This study investigated the influence of geology, geomorphology, rainfall and land use on a recent landslide at Okeigbo. Samples of rocks and slope materials were collected during field investigation and were subjected to petrographic analysis and geotechnical tests respectively. Grain size analyses, shear strength analyses and permeability test were conducted on nine samples of disturbed slope materials site to classify the soil. Daily rainfall record for 2008, 2009, 2010, 2011 and 2013 were collected and analyzed using the rainfall duration-cumulation threshold method. Terrain and Land use analysis were carried out to evaluate the impact of landslide on the study area. Field mapping and petrographic studies showed that the bedrock were highly fractured and deformed quartzite schist with mineral composition of quartz (98%) and muscovite mica (2%). Grain size analysis showed that the residual soils consist of sand (80%), gravel (16%) and clays (4%) thus, classified as gravely sands. The coefficient of permeability derived for the soils vary between 0.01 and $1m{s}^{-1}$ indicating high permeability. Rainfall analysis showed that the landslide was triggered after a rainfall with duration of three days and total cumulation of 158 mm. The slope of the site ranged between ${26.83}^o$ and ${6.73}^o$ and the direct shear test showed that the disturbed soils had an average cohesion of 6.08 kPa and internal friction of ${6.67}^o$ which indicated poor structural and shearing strength making the soil susceptible to re-occurrence. The geomorphology of the area, nature of the slope materials, agricultural activities and rainfall were observed to have reduced the effective shear strength of the residual soils in the study area.

这项研究调查了地质，地貌，降雨和土地利用对Okeigbo最近一次滑坡的影响。在野外调查期间收集了岩石和斜坡材料样品，分别进行了岩石学分析和岩土工程测试。对9个扰动的边坡物料位点进行了粒度分析，抗剪强度分析和渗透性测试，以对土壤进行分类。收集了2008年，2009年，2010年，2011年和2013年的日降雨量记录，并使用降雨持续时间累积阈值方法进行了分析。进行了地形和土地利用分析，以评估滑坡对研究区域的影响。野外测绘和岩石学研究表明，基岩高度断裂，石英岩片岩变形。与石英的矿物组合物（98％）和白云母云母（2％）。粒度分析表明，残留的土壤由沙子（80％），砾石（16％）和粘土（4％）组成，因此被归类为严重的沙子。从土壤中得出的渗透系数在0.01到0.01之间变化。$\mathrm{1个}米s^{-\mathrm{1个}}$表示高渗透率。降雨分析表明，滑坡是在降雨持续三天，总累积量为158毫米之后触发的。场地的坡度介于${26.83}^{Ø}$ 和 ${6.73}^{Ø}$ 直接剪切试验表明，受扰动的土壤的平均内聚力为6.08 kPa，内摩擦系数为。 ${6.67}^{Ø}$这表明结构和剪切强度差，使土壤易于再次发生。观察到该地区的地貌，斜坡材料的性质，农业活动和降雨降低了研究区残余土壤的有效抗剪强度。