Abstract
Landslide inventory mapping studies around Mersin and Erdemli regions of southern Turkey revealed that numerous old large-scale and recent small-scale landslides were presumably aroused in different time intervals. While the recent active landslides have been mostly triggered by excessive rainfall, old landslides are considered to be occurred by geomorphologic valley incision processes besides the other preparatory environmental conditions. The evaluation of the spatial distribution of old landslides present retrogressive, deep-seated with complex and rotational slides in the ophiolites and ophiolitic melange units comprising also overlying reefal limestones. In this study, surface deformations caused by landslides were evaluated using radar interferometry techniques for a specified period in Karaoglan catchment. Landslide related deformations were detected over radar images of L-band ALOS-PALSAR sensor for the years between 2007 and 2011. Landslides which are active are investigated in detail cross-sections. The mean displacement from differential interferogram cross-sections was measured 3.5 cm in LOS direction. Differential SAR interferometry for studied period depicts that the average rate of movement for the entire area is extremely slow with a rate of 10 mm/yr.
Highlights
Landslides are among the most important and common geomorphic processes that produce systematic changes in the development and evolution of landforms
It is clear that InSAR techniques are making significant addition in monitoring seasonal slope activity at high-risk sites (Singhroy 2008)
The obta ined displa cement ra tes genera lly coincide with the landslides located especially on the slopes with dip directions towards SW
Summary
Landslides are among the most important and common geomorphic processes that produce systematic changes in the development and evolution of landforms. I.e. flow, fall, topple, slide, produces a distinct morphological imprint on the landform under similar geoenvironmental conditions (Cruden and Varnes 1996). Landslide inventories and their spatial and temporal variations in conjunction with the preparatory and triggering factors are essential for the landslide susceptibility and haza rd assessments. The greater ava ilability and improved capability of radar sensors and the development of more advanced data processing techniques increasingly enabled the use of SAR data in ground deformations (Massonnet and Feigl 1998; Rosen et al 2000; Metternicht et al 2005; Catani et al 2005; Colesanti and Wasowski 2006; Rott a n d Na gler 2006; Zhou et a l. 2009; Ha sta oğlu et a l. 2018)
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