Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.136..421a&link_type=abstract
Geophysical Journal International, Volume 136, Issue 2, pp. 421-430.
Astronomy and Astrophysics
Astronomy
8
Arabian Platform, Arabian Shield, Crustal Structure, Riyadh, Spectral Analysis, Upper Mantle
Scientific paper
The crustal and upper-mantle velocity structure of the interior Arabian platform is derived using the spectral analysis of long-period P-wave amplitude ratios. The ratio of the vertical to the horizontal component is utilized to obtain crustal transfer functions using the Thomson-Haskell matrix formulation for horizontally layered crustal models. 20 earthquakes recorded at the long-period station RYD between azimuths N20 degW and N150 degE were selected for the analysis based on the following criteria: focal depths in the range 5 to 215 km, body-wave magnitudes greater than 5.0, and epicentral distances in the range 7 deg to 97 deg. A careful quality check of the data left us with six events, out of 29, that had short epicentral distances (<20 deg) to be analysed. The selection criterion for the final model in the forward modelling process was based on the correlation coefficient between observed and theoretical transfer function. The model suggested that the crust consists of five distinct layers. The upper crustal layer has a P-wave velocity of about 5.6 km s^- ^1 and is about 3 km thick. The second layer has a velocity of about 6.3 km s^- ^1 and is 10 km thick. The third layer has a velocity of 6.6 km s^- ^1 and is 8 km thick. The fourth layer has a velocity of 6.9 km s^- ^1 and is 15 km thick. The lower layer has a velocity of about 7.6 km s^- ^1 and is 10 km thick. For the Mohorovicic discontinuity, a velocity of 8.3 km s^- ^1 for the upper mantle and 46 km depth are indicated.
No associations
LandOfFree
The crustal and upper-mantle structure of the interior Arabian platform does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The crustal and upper-mantle structure of the interior Arabian platform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The crustal and upper-mantle structure of the interior Arabian platform will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1032311