Geomorphic observations from southwestern terminus of Palghat Gap, south India and their tectonic implications

Singh, Yogendra; John, Beena Mary; Ganapathy, G.P.; George, Abhilash; Harisanth, S; Divyalakshmi, K. S.; Kesavan, Sreekumari

doi:10.1007/s12040-016-0695-9

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…Some of the fault related geological studies in Peninsular India (Wadakkancheri, Periyar and Thenmala faults) identified that the region is responding to compressive tectonic regime [22,25,26]. The slickensides from these faults indicate the recent movements are consistent with the present tectonic stress regime.…”

Section: Vithe Regional Stress Conditionsmentioning

confidence: 98%

“…Drainage system of the area is also controlled by the NW-SE trending lineaments corresponding to Periyar lineament that enters into Palghat-Cauvery shear zone. Singh et al, [25] identified that the continuity of this fault as segmented lineaments in the northwestern end and have induced drainage anomalies in the area. Their studies identified subtle landform modifications induced by ongoing tectonic adjustments in the area.…”

Section: Ivobservation On Neotectonism In Palghat-cauvey Shear Zonementioning

confidence: 99%

“…1988 Idukki M=4.5 earthquake). Signature of the NW-SE trending lineament is traced as faults at several locations along its trace [25].…”

Section: Ivobservation On Neotectonism In Palghat-cauvey Shear Zonementioning

confidence: 99%

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Seismicity of Kerala: An update

John¹,

Rajan²,

Subrahmanyam³

et al. 2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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The earthquake catalogue of the Kerala State indicates that the central part of the state (Wadakkancheri-Trissur and Idukki-Kottayam-Pala) is witnessing repeated seismicity. Though lineaments of all directions are identified in Kerala, some NW-SE trending structures are identified as neotectonically active and some of these NW-SE trending structures are even the source of recent seismicity. Some of the fault related geological studies in Peninsular India (Wadakkancheri, Periyar and Thenmala faults) identified that the region is responding to compressive tectonic regime. The slickensides from these faults indicate the recent movements are consistent with the present tectonic stress regime. Though the geological observations and seismological data indicate northeast directed stress regime, the in-situ stress measurement carried out at northern side of the study area shows local perturbation in maximum horizontal stress. Analysis of available seismic data of the region suggest that the seismic source at Idukki-Pala is indicating some recurrence pattern for moderate earthquakes and are spatially located close to the southeastern end of Periyar fault. The seismicity in the Wadakkancheri-Trissur, on the other hand, falls in the northwestern end of Periyar fault. It is also to be noted that the earthquakes in central Kerala were occurring as doublets. Thus, the estimation of earthquake potential of these regions through a proper integration of different disciplines and techniques is the need of the hour.

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Section: Vithe Regional Stress Conditionsmentioning

confidence: 98%

Section: Ivobservation On Neotectonism In Palghat-cauvey Shear Zonementioning

confidence: 99%

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Seismicity of Kerala: An update

John¹,

Rajan²,

Subrahmanyam³

et al. 2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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“…A comparative study of the morphometric parameters with seismic activity showed that the tectonic tilt, high deformation activity produces folded structures which are responsible for earthquakes and seismotectonic activity in the Jia Bhareli river catchment in the eastern Himalaya (Duarah and Phukan 2011). A study of the geomorphic observations and their tectonic implications reveals that the anomalies in the morphometric parameters correspond to lineaments, faults and micro seismic activities of the Palghat gap in south India (Singh et al 2016). Bhattacharya et al (2013) investigated the morphometric evidences of seismic activity in the Wagad and Gedi faults, Eastern Kachchh, Gujarat by analysing various morphometric parameters which reveal that the asymmetric nature of basin and stream migration suggests lateral displacements of faults, tectonic instability and seismic activity.…”

Section: Introductionmentioning

confidence: 99%

“…It is formed due to the displacements of structural features and deformation of rock masses (Kuk et al 2000). The analysis of drainage morphometric parameters and identification of geomorphic anomaly are key to seismotectonic studies (John and Rajendran 2008;Singh et al 2016). Silva et al (2003) studied the geomorphic indices for the assessment of tectonic and seismic activities in Spain which showed that the variation of geomorphic anomalies such as upliftment, discrete surface rupture, etc., determine the active tectonic process and seismic activity.…”

Section: Introductionmentioning

confidence: 99%

An assessment of geomorphometric anomalies and their significance on the seismotectonic activity through geoinformatics

Ghosh

Sivakumar

2019

J Earth Syst Sci

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The natural system of the drainage basin is interrupted by sub-surface faults and active tectonic processes. The anomalous nature of the drainage network and its basic morphological characteristics produce significant geomorphometric anomalies of the drainage basins which are an indicator of seismotectonic activity. In recent years, the increasing frequency of earthquakes and the subsequent damage in the Indian sub-continent necessitates a study of the seismotectonic significance with special reference to morphometric analysis. Hence, the present research is focused on studying the geomorphometric anomalies at a micro basin level and their impact on seismotectonic activity using geoinformatics. The study area is the lower Tista sub-basin which belongs to the Himalayan mountain in the northern part, whereas the southern part represents a peneplain surface. The quantitative databases of various morphometric parameters have been generated using digital elevation model data and satellite images to identify the geomorphic anomalies at the micro basin level which have been compared with past seismological databases to understand the impact on seismotectonic activity. The result shows that the drainage bifurcation, anomalous drainage network, drainage compression along the mountain front, narrow steep valleys in the high resistance surface, neotectonic deformation and the asymmetric valley shape are probable geomorphometric anomalies which coincide with past seismic activity in the study region. The present study also shows that the tectonic tilt, compressed meanders in the uplifted surface and the linear valley in the alluvial surface are also equivalently significant for past earthquake occurrences in the foothill zone. It is also observed that the elongated and linear micro basins and the presence of a strike-slip fault with major lineaments in the Quaternary surface are great indicators of geomorphometric anomalies which have no resemblance with any significant earthquake in the past and are equally important signatures of seismotectonic activity. The study concludes that the geomorphometric anomaly is an important parameter of seismotectonic activity which can be used for studying seismic hazards in the future.

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