Regional–Local Hybrid Seismic Hazard and Disaster Modeling of the Five Tectonic Province Ensemble Consisting of Westcentral Himalaya to Northeast India

Nath, Sankar Kumar; Ghatak, Chitralekha; Sengupta, Arnab; Biswas, Arpita; Madan, Jyothula; Srivastava, Anand

doi:10.1007/978-981-16-1468-2_14

Cited by 2 publications

(13 citation statements)

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“…The formulations suggested by Cornell (1968), Esteva (1970), andMcGuire (1976) provide the frequency distribution of ground motion, wherein the annual probabilities of occurrence of events greater than the specified design basis is ascertained. In the present study, PSHA for the entire Bengal Basin spanning over 2,69,463 km 2 has been conceptualized considering both the polygonal and tectonic sources together using the protocol provided by Maiti et al (2017) and Nath et al (2021a).…”

Section: Probabilistic Seismic Hazard Assessment Of Bengal Basin At T...mentioning

confidence: 99%

“…Impact intensity and the degree of damage severity due to an impending earthquake are source, path, and site dependent. The goal of urban hazard mapping is to predict earthquake-induced ground motion effects based on various sources, paths, and site Logic tree framework for computing probabilistic seismic hazard at each node of the study region (adopted from Nath et al, 2014;Maiti et al, 2017;and Nath et al, 2021a).…”

Section: Site Characterizationmentioning

confidence: 99%

“…This phenomenon causes the soil to lose its cohesive strength and flow like liquid (Hazen, 1918). Bengal Basin is extremely vulnerable to liquefaction as evidenced in the cities of Dhaka (Rahman et al, 2015;Nath et al, 2021a), Chittagong (Rahman et al, 2020), Kolkata (Nath et al, 2018;Nath et al, 2022), and partially in the state of West Bengal (Nath et al, 2022). A systematic soil liquefaction analysis has been performed for Bengal Basin using geotechnical data acquired for the purpose of simulating liquefaction susceptibility potential due to significant historical earthquakes and to predict probabilistic scenario of the basin.…”

Section: Liquefaction Analysismentioning

confidence: 99%

“…Kolkata (Nath, 2016), Dhaka (Rahman et al, 2018), Sylhet (Rahman et al, 2019), and Khulna (Sarkar et al, 2015). Nath et al (2021a) proposed depth-dependent lithology-based formulations for V S as a function of corrected SPT-N for Bengal Basin, which has been extensively used in the present study. Thus, effective shear wave velocity (V S…”

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confidence: 99%

“…The Chittagong Hill tract and patches of Sylhet and Rangpur are deprived of sufficient geotechnical and/or geophysical data. Nath et al (2021a) suggested empirical relations for the rugged topography of the Northeast Indian region where shear wave velocity has been estimated from surface geology, geomorphology, slope, and landform. Henceforth, these factors have been combined by establishing an empirical relation through a nonlinear regression analysis for characterizing only the hilly tracts in the basin, as given in Eq.…”

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confidence: 99%

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Site-specific seismic hazard and risk potential of Bengal Basin with emphasis on holistic seismic hazard microzonation and its structural impact assessment in the cities of Dhanbad and Mymensingh

et al. 2022

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The Bengal Basin located in the eastern part of the Indian subcontinent at the conjunction of the Eurasian, Indian, and Indo-Burma plates with two progressing deformation fronts viz. the Himalayas and the Indo-Burmese orogenic belts is one of the largest fluvio-deltaic to shallow marine sedimentary basin covered by alluvial plains of Holocene deposits extending from the Himalayas to the Bay of Bengal over thick younger alluvium comprising shallow layers of silt, clay, and sand that can have disastrous consequences due to site-specific ground motion amplification and liquefaction effects. The basin surrounded by Shillong and Assam plateaus in the Northeast is in the active tectonofabric of major active faults and lineaments triggering many devastating earthquakes in the past implicating the MM Intensity of VIII–XI in the near-source region causing widespread damage and destruction in the basin, thus bringing in the essence of assessing surface level seismic hazard and the risk imposed on the basin. Consideration of seismicity patterns, fault networks, and similarity in focal mechanisms yielded 49 areal seismogenic sources and additional active tectonic features in the 0–25 km, 25–70 km, and 70–180 km hypocentral depth ranges, which along with 14 ground motion prediction equations that include site-specific next generation spectral attenuation models pertaining to Northeast India, East-Central Himalaya, and Bengal Basin tectonic provinces yielded probabilistic peak ground acceleration (PGA) at engineering bedrock in the range of 0.08–0.58 g. Both the geophysical and geotechnical investigations at 6,000 sites provided effective shear wave velocity distribution in the range of 113–948 m/s on the geographical information system, thus classifying the basin into 11 site classes with “None” to “Severe” liquefaction hazard potential. A systematic non-linear/equivalent linear site response analysis and its spectral convolution with firm rock peak ground acceleration yielded surface-consistent hazard in the range of 0.09–1.17 g, thus opening up the issue of risk assessment and holistic seismic hazard microzonation of all the cities in the basin and their structural impact assessment using the SELENA-based capacity spectrum method on FEMA and BMTPC-regulated 11 model building types in the damage states of “none,” “slight,” “moderate,” “extensive,” and “complete” for all of those, however, in-depth studies carried out for Mymensingh and Dhanbad have been presented.

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Section: Probabilistic Seismic Hazard Assessment Of Bengal Basin At T...mentioning

confidence: 99%

Section: Site Characterizationmentioning

confidence: 99%

Section: Liquefaction Analysismentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Site-specific seismic hazard and risk potential of Bengal Basin with emphasis on holistic seismic hazard microzonation and its structural impact assessment in the cities of Dhanbad and Mymensingh

et al. 2022

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Site-characterization using 1D/2D/3D Site Response Modelling vis-à-vis Surface-consistent Probabilistic Seismic Hazard, Microzonation and Damage Potential Studies in the Six-Tectonic Ensemble consisting of Kashmir Himalaya to Northeast India

Nath,

Biswas,

Srivast

et al. 2024

Preprint

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Indian subcontinent, marked by its intricate seismotectonic settings stands out as the most active region in the globe. This study conducts a firm rock-compliant Probabilistic Seismic Hazard Assessment considering both tectonic and polygonal sources in 0-25km, 25-70km, 70-180km, and 180-300km depth ranges, Next Generation Attenuation models through a logic tree framework across the Tectonic Ensemble from Kashmir Himalaya to Northeast India encompassing six seismogenic tectonic provinces classifying the Ensemble in the 'High' to 'Severe' hazard regime, highlighting the need for a site-specific surface-consistent investigation that shear-wave velocity characterises the Ensemble into 11 site classes and estimates Surface-consistent Probabilistic Seismic Hazard of the Ensemble in the range of 0.25-2.91g for 475 years of return period using a systematic 1D/2D/3D site response analysis. Liquefaction Potential and Landslide Susceptibility Index adds secondary hazard to both geohazard and seismic hazard regime for a comprehensive seismic hazard microzonation of the important Cities and urban centres in the Tectonic Ensemble. The damage states modelled using capacity spectrum method on prevailing building types for the Surface-consistent Probabilistic PGA by SELENA are found to be well-aligned with the reported damage scenarios of A1, URM, and RC buildings triggered by large historical earthquakes in each of the tectonic provinces.

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Regional–Local Hybrid Seismic Hazard and Disaster Modeling of the Five Tectonic Province Ensemble Consisting of Westcentral Himalaya to Northeast India

Cited by 2 publications

References 33 publications

Site-specific seismic hazard and risk potential of Bengal Basin with emphasis on holistic seismic hazard microzonation and its structural impact assessment in the cities of Dhanbad and Mymensingh

Site-specific seismic hazard and risk potential of Bengal Basin with emphasis on holistic seismic hazard microzonation and its structural impact assessment in the cities of Dhanbad and Mymensingh

Site-characterization using 1D/2D/3D Site Response Modelling vis-à-vis Surface-consistent Probabilistic Seismic Hazard, Microzonation and Damage Potential Studies in the Six-Tectonic Ensemble consisting of Kashmir Himalaya to Northeast India

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