Determination and Structural Analysis of the Lahijan Transverse Fault in Forestall Region of Alborz Mountains, Iran: A Geospatial Application

Abstract

The Lahijan fault zone (LFZ) is a transverse fault placed in a Forestall area of western Alborz Range, and cuts across this fold-thrust belt along the Sepid-rud valley. The results were later completed with field investigations. Analysis of the results of Geoinformatics Techniques (GiT) helped us to determine the limits and kinematics of the main fault zone and other related faults. The results showed that LFZ with N55E general strike, 90 km length and 30 km width extend from Sepid-rud dam to the Lahijan city. This fault zone, as a transversal fault, truncated and offset the western part of Alborz fold-thrust belt and thus, caused many structural complexities in this region. The results of structural investigations showed that LFZ was established as a leftlateral strike-slip fault zone. Several fault trends are generated by this tectonic regime.