Surface level ground motion estimation for 1869 Cachar earthquake (<i>M<sub>w</sub></i>7.5) at Imphal city

Pallav, Kumar; Raghukanth, S. T. G.; Singh, Konjengbam Darunkumar

doi:10.1088/1742-2132/7/3/010

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Among these tectonic blocks the IBR, SP and BB, are closer to Imphal, which makes the city more susceptible to the earthquakes originating in these seismic zones. The geographical, geological and seimicity features in and around were discussed in our previous work (Raghukant et al, 2009;Pallav et al, 2010).…”

Section: Seismotectonic Settingmentioning

confidence: 85%

“…In the present work, liquefaction potential status of Imphal city has been evaluated by means of two indices, i.e., deterministic index LPI (Liquefaction Potential Index) and probabilistic index LSI (Liquefaction Severity Index), for 1869 Cachar event (M w 7.5, PGA=0.16g) which occurred along the Kopili fault and probable future great earthquake (M w 8.1, PGA=0.3g) in the Indo-Burmese subduction zone. PGA values estimated by Raghukanth et al (2009) and Pallav et al (2010) based on stochastic finite fault model proposed by Motazedian and Antkinson (2005) are used for finding the liquefaction hazard of Imphal city. Computation of LPI and LSI requires Factor of Safety against liquefaction of each soil layer as an input.…”

Section: Introductionmentioning

confidence: 99%

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Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Pallav

Raghukanth

Singh

2012

International Journal of Geotechnical Earthquake Engineering

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In the present article liquefaction potential of Imphal city is reported in the form of two indices, i.e., LPI (Liquefaction Potential Index) and LSI (Liquefaction Severity Index), for 1869 Cachar earthquake (Mw 7.5) along the Kopili fault and probable future great earthquake (Mw 8.1) in the Indo-Burma subduction zone. The Factor of Safety (FS) against liquefaction has been computed by using modified procedure given by Idriss and Boulanger (2006) for all depths of 122 boreholes. The computed FS have been used as input parameters for evaluating LPI and LSI indices for Imphal City. Based on these LPI and LSI indices, liquefaction potential hazard contour maps of Imphal city is prepared. It is observed that over a large area of Imphal city is highly vulnerable to liquefaction failure in the events of the selected earthquake. The liquefaction hazard obtained at each site exhibits a good agreement with the damages documented for 1869 Cachar earthquake. This contour map can be served as a guideline for engineer and planner in site selection for upcoming projects and helps city administration in mitigating the city from future hazards.

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Section: Seismotectonic Settingmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Pallav

Raghukanth

Singh

2012

International Journal of Geotechnical Earthquake Engineering

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“…Seismotectonic features in a broad region around Imphal city have been identified and described basing on the seismotectonic atlas of India (GSI 2000). Figure 3 (after Pallav et al 2010Pallav et al , 2012 shows that almost the entire region around Imphal city is surrounded by faults. These faults contribute to tectonic activity in the region, which is mainly due to the interaction between the north-south convergence along the Himalayan boundary, and east-west convergence along the IBR.…”

Section: Seismic Setup Around Imphal Citymentioning

confidence: 99%

“…These methods are successfully validated for Imphal city Pallav et al 2010). Altogether 700-earthquake time-history has been generated for different combinations of magnitudes (M w of 5-8.5) and distances (20-200 km) from the faults under consideration and their mean Peak Ground Acceleration (PGA) distribution is shown in Fig.…”

Section: Determination Of Rock Level Acceleration Time Historiesmentioning

confidence: 99%

Estimation of Seismic Site Coefficient and Seismic Microzonation of Imphal City, India, Using the Probabilistic Approach

2015

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A b s t r a c t Seismic site coefficients (F s ) for Imphal city have been estimated based on 700 synthetically generated earthquake time histories through stochastic finite fault method, considering various combinations of magnitudes and fault distances that may affect Imphal city. Seismic hazard curves and Uniform Hazard Response Spectra (UHRS) are presented for Imphal city. F s have been estimated based on site response analyses through SHAKE-91 for a period range of engineering interest (PGA to 3.0 s), for 5% damping. F s were multiplied by UHRS values to obtain surface level spectral acceleration with 2 and 10% probability of exceedance in 50 year (~2500 and ~500 year) return period. Comparison between predicted mean surface level response spectra and IS-1893 code shows that spectral acceleration value is higher for longer periods (i.e., > 1.0 s), for ~500 year return period, and lower for periods shorter than 0.2 s for ~2500 year return period.

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“…The prime source parameters that determine PGA are earthquake size and epicentral distance. Many studies dealing with site effect, microzonation, estimation of ground motion, and seismic hazard were done by different workers in Northeast India (Nath et al, 2008(Nath et al, & 2009Pallav et al, 2010;Baruah et al, 2009, 2011, Sil et al, 2013, Erteleva et al, 2014, Gogoi et al 2023. Raghukanth and Somala, 2009 has used point source seismological model to model the available strong motion acclerograms in North-eastern India.…”

Section: Introductionmentioning

confidence: 99%

Scaling and Integration of site specific fourier spectra, response spectra, design response and ratios of H/V spectra of earthquakes in North-eastern India and vicinity : implication in seismic hazard assessment

Sharma

Baruah

Gogoi

2023

Preprint

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Understanding the behaviour of soil and site in highly seismically active Assam valley, Shillong-Mikir Hills Plateau and Eastern Himalayan Syntaxis of Northeastern India is important for seismic hazard assessment. Constrained by this tectonic interaction, we estimate the ground motion parameters of these tectonic domains through the inversion of 129 three component strong motion records of earthquakes with magnitude Mw>4.0 & Mw<6.0. Remarkably, parameters estimated at 9 different sites help to classify the region into four different site class subjected to magnitude and epicentral distance of the earthquake. Higher spectral acceleration observed at low period in Diphu, Nongstoin, Tezpur and Guwahati infer embedded site condition as rock subjected to removal of source and path effect. On the other, low spectral acceleration at high period in Kokrajhar, Golaghat, Goalpara and Nagaon indicate distinctly thick alluvial basin. Fourier spectrum width in Guwahati, Diphu, Nongstoin and Tezpur, within 2-10 Hz indicate the presence of compact & hard subsurface strata while the broad spectrum width of Kokrajhar, Golaghat, Boko, Nagaon and Goalpara within 0.5 – 10 Hz suggests presence of loose alluvium soil or soft sediments. Simultaneously, site specific response study on 11/08/2009, M5.6 Myanmar-Manipur Border earthquake indicate that high spectral acceleration is evolved due to thrust mechanism. This integrative approach comprising site specific fourier spectra, design response, influence of fault type and horizontal to vertical spectral amplitude ratios offer an unique method to characterize the site in various seismically active regions of the world.

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Surface level ground motion estimation for 1869 Cachar earthquake (M_w7.5) at Imphal city

Cited by 7 publications

References 10 publications

Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Estimation of Seismic Site Coefficient and Seismic Microzonation of Imphal City, India, Using the Probabilistic Approach

Scaling and Integration of site specific fourier spectra, response spectra, design response and ratios of H/V spectra of earthquakes in North-eastern India and vicinity : implication in seismic hazard assessment

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Surface level ground motion estimation for 1869 Cachar earthquake (Mw7.5) at Imphal city

Cited by 7 publications

References 10 publications

Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Liquefaction Hazard Scenario of Imphal City for 1869 Cachar and a Hypothetical Earthquake

Estimation of Seismic Site Coefficient and Seismic Microzonation of Imphal City, India, Using the Probabilistic Approach

Scaling and Integration of site specific fourier spectra, response spectra, design response and ratios of H/V spectra of earthquakes in North-eastern India and vicinity : implication in seismic hazard assessment

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Surface level ground motion estimation for 1869 Cachar earthquake (M_w7.5) at Imphal city