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The term active tectonics refers to those processes that produce deformation of earth’s crust on a time scale of significance to human society. Earthquakes are the resultants of such deformations at the earth crust. The devastating events occurred in the past three decades (e. g 1993 Killari, 1997 Jabalpur and 2001 Bhuj) has changed the concept of stability of peninsular India. Due to the long reoccurrence interval of damaging earthquakes in Peninsular India, many of the active faults have not shown any seismic activity in the human memory. Since there exist a fast rate of erosion compared to tectonic movement, it becomes very difficult to identify such seismogenic feature. Thus the study of landforms, geomorphic indices and morphometric analysis will play a vital role in identification of subtle deformations associated with such seismogenic features. The study area covers the basins of Vaddakancheripuzha, Karuvannur river and their tributaries. The area has experienced an event of Mw 6.0 (Coimbtore, 1900) in the past. In the present also this area is experiencing micro seismic activity since 1989. In this study effort has been made to identify subtle deformations associated with active tectonic features using the remote sensing, geomorphic and morphometric analysis. Remote sensing study has identified the NW-SE, NE-SW, E-W and NNW-SSE trending lineaments in which the Periyar lineament is identified as three parallel NW-SE trending lineaments. Some other lineaments have also been identified, apparently branched from NW-SE trending Idamalayar lineament.. Valley floor Valley width ratio along the NW-SE trending drainage segments also shows relatively low values (0.32 to 10.0) in comparison to NE-SW trending drainage segments. Mountain front sinuosity also shows relatively high values along the NW-SE compare to NE-SW trending mountain fronts. In addition to that field studies have also identified NW-SE trending faults in the form of deformation around the areas where the anomalies in geomorphic analysis has been identified. Thus the present study has identified neotectonically induced geomorphological changes associated with the segments of NW-SE lineaments which can be a source for a future seismic event and also first step in the direction of seismic hazard assessment. Keywords—earthquake; geomorphic marker; drainages; lineaments; neotectonic

Geomorphic studies for identification of active fault: observations from smaller river basins, south India