scholarly journals Volcanic history of the northernmost part of the Harrat Rahat volcanic field, Saudi Arabia

Geosphere ◽  
2018 ◽  
Vol 14 (3) ◽  
pp. 1253-1282 ◽  
Author(s):  
Drew T. Downs ◽  
Mark E. Stelten ◽  
Duane E. Champion ◽  
Hannah R. Dietterich ◽  
Zohair Nawab ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Volcanic Field ◽  
Volcanic History ◽  
Harrat Rahat ◽  
History Of

Crustal structure of the northern Harrat Rahat volcanic field (Saudi Arabia) from gravity and aeromagnetic data

2019 ◽  
Vol 750 ◽  
pp. 9-21 ◽  
Author(s):  
V.E. Langenheim ◽  
B.T. Ritzinger ◽  
Hani Zahran ◽  
Adel Shareef ◽  
Maher Al-dahri
Keyword(s):  
Saudi Arabia ◽  
Crustal Structure ◽  
Volcanic Field ◽  
Aeromagnetic Data ◽  
Harrat Rahat

scholarly journals Geologic map of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia

2019 ◽  
Author(s):  
Drew T. Downs ◽  
Joel E. Robinson ◽  
Mark E. Stelten ◽  
Duane E. Champion ◽  
Hannah R. Dietterich ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Volcanic Field ◽  
Kingdom Of Saudi Arabia ◽  
Harrat Rahat ◽  
Geologic Map

Crustal imaging of northern Harrat Rahat, Saudi Arabia, from ambient noise tomography

2019 ◽  
Vol 219 (3) ◽  
pp. 1532-1549 ◽  
Author(s):  
F Civilini ◽  
W D Mooney ◽  
M K Savage ◽  
J Townend ◽  
H Zahran
Keyword(s):  
Saudi Arabia ◽  
Surface Wave ◽  
Shear Wave ◽  
Magma Chamber ◽  
Lower Crust ◽  
Volcanic Field ◽  
Surface Wave Dispersion ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Harrat Rahat

SUMMARY Harrat Rahat is a volcanic field located in west-central Saudi Arabia and is the site of the most recent eruption in the country (1256 CE). An earthquake swarm at a nearby volcanic field in 2009 prompted the need for new hazard models for this region, which includes the holy city of Medina. Tomography studies can be used to infer material properties of the subsurface such as partial melt, and are instrumental for volcanic hazard assessment. Regional earthquakes have been used to determine mantle structure, but such crustal models are often hindered by an insufficient number of earthquakes in the plate interior. We use ambient seismic noise to compute Rayleigh and Love surface-wave dispersion maps between 5 and 12 s for northern Harrat Rahat. The surface-wave maps are inverted to produce shear-wave velocities using a neighbourhood algorithm and interpolated into a pseudo-3-D model. The distributions of surface-wave and shear-wave velocities are heterogenous, varying between ±3 and 8 per cent. However, low velocities are not restricted to the Harrat. We observed a difference between Rayleigh- and Love-wave velocities that extends north from the site of the 1256 CE eruption and coincides with a low gravity anomaly. We obtain a shear-wave velocity increase of 10–15 per cent between 15 and 25 km depth consistent with the Conrad discontinuity, the interface between andesitic upper crust and the mafic lower crust of the Arabian Shield. The average velocities of the upper and lower crust are estimated to be 3.64 and 3.95 km s–1 using Rayleigh waves and 3.53 and 4.16 km s–1 using Love waves, which are in good agreement with the results of other geophysical studies of this area. The magnitude of the low-velocity anomalies, their location away from the Harrat, and the lack of reversals in the shear-velocity inversions suggest that the presence of a crustal magma chamber is not likely. If a magma chamber exists, it is smaller than can be imaged with a secondary microseism source (approximately 15 km wavelength), deeper than 30 km, or shallower than 5 km with a small velocity contrast.

Timescales of magmatic differentiation from alkali basalt to trachyte within the Harrat Rahat volcanic field, Kingdom of Saudi Arabia

2018 ◽  
Vol 173 (8) ◽  
Author(s):  
Mark E. Stelten ◽  
Drew T. Downs ◽  
Hannah R. Dietterich ◽  
Gail A. Mahood ◽  
Andrew T. Calvert ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Alkali Basalt ◽  
Volcanic Field ◽  
Magmatic Differentiation ◽  
Kingdom Of Saudi Arabia ◽  
Harrat Rahat

Suicidal Ideation Among Medical Students in Dammam, Saudi Arabia

Crisis ◽  
2020 ◽  
pp. 1-6
Author(s):  
Mohammed Madadin ◽  
Ritesh G. Menezes ◽  
Maha A. Alassaf ◽  
Abdulaziz M. Almulhim ◽  
Mahdi S. Abumadini ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Medical Students ◽  
Suicidal Ideation ◽  
General Health Questionnaire ◽  
Cross Sectional Study ◽  
Eastern Province ◽  
Cross Sectional ◽  
The Past ◽  
Depression Subscale ◽  
History Of

Abstract. Background: Medical students are at high risk of suicidal ideation. Aim: We aimed to obtain information on suicidal ideation among medical students in Dammam located in the Eastern Province of Saudi Arabia. Method: This cross-sectional study was conducted at the College of Medicine affiliated with Imam Abdulrahman Bin Faisal University in the Eastern Province of Saudi Arabia. Suicidal ideation in the past 12 months was assessed based on responses to four questions in the depression subscale of the General Health Questionnaire 28 (GHQ-28). In addition, data were collected to examine the association of suicidal ideation with various factors. Results: We found that 1 in 3 medical students in the study had suicidal ideation in the past 12 months, while around 40% had lifetime suicidal ideation. Suicidal ideation was associated with feelings of parental neglect, history of physical abuse, and dissatisfaction with academic performance. Limitations: The cross-sectional nature of this study limits its ability to determine causality regarding suicidal ideation. Conclusion: These rates are considerably high when compared with rates from studies in other countries around the world. This study provides a reference in the field of suicidology for this region of Saudi Arabia.

THE ROLE AND ROLE OF OIL POLICY IN SAUDI ARABIA IN POST WORLD WAR II ECONOMIC LIFE

2019 ◽  
Vol 20 (2) ◽  
pp. 37-41
Author(s):  
Maftuna Sanoqulova ◽  
Keyword(s):  
Saudi Arabia ◽  
World War Ii ◽  
Economic Life ◽  
World War ◽  
Post World War Ii ◽  
The World ◽  
History Of ◽  
Oil Policy

This article consists of the politics which connected with oil in Saudi Arabia after the World war II , the relations of economical cooperations on this matter and the place of oil in the history of world economics

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