چكيده لاتين :
Landsat TM data were used in the study ofneotectonics
of the Tabas region in eastern Iran to assess drainage pattern and
migration model ofrivers. Evaluation and inspection ofactive tectonic
processes and their effects such as earthquakes is ofgreat importance in earthquake hazard analysis in any area. Since most processes directly related to seismic risk are not expressed in ways measurablefrom ground or satellite observations, using morphotectonic indicators of active tectonics may be useful for identifying these events. In this paper, the focus lies on the changes in the drainage network and the migration of rivers to get a clear understanding of active tectonics in the area.
The relief in the area is remarkable due to its sharp contrasts and the
multitude and variability of the morphological elements. Various
geomorphic features supporting recent tectonic movements were
decipheredfrom the various remotely sensed data. These include: strikeslip faults, fault line scarps, triangular facets, uphill facing scarps,
pressure-ridges, and abrupt changes in topographic slope angles along
fault traces, offset drainage, truncated fans and beheaded drainage
channels. Subsequently the focus of active deformation seems to have
shifted northwest, and more precisely in an anti-clockwise direction, to
where the most active zone ofdeformation is now buried in the desert
of the Tabas plain.
