Monitoring Lurigancho-Chosica, Perú Landslideusing Insar Technology

From January14th toMarch 11th 2017, constant rainfall produced by El Nino Phenomenon has suffered the capital of Lurigancho district, Chosica, located in Lima Peru. Due to heavy rains, in the period from January to March, many landslides occurred in differentstreams of Chosica, Huampani, Chacrasana, Pedregal, Quirio, Carosio, Corrales, Rosario, Mariscal Castilla Santo Domingo, California, and La Cantuta, ravines wereactivated, the first landslide occurred on January 14th, and the second one, occurred from March 15th to March19th of the year 2017. This rainstorm not only caused landslides, but also caused overflow of the Rimacriverthataffected 6,058 people, 2,015 homes and 10.75km communication routes. This studyisfocused on the Application of Persistent ScattererInterferometrySynthetic Aperture Radar (PSInSAR) Technique for mapping displacement produced by landslides. This research has been used Sentinel-1 SAR images, SLC 17 scenes in ascending orbit and 26 scenes in descending orbit, from October of 2014 to December of 2016.This study has been workedwithPSInSAR Technique, based in Time seriesInSAR, consideringChosicaLandslide as a debris flows with very slow displacement, this technology has used to acquire the deformation prior in the Line of sight direction (LOS). First, the displacement result in ascending and descending orbit has been obtain by processing with ENVI 5.3-Sarscape tool, it has applied Persistent Scaterrermethod. Second, Displacement result in descending orbit, has been compared and analyzed with the slipped areas after landslide in 2015 and 2017 identified using aerial photo provided by DIVRA (Direction of surveillance and aerial recognition). Posteriorly both orbits were combined spatially with the intention of getting Vertical (Up-Down) and Horizontal (East-West) DisplacementusingArcGis-Python tools.It maybe more useful to compare the result of the displacement using the PSI InSAR technique with the GPS technique, which would provide and test the accuracy of the results obtained by PSI. Could be ideal to usea DEM whose spatial resolution in meters can reached less than 30m, nevertheless SRTM 30m can be productively exploited. It is advisable to plant more treesaround the Chosica'sstreams, whichwill minimize the damage and protect the population and, since there is not much vegetation, when the rains appear and find the land devoid of it, the terrain loses stability and it produces landslide