Sambit Psrasanajit Naik | IIT Kanpur (original) (raw)

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Papers by Sambit Psrasanajit Naik

Natural hazards, May 8, 2024

CRC Press eBooks, Aug 8, 2022

AGU Fall Meeting Abstracts, Dec 1, 2018

Journal of Geodynamics, May 1, 2022

$Research paper thumbnail of Interpretation of deformation history based on the structures and characteristics of fracture-controlled dykes$

AGU Fall Meeting Abstracts, Dec 1, 2019

Economic and Environmental Geology, Feb 28, 2020

GeoCongress 2012, Mar 29, 2012

In the present study seismic hazard assessment in terms of ground response analysis and liquefact... more In the present study seismic hazard assessment in terms of ground response analysis and liquefaction potential has been carried out for the Allahabad city, India. The study area is having threat to seismic damage due to Himalayan Frontal Thrust earthquake. Three sites under the study have been characterized by means of in-situ SPT and laboratory tests on representative and undisturbed samples. Three boreholes were drilled at three different locations and SPT blow counts (N) was recorded at 1.5m interval up to a depth of 30m. The liquefaction analysis has been carried out using method suggested by Seed and Idriss (1970). The peak ground acceleration (PGA) values obtained from the analysis were used for the computation of CSR and SPT values for evaluation of CRR. PGA obtained from the analysis ranges from 0.063 to 1.5g. The study revealed that the soil below 10m depth in Allahabad city is susceptible to liquefaction. The post liquefaction settlement analysis of Allahabad soil shows an average settlement of 20 to 70cm.

Quaternary International, 2020

Abstract On 26th January 2001, an earthquake of magnitude Mw 7.7 occurred near Bhuj, in northwest... more Abstract On 26th January 2001, an earthquake of magnitude Mw 7.7 occurred near Bhuj, in northwestern India, resulting in severe environmental effects. No unequivocal primary surface rupture was observed for the earthquake, but it caused widespread liquefaction and lateral spreading in the Rann of Kachchh and Little Rann. After the earthquake, several researchers collected field evidence of secondary surface rupture, rockfall, dry craters, and surface manifestations of liquefaction, including the formation of mud volcanoes and lateral spreads, in the meizoseismal area. Analysis of pre- and post-earthquake satellite images suggests that several “dry” streams in the Rann of Kachchh began to flow due to extensive liquefaction induced by the earthquake. In this present study, the macroseismic intensity of the Bhuj earthquake is evaluated by considering these environmental effects and applying the ESI-07 intensity scale to the affected area. As an outcome, the epicentral intensity of the 2001 Bhuj earthquake was determined to be XI. According to historical records and seismic catalogs, 16th June 1819 Allah Bund earthquake caused prominent surface rupture which was not so clear in the case of 2001 Bhuj earthquake, but the secondary effects were similar for both earthquakes. Considering the environmental effects caused by the 1819 Allah Bund earthquake, an intensity of XI was estimated for the epicentral area. For both earthquakes, the ESI scale yields a significant difference of one to two degrees with the traditional intensity scales. The 2001 Bhuj earthquake and 1819 Allah Bund earthquake shows similar ESI-07 intensity of XI despite of different epicentral locations. This implies the reliability of ESI-07 scale application for different earthquakes of similar dimensions in the same geological setting. This study contributes to the application of ESI-07 scale for Indian earthquakes, especially reverse faulting events, and to the future improvement of the ESI scale with emphasis on its applicability to historical earthquakes on the Indian subcontinent. Also, this study may help in future land use planning in the meizoseismal area of 1919 Allah Bund and 2001 Bhuj earthquakes.