“…) and higher values in landslide bedrock (Bichler et al, 2004;Jongmans et al, 2009;Uhlemann et al, 2016). In most studies carried out in landslide areas using SRT, the first break collected included P-wave data (Armstrong et al, 2011;Bekler et al, 2011;Capizzi and Martorana, 2014;Donohue et al, 2012;Ferrucci et al, 2000;Göktürkler et al, 2008;Grit and Kanli, 2016;Havenith et al, 2002;Havenith et al, 2000;Heincke, 2005;Imani, 2020;Imani and Tian, 2018;Jacob et al, 2018;Karslı et al, 2017;Mezerreg et al, 2019;Nwankwo and Ugbena, 2019;Ostrowski and Lasocki, 2018;Otto and Sass, 2006;Samyn et al, 2012;Travelletti et al, 2010;Vanlı Senkaya et al, 2019;Zainal Abidin et al, 2012); however, some literature supplemented the landslide studies using S-wave refractions (Bichler et al, 2004;Jongmans et al, 2009;Ozcep et al, 2012;Uhlemann et al, 2016;Yilmaz and Kamaci, 2018).…”