Science Service System

Summary of Proposal GEO3086

TitleDelineation and characterization of faults in Eastern Himalaya foreland fans usingTerraSAR-X data
Investigator Ekka, Amar Bishram - Geological Survey of India, Photogeology and Remote Sensing
Team Member
Mr. Pramanik, Kaushik - Geological Survey of India, Photogeology and Remote Sensing
SummaryIdentification and delineation of active fault segments and their characterization has been one of the thrust areas of geological investigation and has been a major study input for seismic hazards assessment. During National Geomorphological and Lineament Mapping programme, lineaments were delineated based on IRS LISS III multispectral data on 1:50,000 scale. But characterization of those lineaments based on geomorphic forms and elements could not be achieved. Microwave remote sensing data plays an important role in interpreting the lineaments in a better way. Synthetic aperture radar interferometry (InSAR) is an imaging technique providing maps of the topography and displacement of the Earth’s surface. Since the advent of space borne radar instruments (essentially the European Space Agency Earth Remote Sensing Satellites (ERS), the Japanese JERS-1, the Canadian RADARSAT, and the US Shuttle radar missions), InSAR has been used to study a variety of geophysical phenomena including earthquakes, volcanic activity, ground subsidence, landslides, and glacier ?ow. ERS1/2 radar data acquired before and after any event provide geodetic measurements of two components of the co-seismic surface displacement ?eld: (1) Interferometric processing of the data provides information on displacement with a precision of a few millimeters (2) Sub-pixel correlation of the before and after amplitude images provides a second component of the surface displacement ?eld, parallel to the satellite track, with a precision of~20 cm. Mapping of fault zone that has been activated during the Quaternary period is important for neotectonic studies. Identification and characterization of active faults are considered to be a major study input for seismic hazard assessment considering its immense societal relevance. Neotectonic structures have been reported since 1971 from the Quaternary fan deposits of North Bengal from different geomorphological evidences. B. Sural and A. Das (1991-95) carried out neotectonic evaluation of Eastern Himalayan foredeep area in North Bengal and identified several lineaments parallel to the Himalayan-orogenic trend, and also some transverse lineament extending from high Himalayas to the piedmont alluvial fan deposit. Prof. Nakata of Hirosima University, Japan (2000) made substantial studies using airborne remote sensing data aided by ground truth along one of the major NW-SE strike-slip fault in Eastern Nepal

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