Surface Soil Assessment in the Ubhur Area, North of Jeddah, Western Saudi Arabia, Using a Multichannel Analysis of Surface Waves Method

Authors

  • Maher Aldahri
     Saudi Geological Survey, Jeddah
  • Saad Mogren
     Geology and Geophysics Dept., King Saud University, Riyadh
  • Kamal Abdelrahman
     Geology and Geophysics Dept., King Saud University, Riyadh
  • Hani Zahran
     Saudi Geological Survey, Jeddah
  • Sherif El Hady
     Seismology Dept., National Research Institute of Astronomy & Geophysics
  • Mahmoud El-Hadidy
     Seismology Dept., National Research Institute of Astronomy & Geophysics

DOI:

https://doi.org/10.1007/s12594-017-0626-7

Abstract

Ten boreholes drilled in Ubhur area up to the depth of bedrock indicted the shallow depth of bedrock where the average depth ranges between 10 and 15 m. The standard penetration test Nvalues of these boreholes were measured and averaged. Based on N-values to the depth of bedrock, Ubhur area can be classified as site class C and D. Multichannel analysis of surface waves technique has been applied along seventy six profiles using 24-channel geophone array and 4.5Hz vertical geophones with 1m geophone spacing and sledgehammer and/or weight drop as seismic energy sources. Values of shear wave velocity to 30 m are calculated and then averaged (Vs30) where it ranges between 310.08 m/s and 1139.8 m/s. Therefore, Ubhur area can be classified into site class B, C and D based on site classification of the national earthquake hazards reduction program (NEHRP) recommendations. Accordingly, the greatest part of the study area falls in site class C while class B and D covered limited areas in the western and the eastern parts respectively. Depending on the shallow depth of bedrock in the study area, the Vs30 parameter is not applicable in the study area so the average values of Vs for the soil thickness, excluding the bedrock, have been calculated and mapped for site class C and D only. So Vs30 approach is not applicable for areas with shallow depth of bedrock which gives higher classification.

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Issue

Volume 89, Issue 4, April 2017 Pages (357-488)

Section

Research Articles

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Published

2017-04-01

How to Cite

Aldahri, M., Mogren, S., Abdelrahman, K., Zahran, H., El Hady, S., & El-Hadidy, M. (2017). Surface Soil Assessment in the Ubhur Area, North of Jeddah, Western Saudi Arabia, Using a Multichannel Analysis of Surface Waves Method. Journal of Geological Society of India, 89(4), 435–443. https://doi.org/10.1007/s12594-017-0626-7
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