Banerjee Soham and Kumar Abhishek (2017), Determination of S and Coda Wave Attenuation in Selected Regions of Lower and Northern Assam Within North Eastern India, Indian Geotechnical Journal, DOI 10.1007/s40098-017-0259-1

The North Eastern (NE) regions of India has been subjected to vicious damages due to numerous earthquakes (EQs). Thus, seismological study in this part of India has been a priori for a long period of time. Present study focuses to find the attenuation characteristics of selected regions within NE India. These selected regions include Guwahati […]

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Banerjee Soham, Kumar Abhishek (2017), Determination of Seismic Wave Attenuation for the Garhwal Himalayas, India, Geosciences Research, DOI: 10.22606/gr.2017.22005

Present work determines the seismic wave attenuation characteristics in the Garhwal Himalayan, India. These are obtained based on the attenuations of P, S and coda wave spectra from the recorded seismograms of nearby earthquakes (EQs) with focal depth up to 10 km. Since P and S waves come directly to the site, attenuation of P […]

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Baro Olympa, Kumar Abhishek (2017), Seismic Source characterization for the Shillong Plateau in Northeast India, Journal of Seismology, DOI: 10.1007/s10950-017-9664-2

  Present study aims at understanding the seismotectonic province of the Shillong Plateau (SP) by identifying the potential seismic source zones within a radius of 500km from the centre of the SP. From existing literature and earthquake (EQ) data the seismotectonic region is found to vary in terms of seismicity, tectonic features, geology, thickness of […]

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Kumar, A. and Mondal Joy K., (2017), Newly Developed MATLAB Based Code for Equivalent Linear Site Response Analysis, Geotechnical and Geological Engineering, DOI 10.1007/s10706-017-0246-4

Characteristics of ground motions generated during an earthquake (EQ) alter between bedrock and the surface depending upon subsoil properties. Such modifications in the ground motion characteristics are termed as local site effects. Building response as well as induced effects of EQs are thus controlled by these modified ground motions at the surface. Hence, addressing the […]

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Kumar, A. and Srinivas, B.V. (2017), Easy to Use Empirical Correlations for Liquefaction and No Liquefaction Conditions, Geotechnical and Geological Engineering, doi:10.1007/s10706-017-0183-2

Considerable damages during an earthquake (EQ) are the consequence of in-situ soil losing its shear strength which is popularly known as liquefaction. A number of methodologies are available to quantify the safety of a site against liquefaction occurrence. Widely accepted recent methodologies follow iterative process making it cumbersome for the field engineer. In the present […]

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Kumar, A., Harinarayan, N.H. and Baro, O. (2017), Nonlinear soil response to ground motions during different earthquakes in Nepal, to arrive at surface response spectra, Natural Hazards, doi:10.1007/s11069-017-2751-4

Catastrophic damages reported during an earthquake include building damages, excessive ground shaking, uneven settlements, liquefaction etc. While most of the seismic hazard studies map the probable level of ground shaking at the bedrock level, their use in assessing the above damages is very limited until the response of the local soil is also taken into […]

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Mondal K Joy, Kumar Abhishek (2016), Impact of higher frequency content of input motion upon equivalent linear site response analysis for the study area of Delhi , Geotechnical and Geological Engineering, doi:10.1007/s10706-016-0153-0

While travelling through the subsoil layers, earthquake (EQ) generated bedrock motions get modified significantly due to local soil and should be quantified using ground response analysis. Present study concentrates on equivalent linear method of site response analysis in SHAKE2000 software. It is a frequency based analysis tool having default frequency set to 15Hz. While due […]

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Soham Banerjee, Abhishek Kumar (2016), Determination of Seismic wave attenuation: A Review, Disaster Advances, Vol. 9 (6), 10-27

  Earthquake occurs when pent up energy is released during tectonic activities. This energy spreads in the form of waves and while propagating, these waves attenuate non-uniformly in different directions due to the variation in the elastic properties of the propagation medium. The recorded amplitudes of seismic waves are directly related to the attenuation properties […]

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Abhishek Kumar, Olympa, Baro, Harinarayan N H (2016), Obtaining the surface PGA from site response analyses based on globally recorded ground motions and matching with the codal values, Natural Hazards, Vol. 81, 543-572, DOI 10.1007/s11069-015-2095-x

Destructive moderate to major earthquakes (EQs) across the globe have highlighted various possible forms and extent of damages. Subsoil properties play a vital role in controlling the actual damage scenario. Induced effects such as liquefaction and landslide are also the functions of surface ground shaking. In the present work, site response analyses based on equivalent […]

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Abhishek Kumar, Harinarayan N H, Olympa Baro (2015), High Amplification factor for Low Amplitude Ground Motion: Assessment for Delhi, Disaster Advances, Vol. 8 (12), 1-11.

Building damages as well as induced effects of earthquake are the consequences of surface ground motion at the site. While due importance is given to the soil beneath the ground, the selection of input motion in site response studies is inadequate. Present work highlights the importance of bedrock motion upon the response of a soil […]

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