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Steep slope, steep dips of the lithotypes, presence of clay layering in weathered rock types, eve... more Steep slope, steep dips of the lithotypes, presence of clay layering in weathered rock types, events of continuous heavy rains, flooding on the slopes and improper land use practices play a major role in the genesis of landslides in the Nilgiris. Recent enhancement in the events of the landslides in the Nilgiris is mainly due to ongoing Seismotectonic activities in Southern Granulite Terrain (SGT) of South India and reactivation of hidden blind shear zones of Nilgiri Hills. Mitigation measures are highlighted.
Multi Pan-African shearing along NW-SE to WNW-ESE Achankoil-Tambraparni shear (ATS) Zone and its ... more Multi Pan-African shearing along NW-SE to WNW-ESE Achankoil-Tambraparni shear (ATS) Zone and its contiguous and parallel Tenmalai-Gatana shear (TGS) of South India and their associated shear features are reported. The 550 Ma sinistral brittle ATS is found to overprint on the earlier 670 Ma dextral ductile dominant TGS zone. Associated shear features and zones of imbrications indicate the TGS is a dextral slip dominant, oblique fault whereas the ATS is a sinistral slip dominant, oblique fault resulted in west or northwesterly thrusting of Khondalites and its assemblage. Shear lineaments suggest that the area has suffered fourfold deformations viz., D1, D2, D3 and D4. An early weak and later two strong generations of cordierite formation coincide with D1, D2, D3 and two generation of incipient and massive charnockites and granites occur at D2 (670 Ma) and D3 (550 Ma).Introduction The Southern Granulite Terrain (SGT) of South India is dissected by prominent shear zones and deep crustal...
Remote sensing and field studies of Ambasamudram – Tenkasi transect a part of Achankovil-Tambrapa... more Remote sensing and field studies of Ambasamudram – Tenkasi transect a part of Achankovil-Tambraparni Shear Zone of south India reveal five different pattern of lineaments i.e. (i) ENE –WSW to E – W (ii) NNW – SSE to NW – SE (iii) NNE – SSW to NE –SW (iv) NW – SE to WNW – ESE and (v) N – S. Based on shear sense and field association nine prominent shear-lineaments related to D1, D2, D3 and D4 deformation have been delineated. Mean frequency, mean density and nearest neighbor analysis of shear-lineaments form a tool to distinguish the intensity of deformation and to predict the order of decreasing intensity of deformation i.e. D3, D2, D4 and D1. The random and regular patterns of individual shear-lineaments were observed and their restriction to a specific lithology and geomorphic expression are pointing towards a genetic link between them.
Steep slope, steep dips of the lithotypes, presence of clay layering in weathered rock types, eve... more Steep slope, steep dips of the lithotypes, presence of clay layering in weathered rock types, events of continuous heavy rains, flooding on the slopes and improper land use practices play a major role in the genesis of landslides in the Nilgiris. Recent enhancement in the events of the landslides in the Nilgiris is mainly due to ongoing Seismotectonic activities in Southern Granulite Terrain (SGT) of South India and reactivation of hidden blind shear zones of Nilgiri Hills. Mitigation measures are highlighted.
Multi Pan-African shearing along NW-SE to WNW-ESE Achankoil-Tambraparni shear (ATS) Zone and its ... more Multi Pan-African shearing along NW-SE to WNW-ESE Achankoil-Tambraparni shear (ATS) Zone and its contiguous and parallel Tenmalai-Gatana shear (TGS) of South India and their associated shear features are reported. The 550 Ma sinistral brittle ATS is found to overprint on the earlier 670 Ma dextral ductile dominant TGS zone. Associated shear features and zones of imbrications indicate the TGS is a dextral slip dominant, oblique fault whereas the ATS is a sinistral slip dominant, oblique fault resulted in west or northwesterly thrusting of Khondalites and its assemblage. Shear lineaments suggest that the area has suffered fourfold deformations viz., D1, D2, D3 and D4. An early weak and later two strong generations of cordierite formation coincide with D1, D2, D3 and two generation of incipient and massive charnockites and granites occur at D2 (670 Ma) and D3 (550 Ma).Introduction The Southern Granulite Terrain (SGT) of South India is dissected by prominent shear zones and deep crustal...
Remote sensing and field studies of Ambasamudram – Tenkasi transect a part of Achankovil-Tambrapa... more Remote sensing and field studies of Ambasamudram – Tenkasi transect a part of Achankovil-Tambraparni Shear Zone of south India reveal five different pattern of lineaments i.e. (i) ENE –WSW to E – W (ii) NNW – SSE to NW – SE (iii) NNE – SSW to NE –SW (iv) NW – SE to WNW – ESE and (v) N – S. Based on shear sense and field association nine prominent shear-lineaments related to D1, D2, D3 and D4 deformation have been delineated. Mean frequency, mean density and nearest neighbor analysis of shear-lineaments form a tool to distinguish the intensity of deformation and to predict the order of decreasing intensity of deformation i.e. D3, D2, D4 and D1. The random and regular patterns of individual shear-lineaments were observed and their restriction to a specific lithology and geomorphic expression are pointing towards a genetic link between them.