Determination of Seismic Lineaments by EGM2008 Data and Gravitional Facies in North of Qazvin

This research is based on revealing hidden seismic lineaments by interpreting airborne gravimetric and magnetic gradients along with structural patterns (Berberian et al., 1999) in north of Qazvin. IIEES Earthquake catalogue (M>2 since 1962) has been plotted and analyzed for integrative geophysical purposes. Our research showed that hidden lineaments not only coincide with structural pattern, but spatially control the seismic behaviors in North Qazvin Fault (NQF) branches. The surveyed area is achieved by 56432 points with isometric grids. Besides, geological evidences have been used for facies changing and fault map verification according to seismic events. The facies’ change is an innovative process for evaluating gravity lineaments related to NQF hidden lineaments. Such a pattern provides the spatial association of NQF seismic patterns with the revealed seismogenic lineaments of which evidences can be proved by airborne geophysical dataset. As a result, at least two hidden lineaments can be distinguishable in north and eastern part of NQF according to geophysical evidences. Therefore the east and north east of Qazvin have more seismic potentials than other regions because an observed and meaningful variation of gravimetric facies next to NQF.

Geophysics, Gravity Facies; Hidden Lineaments; North Qazvin Fault