Natural mass movements in Serra do Divisor in the far west of the Western Amazon

• Autor(a) principal: Silva, Sonaira Souza da
• Data de Publicação: 2022
• Outros Autores: Nascimento, Eric de Souza, Almeida, Marllus Rafael Negreiros de, Koga, Diogo Mitsuru, Melo, Antonio Willian Flores de, Araújo, Edson Alves de, Brown, Irving Foster, Amaral, Eufran Ferreira do, Costa, Jéssica Gomes da, Souza, Geane da Conceição
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/24724
• topic: Erosão; Eventos tectônicos; Precipitação; Relevo; Evolução da paisagem.; Erosión; Eventos tectónicos; Precipitación; Relieve; Evolución del paisaje.; Erosion; Tectonic events; Precipitation; Relief; Landscape evolution.

Mass movements, also known as landslides, landslides and erosions, cause the soil to break down and transport, caused by natural factors such as precipitation, earthquakes or winds. These events have environmental and/or social impacts, depending on the geographic context in which they are inserted. The present work aimed to analyze the spatiotemporal dynamics of natural movement in the Serra do Divisor Physiographic Complex and its modification of the landscape. For this purpose, Landsat images were retrieved and the extent of changes over 18 years and their correlation with precipitation and tectonic events were evaluated. The results revealed that there was an increase of up to eight times in soil loss after the year 2010. This fact is associated with steep relief conditions, monthly precipitation above 300 mm (millimeters) and tectonic events of magnitude greater than 6 mb (magnitude of primary waves). The natural mass movements in the northern region of the Serra do Divisor Physiographic Complex are part of the natural dynamics of landscape evolution in the region, however when precipitation events and high magnitude earthquakes, even at high depths, had results in triggering movement processes of mass of more than 3,000 ha. The study region, formed by sandstone rocks, shallow and pedogenically young soils, even under native forest cover, is vulnerable to soil erosion by mass movements.