Journal ArticleDOI
Seismic Site Classification and Correlation between Standard Penetration Test N Value and Shear Wave Velocity for Lucknow City in Indo-Gangetic Basin
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In this article, a detailed shallow subsurface investigations and borehole analysis was carried out by carrying out 47 seismic surface wave tests using multichannel analysis of surface waves (MASW) and 23 boreholes with standard penetration test (SPT) N values.Abstract:
Subsurface lithology and seismic site classification of Lucknow urban center located in the central part of the Indo-Gangetic Basin (IGB) are presented based on detailed shallow subsurface investigations and borehole analysis. These are done by carrying out 47 seismic surface wave tests using multichannel analysis of surface waves (MASW) and 23 boreholes drilled up to 30 m with standard penetration test (SPT) N values. Subsurface lithology profiles drawn from the drilled boreholes show low- to medium-compressibility clay and silty to poorly graded sand available till depth of 30 m. In addition, deeper boreholes (depth >150 m) were collected from the Lucknow Jal Nigam (Water Corporation), Government of Uttar Pradesh to understand deeper subsoil stratification. Deeper boreholes in this paper refer to those with depth over 150 m. These reports show the presence of clay mix with sand and Kankar at some locations till a depth of 150 m, followed by layers of sand, clay, and Kankar up to 400 m. Based on the available details, shallow and deeper cross-sections through Lucknow are presented. Shear wave velocity (SWV) and N-SPT values were measured for the study area using MASW and SPT testing. Measured SWV and N-SPT values for the same locations were found to be comparable. These values were used to estimate 30 m average values of N-SPT (N
30) and SWV (V
s
30
) for seismic site classification of the study area as per the National Earthquake Hazards Reduction Program (NEHRP) soil classification system. Based on the NEHRP classification, the entire study area is classified into site class C and D based on V
s
30
and site class D and E based on N
30. The issue of larger amplification during future seismic events is highlighted for a major part of the study area which comes under site class D and E. Also, the mismatch of site classes based on N
30 and V
s
30
raises the question of the suitability of the NEHRP classification system for the study region. Further, 17 sets of SPT and SWV data are used to develop a correlation between N-SPT and SWV. This represents a first attempt of seismic site classification and correlation between N-SPT and SWV in the Indo-Gangetic Basin.read more
Citations
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Journal ArticleDOI
Correlation of densities with shear wave velocities and SPT N values
TL;DR: In this paper, the correlation between the density (dry and wet density) and V-s/SPT (standard penetration test) N values using measured data has been derived for all soil types as well as finegrained and coarse-grained soil types.
Journal ArticleDOI
Seismic site classification and correlation between V-S and SPT-N for deep soil sites in Indo-Gangetic Basin
Ketan Bajaj,P. Anbazhagan +1 more
TL;DR: In this paper, a surface wave survey was used for determining the shear wave velocity (V S ) variation with depth at 276 locations in the Indo-Gangetic Basin (IGB) using low-frequency geophones by performing combined active (Multichannel analysis of surface waves, MASW) and passive (Ambient Noise) surveys.
Journal ArticleDOI
Seismic hazard analysis of Lucknow considering local and active seismic gaps
TL;DR: In this article, the study area of the Lucknow urban centre which lies within 350 km from the central seismic gap has been considered for detailed assessment of seismic hazard. And the seismic hazard of Lucknow has been studied based on deterministic and the probabilistic seismic hazard analysis.
Journal ArticleDOI
SPT blow count vs. shear wave velocity relationship in the structurally complex formations of the Molise Region (Italy)
Silvia Fabbrocino,Giovanni Lanzano,Giovanni Forte,Filippo Santucci de Magistris,Giovanni Fabbrocino +4 more
TL;DR: In this article, a rational methodology for an integrated geological and geotechnical assessment of the available field data based on lithostratigraphical features was presented and discussed, and three original empirical NSPT-VS power function relationships were derived and distinguished depending on the main lithofacies recognized in the Campobasso District, corresponding to Structured Soil Deposit (SSD), All Soils (AS) and Weathered Soils(WS).
Journal ArticleDOI
Seismic hazard maps and spectrum for Patna considering region-specific seismotectonic parameters
TL;DR: In this article, the authors developed the seismic hazard maps of Patna district considering the region-specific maximum magnitude and ground motion prediction equation (GMPEs) by worst-case deterministic and classical probabilistic approaches.
References
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Journal ArticleDOI
Multichannel analysis of surface waves
TL;DR: In this article, a multichannel shot gather is decomposed into a swept-frequency record, allowing the fast generation of an accurate dispersion curve, which can then be examined and its effects appraised in both frequency and offset space.
Journal ArticleDOI
Estimation of near‐surface shear‐wave velocity by inversion of Rayleigh waves
TL;DR: In this paper, an iterative solution technique to the weighted equation proved very effective in the high frequency range when using the Levenberg-Marquardt and singular value decomposition techniques.
Journal ArticleDOI
Estimates of Site‐Dependent Response Spectra for Design (Methodology and Justification)
TL;DR: In this paper, the authors provide new unambiguous definitions of site classes and rigorous empirical estimates of site-dependent amplification factors in terms of mean shear-wave velocity and input ground-motion level.
Journal ArticleDOI
Evaluation of Liquefaction Potential Using Field Performance Data
TL;DR: In this article, a simplified procedure for evaluating the liquefaction potential of sand deposits using data obtained from standard penetration tests is reviewed, and the results of this study are then extended to other magnitude earthquakes using a combination of laboratory and field data.
Journal ArticleDOI
Empirical shear wave velocity equations in terms of characteristic soil indexes
Yutaka Ohta,Noritoshi Goto +1 more
TL;DR: In this paper, an investigation to systematize empirical equations for the shear wave velocity of soils was made in terms of four characteristic indexes: the N-value of the standard penetration test, depth where the soil is situated, geological epoch and soil type.
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