Influence of epicentral distance on local seismic response in Kolkata City, India

Mohanty, William K.; Verma, Akhilesh Kumar; Vaccari, Franco; Panza, G. F.

doi:10.1007/s12040-013-0275-1

Cited by 16 publications

(4 citation statements)

References 43 publications

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“…The area is characterized by many depressions in the form of marshes, shallow wetlands, and ox-bow lakes which are the remnants of the old river channels of Bhagirathi [18]. The deltaic plain is primarily covered by younger alluvial soils, mainly silty and clayey loams, which have been deposited by the rivers throughout the Quaternary [19]. At present, meagre amount of natural vegetation is found in the KMA as the continuous expansion of built-up and cultivated areas have replaced the natural vegetation covers.…”

Section: Delineation Of the Study Areamentioning

confidence: 99%

Long-term monitoring of cropland transformation in Kolkata Metropolitan Area, India using open-source geospatial technologies

Mazumder

Saha²,

Nandi

et al. 2021

SN Appl. Sci.

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Urban and peri-urban agricultural practices are degrading throughout the developing world owing to unprecedented urban sprawling and consequent expansion of built-up areas. This study attempted to assess the changing land use/land cover patterns of Kolkata Metropolitan Area, India from 1990 to 2020 with special emphasis on the transformation trajectories of its urban and peri-urban agriculture as a case study using free and open-source software and multi-temporal geospatial database. It also aimed to project the transformation scenario of croplands in 2030 through application of the artificial neural network algorithm of the freely available Modules for Land Use Change Evaluation plugin. Results revealed a persistent spread of built-up areas by engulfing croplands, wetlands, vegetation and water bodies throughout the assessment period. An overall loss of 181.11 sq. km of croplands between 1990 and 2020 was estimated and found to be more prominent in the northern, eastern, and south-eastern parts of the study area. If the existing socio-economic framework and administrative mechanism would prevail as usual, then the projected land use patterns of 2030 would predict a further decrease of 15.46 sq. km in cropland area thereby culminating to a total 37.39% of it original extent since 1990. A theoretical three-stage model of land use conversion was developed from the empirical results as well as field observations and validated with the findings of the projected scenario. It indicated two primary conversion patterns for the study area, viz. (1) natural area to cropland to fallow land and then to built-up, and (2) natural area to fallow land to built-up. Few necessary management measures were suggested to mitigate this persistent loss of croplands and other natural areas.

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Section: Delineation Of the Study Areamentioning

confidence: 99%

Long-term monitoring of cropland transformation in Kolkata Metropolitan Area, India using open-source geospatial technologies

Mazumder

Saha²,

Nandi

et al. 2021

SN Appl. Sci.

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“…The hybrid method has demonstrated its validity as a tool to perform the seismic microzonation of urban areas (e.g. Panza et al, 2002;Alvarez et al, 2005;Harbi et al, 2007;Zuccolo et al, 2008;Amponsah et al, 2009;Mohanty et al, 2013). Given its widespread application, quite some resources have been dedicated to the development of helper applications that permit an easy and nearly error-proof construction of the finite difference mesh.…”

Section: Laterally Heterogeneous Structural Modelsmentioning

confidence: 99%

A Web Application Prototype for the Multiscale Modelling of Seismic Input

Vaccari

2015

Earthquakes and Their Impact on Society

Self Cite

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A web application prototype is described, aimed at the generation of synthetic seismograms for user-defined earthquake models. The web application graphical user interface hides the complexity of the underlying computational engine, which is the outcome of the continuous evolution of sophisticated computer codes, some of which saw the light back in the middle '80s. With the web application, even the non-experts can produce ground shaking scenarios at the local or regional scale in very short times, depending on the complexity of the adopted source and medium models, without the need of a deep knowledge of the physics of the earthquake phenomenon. Actually, it may even allow neophytes to get some basic education in the field of seismology and seismic engineering, due to the simplified intuitive experimental approach to the matter. One of the most powerful features made available to the users is indeed the capability of executing quick parametric tests in near real-time, to explore the relations between each model's parameter and the resulting ground motion scenario. The synthetic seismograms generated through the web application can be used by civil engineers for the design of new seismo-resistant structures, or to analyse the performance of the existing ones under seismic load. R m=1 ∞ ∑ 3

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“…The epicentral distance has significant effect on local seismic response for Kolkata city (Mohanty et al, 2013), based on which demand envelope is necessary for hazard estimation. This enables a structural engineer to understand the appropriate demand that needs to be taken for design of a building in zones with amplification levels.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Regional Demand Parameters for Design of Mid-high-rise Building Using Past Earthquake Records

Raisinghani¹

2022

ASPS Conf. Proc.

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Category of earthquake and distance from epicenter are the prime parameters that decide the demand on buildings for its engineering. As observed in past Bhuj earthquake of 2001 (7Mw), seventy buildings got severely damaged in Ahmedabad city which is located 250kms from the epicenter. Intensity index through observed damages fills the gap for the demand anticipations. Design of a building considering excitation frequency rather than just the zone factor is necessary to include effects of low frequency waves (e.g. Mexico-city). This paper shows the broad ways in which seismic demand can be obtained for performing PBD in Indian context. A mid-rise RC building is designed as per three standard code of practices (i.e. IS, ACI, EN) to provide seismic resistance. The anticipated demand levels are obtained using GMPEs (PEER), magnitude-intensity relations, micro-zonation study and NDMA hazard contours for 15 storey building in Ahmedabad. The highest capacity curve is for design using IS 1893 code and this building will survive earthquake having 0.22g PGA value. The magnitude-intensity-epicentral distance relation (Gutenberg et al, 1956) shows that the intensity of VII for Zone-III is not correct for Ahmedabad city and it shall be taken as VIII which is for Zone-IV (0.24g) as per zoning map of India. However, as per the micro-zonation study showing PGA of 0.18g for the city it can be said that building will survive the next earthquake of 7.0Mw in Bhuj. The damage to non-structural elements is evident from the NLTHA using matched response spectrum obtained using Uttarkashi and Chamoli earthquake records (COSMOS). It is suggested to use intensity-based response spectrum for design of mid-high-rise buildings in Ahmedabad city. Moreover, a local directive based on social and technology resilience shall be developed to provide design basis based on loss (%)-multiple hazard (PGA) matrix using the matching relations found in this paper. Design provisions and loss reduction strategy can only lead to sustainable infrastructure in cities planning for vertical development.

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Influence of epicentral distance on local seismic response in Kolkata City, India

Cited by 16 publications

References 43 publications

Long-term monitoring of cropland transformation in Kolkata Metropolitan Area, India using open-source geospatial technologies

Long-term monitoring of cropland transformation in Kolkata Metropolitan Area, India using open-source geospatial technologies

A Web Application Prototype for the Multiscale Modelling of Seismic Input

Evaluation of Regional Demand Parameters for Design of Mid-high-rise Building Using Past Earthquake Records

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