Mapping of tectonic lineaments and analysis of earthquake occurrences in Kutchh region...

Mapping of tectonic lineaments and analysis of earthquake occurrences in Kutchh region of Indian subcontinent using GIS and Remote Sensing techniques

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Abstract

Mapping of tectonic lineaments and analysis of earthquake occurrences in Kutchh region of Indian subcontinent using GIS and Remote Sensing techniques

Dr. V. K. Srivastava, Ranjana Ghosh
Dept. of Applied Geophysics
Indian School of Mines – 826004, Dhanbad
Email: [email protected]

Abstract

Earthquakes of shallow nature are manifestation of active tectonic lineaments . Therefore lineaments on remote sensing images which provide an integrated view of geofabric of a region and analysis of associated earthquake occurrence in space and time in aregion through GIS provides a better understanding of seismo- tectonics of the region. With this view the present paper discusses the mapping of lineaments on IRS WiFS imagery and integrated study of spatial pattern of earthquake occurrence since 1819 along with regional gravity set up of the Kutch region in GIS environment, which has witnessed nearly 7 big earthquakes ( M>6) during the last 200 years. The region falls in the V seismic zone of the seismic zoning map of India. Further statistical analysis relating frequency and magnitude has been carried out to know the return period of damaging earthquakes. Also an intensity attenuations relationship has been obtained for calculating the associated seismic risk factor.

Integrated analysis of regional gravity trend map, lineament map and epicentral distribution map of Kutch region has shown that all the three major trends viz..; Kutchh, Cambay and Narmada rifts which are bounded by three important Precambrian tectonic trends: NNW-SSW Dharwar trend ,the NE-SW Delhi- Aravalli trend and the ENE-WSW Satpura trend are active.