red Sea south of latitude 27.8°, these appear to concentrate partially within the crust down to 10 km depth and much more within the uppermost mantle, mostly from 20.1 to 40 km depths. Very little earthquakes occur at depths deeper than 60 km. Frequency-magnitude results of both historic and instrumental data gave the expected b value close to 1.0. The calculated recurrence periods for earthquakes with M=6, 6.5 and 7 are 30±2 years, 150± 10 years and 600±20 years, respectively. The data show that the threshold magnitude for the study region is 4.0, and slightly more for the axial trough.

show abstract

“…Historical and instrumental seismicity of the Sinai Peninsula have been investigated by many researchers [22][23][24][25][26][27]. Twenty-five seismic events have been reported between 95 BC and 1910 AD at various localities with different intensities [28]. The reported intensities were based on recorded damage, which indicates heterogeneous behavior in space or time (Figure 3).…”

Section: Study Areamentioning

confidence: 99%

GIS-Analysis for Active Tectonics Assessment of Wadi Al-Arish, Egypt

et al. 2023

View full text Add to dashboard Cite

In this paper, we apply an effective method to evaluate relative tectonic activity by applying several morph-tectonic indices that are useful in evaluating topography and tectonics. These indices include stream length-gradient, asymmetric factor, hypsometric index, hypsometric curves, valley floor width to valley height ratio, drainage basin shape, and mountain front sinuosity. The study region of Wadi Al-Arish in northern Sinai Peninsula in northern Egypt is a natural laboratory to examine relative tectonic activity levels for calculating morpho-tectonic indices of several catchments and sub-catchments rather than an individual catchment. Northern Sinai, comprising the Waid Al-Arish area, is characterized by several large inversion anticline folds. The cumulative results extracted from morpho-tectonic indices ae presented as a new index, namely relative tectonic activity level (RTAL), which we classified into four levels: low, moderate, high, and very high relative tectonic activity. Therefore, the study region provides different levels of relative tectonic activity resulting from fault patterns affecting the northern Sinai inversion forms. The paper examines the concept that regions with various levels of tectonic activity are associated with specific values of RTAL.

show abstract

زلزالية شبه جزيرة سيناء - مصر

Abstract: The

Cited by 21 publications

References 42 publications

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

Crustal thickness and structural pattern evaluation of Sinai Peninsula using three-dimensional density modeling with aeromagnetic and earthquake data

Seismicity and seismotectonics of the Red Sea Region

GIS-Analysis for Active Tectonics Assessment of Wadi Al-Arish, Egypt

Contact Info

Product

Resources

About