Phase velocity of the Arabian platform and the surface waves attenuation characteristics by wave form modeling
Other Title(s)
سرعة الطور للرصيف العربي و خواص التوهين له باستخدام نمذجة شكل الموجة
Author
Source
Journal of King Abdulaziz University : Earth Sciences
Issue
Vol. 8, Issue 1 (31 Dec. 1995), pp.23-45, 23 p.
Publisher
King Abdulaziz University Scientific Publishing Center
Publication Date
1995-12-31
Country of Publication
Saudi Arabia
No. of Pages
23
Main Subjects
Earth Sciences, Water and Environment
Topics
Abstract AR
تمت دراسة التركيب القشري تحت الرصيف العربي باستخدام المعلومات الزلزالية المتاحة من محطة الرياض.
وجدت سرعة الطور على طول 14 مسارا باستخدام طريقة المصفى الموافق للطور.
و وجد أن سرعات الطور تزيد من ٣ ر ٢ كم / ث عند ٤ ثوان إلى 4,1 كم / ث عند ٤٢ ثانية جمعت السرعات للطور وللمجموعة و استخدمت انعكاس لاستنباط نموذج زلزالي لموجة S.
النموذج المتحصل عليه أدمج مع نمونج ل Q يمثل المنطقة و حسبت الرسومات الزلزالية النظرية.
و بمقارنة الرسومات الزلزالية الشاهدة و النظرية وجد أن نموذج سرعة القص المحسوب في هذه الدراسة قد أعطى توافقا ممتازا بين الرسومات الشاهدة و تلك المحسوبة و هذه الطريقة يمكن استخدامها لدراسة خواص التوهين في الرصيف العربي و كذلك الطبق العربي ؛ ككل.
Abstract EN
The crustal structure beneath the Arabian platform has been investigated using available seismic records produced at the Riyadh (RYD) Station.
The phase velocities along 14 individual propagation paths were determined using the phase matched filter technique.
The phase velocities were found to increase from 2.3 km / s at 4 s to 4.1 km / s at 42 s.
Phase and group velocities were combined and used to invert for an S wave seismic crustal velocity structure.
The inversion process produced a model with B (the shear velocity) between 1.48-2.41 km / s in the top 3 km which repre¬sents the sedimentary cover rocks.
The upper crust B increases from 3.1 at 5 km to 3.67 km / s at 25 km depth.
The Lower crust is about 20 km thick, and its B increases rapidly from 3.76 km to 4.43 km / s.
The Moho discontinuity is at about 45 km depth with an average B of about 4.7 km / s.
The resulting shear velocity model was then combined with the Q model representative of the region, and synthetic seismograms were computed.
Comparison bet¬ween the observed data and theoretical results showed that the shear wave velocity model of the Arabian platform obtained in this study produces ex¬cellent match between recorded and computed seismograms.
This proce¬dure is suggested as a tool that can be used to study the attenuation charac¬teristics of the Arabian platform as well as the Arabian plate.
American Psychological Association (APA)
Mukhtar, Talal Ali. 1995. Phase velocity of the Arabian platform and the surface waves attenuation characteristics by wave form modeling. Journal of King Abdulaziz University : Earth Sciences،Vol. 8, no. 1, pp.23-45.
https://search.emarefa.net/detail/BIM-396519
Modern Language Association (MLA)
Mukhtar, Talal Ali. Phase velocity of the Arabian platform and the surface waves attenuation characteristics by wave form modeling. Journal of King Abdulaziz University : Earth Sciences Vol. 8, no. 1 (1995), pp.23-45.
https://search.emarefa.net/detail/BIM-396519
American Medical Association (AMA)
Mukhtar, Talal Ali. Phase velocity of the Arabian platform and the surface waves attenuation characteristics by wave form modeling. Journal of King Abdulaziz University : Earth Sciences. 1995. Vol. 8, no. 1, pp.23-45.
https://search.emarefa.net/detail/BIM-396519
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 43-44
Record ID
BIM-396519