An engineering model for seismicity of India

Jayalakshmi, S.; Raghukanth, S. T. G.

doi:10.1080/19475705.2013.815282

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…Recent numerical models of the Indian plate have been centred on 2D modelling (Cloetingh & Wortel, 1986;Coblentz et al, 1998;Dyksterhuis et al, 2005;Jayalakshmi & Raghukanth, 2015Manglik et al, 2008;Wiens et al, 1985), primarily elastic homogeneous models. Cloetingh and Wortel (1986) employed five tectonic forces in their model, i.e, ridge push, trench suction force, drag force, slab pull, and resistant force, and estimated a compressive force in the range of 300-500 MPa.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Intraplate Stress Distribution of the Indian Tectonic Plate Using the Finite Element Method

Bahuguna

Shanker

2021

Pure Appl. Geophys.

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The intraplate stress field distribution is estimated by considering the isotropic elastic properties of the Indian plate using numerical analysis. In most modelling, the intraplate stresses are typically established on applying plate-driving forces to a homogeneous elastic plate. However, a tectonic plate comprises continental and oceanic lithosphere with sedimentary basins, cratons, and fold belts with varying significant differences in elastic properties, which likely affect the magnitude and pattern of stress and deformation. In the present study, the finite element method (FEM)-based software packages ABAQUS is used to simulate the intraplate stress distribution in the plate using a 3D mechanical model incorporating the elastic properties of the 19 geological regions of the Indian subcontinent and oceanic region. FEM models are validated with Indian plate fixed GPS velocities and found to be in reasonable agreement with the plate's velocity. This study can augment the interpretability of seismic and geological studies. Also, the model can be helpful to perform seismic hazard assessment (using the stress estimated with the FEM model), identify the seismically active zones and collect insight on active intraplate deformation of seismically active regions of the Indian plate by interpreting the strain rate, deformation rate and stress distribution data.

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Section: Introductionmentioning

confidence: 99%

Simulation of Intraplate Stress Distribution of the Indian Tectonic Plate Using the Finite Element Method

Bahuguna

Shanker

2021

Pure Appl. Geophys.

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“…Later on, finite element models developed by previous authors (Coblentz et al 1995, Dyksterhuis et al 2005 explored the various plate driving forces on the Indo-Australian plate and the effect of cratons, basins and fold belts on the stress field in continental Australia. Jayalakshmi and Raghukanth (2015) developed an engineering model for Indian plate to broadly explain seismic activity in India from the known plate driving forces, earthquake catalogue and GPS measurements. However, this model is based on the short term behaviour of the plate with prior information on the location of faults and the epicenters of past earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Intra Plate Stresses Using Finite Element Modelling

Jayalakshmi

Raghukanth

2016

Acta Geophys.

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One of the most challenging problems in the estimation of seismic hazard is the ability to quantify seismic activity. Empirical models based on the available earthquake catalogue are often used to obtain activity of source regions. The major limitation with this approach is the lack of sufficient data near a specified source. The non-availability of data poses difficulties in obtaining distribution of earthquakes with large return periods. Such events recur over geological time scales during which tectonic processes, including mantle convection, formation of faults and new plate boundaries, are likely to take place. The availability of geometries of plate boundaries, plate driving forces, lithospheric stress field and GPS measurements has provided numerous insights on the mechanics of tectonic plates. In this article, a 2D finite element model of Indo-Australian plate is developed with the focus of representing seismic activity in India. The effect of large scale geological features including sedimentary basins, fold belts and cratons on the stress field in India is explored in this study. In order to address long term behaviour, the orientation of stress field and tectonic faults of the present Indo-Australian plate are compared with a reconstructed stress field from the early Miocene (20 Ma).

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