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Natural Hazards

, Volume 94, Issue 3, pp 1023–1041 | Cite as

Assessing shear wave velocity profiles using multiple passive techniques of Shillong region of northeast India

  • Rajib Biswas
  • S. Baruah
  • Nilutpal Bora
Original Paper
  • 58 Downloads

Abstract

Shillong region of northeast India falls under seismic zone V. Being a commercial hub, urbanization in this study region is at its peak. In order to qualitatively assess the subsurface velocity profiling of this area, we have blended two robust techniques, namely spatial autocorrelation (SPAC) and frequency wavenumber (FK) method. Corresponding to array noise data collected at five sites, situated in the close proximity of boreholes, we have evaluated VS and VP as well. The shear wave velocity estimates yielded by these techniques are found to be consistent with each other. The computed Vs values up to depth of 30 m are observed to be in the range of 275–375 m/s, in most of the sites which implies prevalence of low-velocity zone at some pocket areas. The estimates so found are systematically analyzed and implications are outlined. The results were corroborated by substantial evidence of site geology as well as geotechnical information.

Keywords

Array recordings SPAC Frequency wave number technique Shear wave 

Supplementary material

11069_2018_3453_MOESM1_ESM.pdf (11 kb)
Supplementary material 1 (PDF 10 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Geophysical Lab, Department of PhysicsTezpur UniversityNapaam, TezpurIndia
  2. 2.Geoscience DivisionC.S.I.R-North East Institute of Science and TechnologyJorhatIndia

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