Functions of the tectonic forces and comparing them with the mechanism of the earthquakes in Qazvin zone,Abyek

Category Tectonic & Seismotectonic
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

   General:
     From geological evidence in Qazvin area, such as faults, historical earthquakes and late century recorded earthquakes have been appeared area is very active seismically. At fèrst, in this research, we try to extracted exist linearnenis from visual interpretations on Landsat 5 satellite images (TM) in various scales and then this lineaments have been controlled by arcal photographs with 1:55 000 scale that majority of them concentrated in mid zone of this plain; later this plain has been divided into 7 zones and provided Rose diagrams Ibr about 2000 joints. Diagram analysis represented that major stress is comprcsslional with N-S direction, that local mecanism of reported distructive earthqoukes of this area indicated them too.ln addition plain existing lineaments have controlled drainage patterns that in cases comp iciously can be seen active displacement of fliults suddenly dranages trend has been changed that indicat area is active seismically.

tags: QAZVIN