A seismic hazard map of India and adjacent areas

Khattri, K. N.; Rogers, A.M.; Perkins, David M.; Algermissen, S.T.

doi:10.1016/0040-1951(84)90156-2

Cited by 156 publications

(89 citation statements)

References 16 publications

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“…The intensity-based mapping of Indian Subcontinent was presented by Guha (1962) and Gubin (1968). The probabilistic seismic hazard studies for this area was done by several researchers including Basu and Nigam (1977), Kaila and Rao (1979), Khatri et al (1984) and Sinha (2006, 2007). Even though researchers like Reddy (2003), Purnachandra Rao (1999), Gangrade and Arora (2000), etc.…”

Section: Study Areamentioning

confidence: 99%

Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach

Vipin

Anbazhagan

Sitharam

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. In this work an attempt has been made to evaluate the seismic hazard of South India (8.0 • N-20 • N; 72 • E-88 • E) based on the probabilistic seismic hazard analysis (PSHA). The earthquake data obtained from different sources were declustered to remove the dependent events. A total of 598 earthquakes of moment magnitude 4 and above were obtained from the study area after declustering, and were considered for further hazard analysis. The seismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones in the study area which are associated with earthquakes of magnitude 4 and above. For assessing the seismic hazard, the study area was divided into small grids of size 0.1 • ×0.1 • , and the hazard parameters were calculated at the centre of each of these grid cells by considering all the seismic sources with in a radius of 300 km. Rock level peak horizontal acceleration (PHA) and spectral acceleration (SA) values at 1 s corresponding to 10% and 2% probability of exceedance in 50 years have been calculated for all the grid points. The contour maps showing the spatial variation of these values are presented here. Uniform hazard response spectrum (UHRS) at rock level for 5% damping and 10% and 2% probability of exceedance in 50 years were also developed for all the grid points. The peak ground acceleration (PGA) at surface level was calculated for the entire South India for four different site classes. These values can be used to find the PGA values at any site in South India based on site class at that location. Thus, this method can be viewed as a simplified method to evaluate the PGA values at any site in the study area.

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Section: Study Areamentioning

confidence: 99%

Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach

Vipin

Anbazhagan

Sitharam

2009

Nat. Hazards Earth Syst. Sci.

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“…2(b). Surface heatflow values and epicenters of seismic disturbance over the I-CL also show a concentration of seismic deformation and higher heatflow in the MBs (modified from Khattri et al, 1987;Ravishanker, 1988;Gupta et al, 1989).…”

Section: Geophysical and Tectonic Evidence Of Channelingmentioning

confidence: 99%

Chipping of cratons and breakup along mobile belts of a supercontinent

Veeraswamy

Raval

2014

Earth Planet Sp

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Probably one of the most significant heterogeneities of a continental lithosphere is the noticeable difference in the thickness and properties of its cratonic and mobile parts. The trans-continental mobile belts (Paleoorogens/paleo-sutures) represent a relatively thinner, warm, wet and weak lithosphere, which makes it more vulnerable to episodic mantle (or plume) upwellings and compressional forces. Here evidence is presented from the Indian continental lithosphere to show that these properties of mobile belts (MB) facilitate channeling of thermomagmatic fluxes (TMF) in both lateral as well as vertical directions. This, to a major extent, can account for the observed concentration (or focusing) of geophysical anomalies, tectonomagmatic features and strain along these MBs. In addition, a closer examination of the three continental breakups of Greater India since the Cretaceous reveals that the combination of a sufficiently weakened MB and mantle plume could become 'fatal' for the supercontinental stability. On the other hand, the thick (>200 km) or deep-rooted continental lithosphere beneath cratons is characterized by a relatively cold and dry lithosphere, which resists remobilization. From this relative impenetrability, TMFs are channeled mostly through the MBs following the long-term stability of the cratonic lithosphere. This difference in cratonic and MB regimes results in strongly heterogeneous thermal blanketing. However, in certain situations, the edge of a cratonic region may also get chipped-off following a number of thermotectonic rejuvenations of adjoining MBs-as exemplified by the breakup of the Antongil and Masora cratonic blocks (now lying on the Madagascar) from the Western Dharwar craton (India) during the IndiaMadagascar separation. From the study of supercontinental dispersals, it seems that the processes of breakup along pre-existing mobile belts may be globally applicable. This is, at times, also accompanied by chipping of cratons.

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“…Ground accelerations of 0.1 are considered capable of causing damage. Khattri [8] prepared a probabilistic seismic hazard map for India and adjacent areas that depicted contours of peak accelerations in rock in percent g with a 10% probability of exceedance in 50 years. II VI III VII IV VIII V I X o r m o r e In 1997, the Ministry of Urban Development of the Government of India published the first Vulnerability Atlas of India [9].…”

Section: India Seismic Hazard Mapsmentioning

confidence: 99%