Spatial Variability of Shear Wave Velocity Using Geostatistical Analysis in Mashhad City, NE Iran
Author(s)
Azam Ghazi,
Naser Hafezi Moghadas,
Hossein Sadeghi,
Mohammad Ghafoori,
Gholam Reza Lashkaripour
Affiliation(s)
Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
ABSTRACT
Shear wave velocity (Vs) is one of the most important parameters of a geological model to assess the site effect and the ground response. In this paper the spatial variability of shear wave velocity in Mashhad capital city are investigated. For this purpose, 243 Vs profiles of different projects throughout the city were used. Based on the Vs profiles the iso-level maps of the Vs interfaces 300, 500, 750, 950 and 1200 m/s were obtained by kriging interpolation method. The best semivariogram models were obtained with changing the effective parameters and assessing the components of the models and spatial dependence. The best models for the entire interfaces were exponential. Based on these models, the spatial dependence of depth data was moderate to strong. The performance of interpolations was checked by cross-validation and its indices i.e. mean standardized prediction errors (MSPR), root mean square prediction errors (RMSPE), average kriging standard error (AKSE), and root mean square standardized prediction errors (RMSSPE) were assessed. A trend of depth increasing towards the northeast was observed at all of the interfaces.
Cite this paper
Ghazi, A. , Moghadas, N. , Sadeghi, H. , Ghafoori, M. and Lashkaripour, G. (2014) Spatial Variability of Shear Wave Velocity Using Geostatistical Analysis in Mashhad City, NE Iran. Open Journal of Geology, 4, 354-363. doi: 10.4236/ojg.2014.48027.
Ghazi, A. , Moghadas, N. , Sadeghi, H. , Ghafoori, M. and Lashkaripour, G. (2014) Spatial Variability of Shear Wave Velocity Using Geostatistical Analysis in Mashhad City, NE Iran. Open Journal of Geology, 4, 354-363. doi: 10.4236/ojg.2014.48027.
References
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http://dx.doi.org/10.1007/s12665-012-2095-z [21] Zhang, R., Kravchenko, A. and Tung, Y.K. (1995) Spatial and Temporal Distribution of Precipitation in Wyoming. 15th Proceeding of Annual American Geophysical Union Hydrology Days, Fort Collins, CO, AGU, Washington, DC, 377-388. [22] Hafezi Moghaddas, N., Ghafoori, M. and Ghazi, A. (2007) Investigation of Empirical Relationship between Shear Wave Velocity and N-SPT throughout the Mashhad City. 25th Annual Meeting of Earth Sciences, 145-152.