A qualitative assessment of seismic risk along the Peninsular coast of India, south of 19°N

Banerjee, P. K.; Vaz, G. Gaitan; Sengupta, B.; Bagchi, Ashutosh

doi:10.1016/s0264-3707(01)00030-8

Cited by 9 publications

(5 citation statements)

References 41 publications

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“…The recurrences of a minor–major earthquakes (Banerjee et al, ; Roy, ; Biswas, ) preferentially concentrated along the basement faults (Figure c) also support this assertion. The earthquakes have been found to be associated with the displacement of river channel, incised valley, coastal and fluvial terraces, and so forth.…”

Section: Discussionmentioning

confidence: 77%

“…The earthquakes have been found to be associated with the displacement of river channel, incised valley, coastal and fluvial terraces, and so forth. (Subrahmanya, ; Rajendran, ; Banerjee et al, ; Murthy, ; Ramkumar et al, ). Roy () in an independent study confirmed the assertion that the older geodynamics, basement faults, and rifts of Gondwanaland causes the neo‐seismic events.…”

Section: Discussionmentioning

confidence: 99%

“…The earthquakes have been found to be associated with the displacement of river channel, incised valley, coastal and fluvial terraces, and so forth. (Subrahmanya, 1996;Rajendran, 2000;Banerjee et al, 2001;Murthy, 2002;Ramkumar et al, 2016). Roy (2004) Figure 11b) shows sinuosity values of <1.32 (Table 3), and the Thamirabarani Basin that has 41 fifth-order sub-basins shows sinuosity values of <1.4 (Table 4), suggesting low sinuosity and thus tectonically highly active nature.…”

Section: Relationships Between Geomorphometric Parameters and Implimentioning

confidence: 99%

“…Previous studies focused on the structural (Gombos, Powell, & Norton, ) and geomorphic evolution of the Western Continental Margin (WCM) and Western Ghats Escarpment (WGE) (Gunnel et al, ), respectively. Extensive studies have been carried out on the tectonic (Acharyya & Lahiri, ; Balakrishnan, ; Banerjee, Vaz, Sengupta, & Bagchi, ; Biswas, ; Banerjee, Bürgmann, Nagarajan, & Apel, ; Lal, Siawal, & Kaul, ; Dev, Radhakrishna, Chand, & Subrahmanyam, ; Ramkumar et al, ), geomorphic (Reddy & Shah, ; Agarwal, Dotiwala, Mitra, & Bhoj, ; Nair, ; Allison, Khan, Goodbred, & Kuehl, ; Avinash, Deepika, & Jayappa, ; Ramkumar et al, ), and basin evolution (Banerji, ; Mathur & Nair, ; Chari, Sahu, Banerjee, Zutshi, & Chandra, ; Radhakrishna, Chand, & Subrahmanyam, ; Jayalakshmi, Nair, Kumai, & Santosh, ) histories of the Indian sedimentary and river basins, coastal deltas, and offshore regions. Although these studies applied a variety of tools (e.g., Bhatt & Bhonde, ; Campanile, Nambiar, Bishop, Widdowson, & Brown, ; Karisiddaiah, Veerayya, & Vora, ; Kale & Vaidyanadhan, ; Kunte & Wagle, ; Ramkumar, ; Ramkumar, ; Ramkumar, Pattabhi Ramayya, & Gandhi, ; Ramkumar, ; Ramkumar et al, , ; Ramkumar, ; Ramkumar et al, , ; Sensarma, Rajamani, & Tripathi, ; Singh, Parkash, & Singhvi, ; Sinha & Tandon, ), there has not yet been a systematic synthesis to understand the landscape evolution at a regional scale.…”

Section: Introductionmentioning

confidence: 99%

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Tectono‐morphological evolution of the Cauvery, Vaigai, and Thamirabarani River basins: Implications on timing, stratigraphic markers, relative roles of intrinsic and extrinsic factors, and transience of Southern Indian landscape

et al. 2019

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Peninsular India is an amalgam of transient landscapes evolved from the interactions between tectonic and climatic forcings. In order to appraise the tectono‐geomorphic evolution of South India, it is essential to understand the relationships between intrinsic and extrinsic processes and their geomorphic expressions at a river basin scale. Seven geomorphometric parameters, namely, longitudinal profile (Lp), asymmetry factor (Af), hypsometric curve and hypsometric integral (HI), mountain front sinuosity (Smf), river sinuosity (R), stream length gradient (Sl), and shape factor (Shp) were calculated for selected drainage basins of South India. Spatial analyses of these parameters in the light of systematic field mapping were attempted in this study. The results show the occurrences of southern sub‐basins with convex hypsometric curves indicating a youth stage and significant tectonic influence. The low and moderate Smf values within the basins are indicative of mountain fronts witnessing a high level of tectonic activity. The net effects of tectonic and geomorphometric processes are inferred to have been the responses of anti‐clockwise rotation of the Indian Plate and ridge uplift‐push from west. Directional change in Thamirabarani River Basin and drainage channel reorganizations in the Cauvery and Vaigai River basins stand testimony to these, among others. Amidst these, occurrences of tectonically quiescent regions and multiple incisions by river channels and flow of modern river channels in inherited palaeovalleys but on tangent directions of ancient flows are also observed. Five stages of landscape development are envisaged: First, inheritance of river basins from palaeodrainage systems; second, reversal of river flow directions during early part of Cenozoic and inception of evolution of modern river systems; third, during Miocene–Pliocene; fourth, during Pleistocene–Early Holocene; and fifth, during the Holocene–Anthropocene. The recent resurgence of tectonics is not only reflected in the shifting of axial rivers, but is also evidenced by seismicity and landslides/faulting. Together, transient nature of the Southern Indian Plate, first‐order control of tectonics, followed by climate and lithology over landscape evolution, inheritance of river valleys, synonymy of river basin responses to intrinsic and extrinsic geomorphic processes, however with unique signatures and basin‐scale responses, are inferred. Detailed morphometric studies and supplementation with precise age data may fine‐tune the proposed model. According to the model, inheritance of Mesozoic valley/structures during Late Jurassic–Early Cretaceous, drainage reversal and initiation of Cenozoic–Recent river basin evolution, intense peneplanation during Miocene–Pliocene, intense incision during Pleistocene, periodic climatic extremes during Early Cenozoic, Palaeocene–Eocene, Oligocene and corresponding pedogenesis, and terrace formation and sedimentation have been recognized. Based on the numerical ages and documentation of basin‐scale distribution of s...

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Relationships Between Geomorphometric Parameters and Implimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tectono‐morphological evolution of the Cauvery, Vaigai, and Thamirabarani River basins: Implications on timing, stratigraphic markers, relative roles of intrinsic and extrinsic factors, and transience of Southern Indian landscape

et al. 2019

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“…However, some of the earthquakes that occurred in this Stable Continental Region (SCR) are quite devastating, for example the Latur (1993; Mw 6.3), Jabalpur (1997; Mw 6.0) and Bhuj (2001; Mw 7.7) events (Mandal et al 2000). New data has been added during the last two decades to understand the process of crustal deformation and fault reactivation taking place in the South Indian Shield (Ramasamy 1989;Banerjee et al 2001;Rajaram and Anand 2003;Vita-Finzi 2004). Subrahmanya (1996) reported active intraplate deformation along a W-E axis following the 130 N from Mulki on the west coast to Pulicat on the east.…”

Section: Recent Seismicity Within the South Indian (Peninsular) Shieldmentioning

confidence: 99%

Land–ocean tectonics (LOTs) and the associated seismic hazard over the Eastern Continental Margin of India (ECMI)

Murthy

Subrahmanyam

et al. 2010

Nat Hazards

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The South Indian (Peninsular) Shield which includes both the Eastern and Western Continental Margins of India is not as stable as it was originally thought of. The importance of intraplate seismicity within this Shield has recently been realized with some devastating earthquakes that occurred during the last few decades. It is also significant to note that most of the Precambrian tectonic lineaments in this Shield are oriented in either a NW-SE or W-E direction, joining the eastern offshore. In contrast, the western margin has an elevated coast, associated with a linear coast parallel escarpment, particularly on the southern side, superimposed by Deccan Trap volcanics on the northern side. The fault reactivation and the associated seismicity are hence more predominant on the east coast. Recent geophysical studies delineated land-ocean tectonics (LOTs) over the eastern margin, in some cases associated with moderate seismicity as a result of the compressional stress acting on the Indian Plate. Though the Eastern Continental Margin of India (ECMI) is considered as a passive margin, coastal seismicity due to the reactivation of the pre-existing tectonic lineaments extending offshore represents a potential natural hazard. In this context, the ECMI appears to be much more vulnerable compared to its counterpart on the west.

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Geological Setup of the East Coast of India

Saha

2021

Estuarine Biogeochemical Dynamics of the East Coast of India

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A qualitative assessment of seismic risk along the Peninsular coast of India, south of 19°N

Cited by 9 publications

References 41 publications

Tectono‐morphological evolution of the Cauvery, Vaigai, and Thamirabarani River basins: Implications on timing, stratigraphic markers, relative roles of intrinsic and extrinsic factors, and transience of Southern Indian landscape

Tectono‐morphological evolution of the Cauvery, Vaigai, and Thamirabarani River basins: Implications on timing, stratigraphic markers, relative roles of intrinsic and extrinsic factors, and transience of Southern Indian landscape

Land–ocean tectonics (LOTs) and the associated seismic hazard over the Eastern Continental Margin of India (ECMI)

Geological Setup of the East Coast of India

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