Respuesta de los deslizamientos de tierra a la dinámica de la precipitación, medida mediante radar interferométrico de apertura sintética: un caso de estudio en la parte sur de la Depresión Interandina Ecuador.

Abstract

Slow-moving landslides exhibit continuous, human-imperceptible downslope motion risking human settlements. Localizing the landslide's spatial extension and response under rainfall variation is vital for predicting the hazard for an area. Synthetic aperture radar interferometry (InSAR) time series is a useful geodetic technique to analyze temporal-spatial landslide behavior. Landslide displacement derived from InSAR represents seasonal, fast and slow motion fluctuation triggered by rainfall stationalities. Here, InSAR was used to identify landslides in the southern part of the Neogen Inter Andean Depression of Ecuador and correlate landslides' seasonal displacement with rainfall using wavelet analysis. Twenty landslides were identified from 2007 to 2011 and 2016 to 2022. Three landslides exhibit InSAR average velocity ranging from 7 millimeters per year to 26.5 millimeters per year. The wavelet analysis shows landslides correlate with rainfall in infra-annual, annual, and multiannual periods/scales. The results suggest that fast landslide displacement responses are related to high rainfall events, while annual and multiannual responses might relate to soil mechanic properties or groundwater processes.