Earthquake-induced landslide monitoring and survey by means of InSAR

Abstract

Abstract. This study uses interferometric synthetic aperture radar (SAR) techniques to identify and track earthquake-induced landslides as well as lands prone to landslides, by detecting deformations in areas struck by earthquakes. The pilot study area investigates the Mila region in Algeria, which suffered significant landslides and structural damage (earthquake: Mw 5, 7 August 2020). DInSAR analysis shows normal interferograms with small fringes. The coherence change detection (CCD) and DInSAR analysis were able to identify many landslides and ground deformations also confirmed by Sentinel-2 optical images and field inspection. The most important displacement (2.5 m), located in the Kherba neighborhood, caused severe damage to dwellings. It is worth notice that CCD and DInSAR are very useful since they were also able to identify ground cracks surrounding a large zone (3.94 km2 area) in Grarem City, whereas the Sentinel-2 optical images could not detect them. Although displacement time-series analysis of 224 interferograms (April 2015 to September 2020) performed using LiCSBAS did not detect any pre-event geotechnical precursors, the post-event analysis shows a 110 mm yr−1 subsidence velocity in the back hillside of Kherba.

An Assessment of Earthquake-Induced Landslides Distribution in Nepal Using Open-Source Applications on Sentinel-1 Tops Sar Imagery

“…At the selected location, the greatest displacement rate measured was 35 mm/year along the radar line of sight direction. Moreover, Smail et al [30] used interferometric syn-thetic aperture radar technologies to locate and monitor earthquake-induced landslides as well as lands prone to landslides by locating deformations in earthquake-affected areas. The Mila region of Algeria, which experienced substantial landslides and structural damage, is the subject of the pilot study region.…”

Post-earthquake damage classification and assessment: case study of the residential buildings after the Mw = 5 earthquake in Mila city, Northeast Algeria on August 7, 2020

“…The current work consists of regional and local studies, mainly based on seismic vulnerability assessments by (Bechtoula and Ousalem 2005 ; Laouami et al 2006 ; Harbi et al 2007a , 2007b ; Belazougui 2008 ; Hellel et al 2010 ; Meslem et al 2012 ; Mehani et al 2013 ; Boukri et al 2013 ; Remki and Benouar 2014 ; Hamidatou et al 2017 ; Chimouni et al 2018 ; Allali et al 2018 ; Hichem et al 2019 ; Akkouche 2019 ; Amari et al 2020 ). We know that the first major hazard that threatens the Mila region is landslide, in this case several studies have assessed landslides’ risk as well as earthquake-triggered landslides’ risk in the region (Marmi et al 2008 ; Atmania et al 2010 ; Guemache et al 2010 ; Semmane et al 2012 ; Merghadi et al 2018 ; Benfedda et al 2021 ; Tebbouche et al 2022 ; Smail et al 2022 ; Bounemeur et al 2022 ; Medhat et al 2022 ).…”