Document Details

Document Type : Article In Journal 
Document Title :
Surface Wave Velocities Across Arabia
سرعات الموجة السّطحيّة عبر الجزيرة العربيّة
 
Subject : Surface Wave Velocities Across Arabia 
Document Language : English 
Abstract : The group-velocity distribution beneath the Arabian Plate is investigated using Love and Rayleigh waves. We obtained a balanced path coverage using seismograms generated by earthquakes located along the plate boundaries. We measured Love-and Rayleigh-wave group-velocity dispersion using multiple flter analysis and then performed a tomographic inversion using these observations to estimate lateral group velocity variations in the period range of 5-60 s. The Love-and Rayleigh-wave results are consistent and show that the average group velocity across Arabia increases with increasing period. The tomographic results also delineate frst-order regional structure heterogeneity as well as the sharp transition between the Arabian shield and the Arabian platform. Systematic diferences are observed in the distribution of the short-period group velocities across the two provinces, which are consistent with surface geology. The slower velocities in the platform reveal the imprint of its thick sedimentary section, while faster velocities correlate well with the exposed volcanic fows in the shield. Shear-wave velocity models for the two regions, obtained from the inversion of the group velocities, confrm results from previous studies of higher S-wave velocity in the upper crust beneath the shield. This may be due to the presentremnants ofthe oceaniccrust(ophiolitebelts)associatedwiththeislandarcsevolutionarymodel of the Arabian shield. The mapping of the surface-wave group velocity using a large data can be used in constraining the regional structure at existing and planned broadband stations deployed in this tectonically complex region as part of the seismic monitoring under CTBT. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 158 
Issue Number : 8 
Publishing Year : 1421 AH
2001 AD 
Article Type : Article 
Added Date : Tuesday, February 15, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
طلال مختارMukhtar, Talal ResearcherDoctorate 

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