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Open AccessArticle

Ground Deformation in The Ciloto Landslides Area Revealed by Multi-Temporal InSAR

1
Institute of Geodesy and Photogrammetry, Technische Universität Braunschweig, Bienroder Weg 81, 38106 Braunschweig, Germany
2
Department of Geomatics Engineering, Institut Teknologi Sepuluh Nopember, 60111 Surabaya, Indonesia
3
Department of Geodesy and Geomatics Engineering, Institut Teknologi Bandung, 40132 Bandung, Indonesia
*
Author to whom correspondence should be addressed.
Geosciences 2020, 10(5), 156; https://doi.org/10.3390/geosciences10050156
Received: 2 April 2020 / Revised: 22 April 2020 / Accepted: 23 April 2020 / Published: 27 April 2020
(This article belongs to the Special Issue Satellite remote sensing for landslide monitoring and mapping)
Landslides are one of the natural hazards that occur annually in Indonesia. A continuous geodetic observation in the landslide prone area is essential to support the precautionary measures. Because of its hilly topography, torrential rainfall and landslide history, the Ciloto district in Indonesia has been affected by ground deformation for an extended period of time. The purpose of our study is to detect significant movement and quantify the kinematics of its motion using the Interferometric synthetic aperture radar (InSAR) time series analysis and multi-band SAR images. We utilized the small baseline SDFP technique for processing multi-temporal SAR data, comprising ERS1/2 (1998–1999), ALOS PALSAR (2007–2009), and Sentinel-1 (2014–2018). Based on the detected deformation signal in the Ciloto area, the displacement rates are categorized as very slow movements. Two active main landslide zones; the Puncak Pass and the Puncak Highway area, which show the trend of slow movement progressively increasing or descreasing, were detected. The integration of the velocity rate between InSAR results and ground observations (e.g., terrestrial and GPS) was conducted at the Puncak Highway area from the temporal perspective. Using the polynomial model, we estimated that the area had cumulatively displaced up to −42 cm for 25 years and the type of movements varied from single compound to multiple rotational and compound. View Full-Text
Keywords: active landslide; slow deformation; multi-temporal InSAR; small-baselines active landslide; slow deformation; multi-temporal InSAR; small-baselines
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Hayati, N.; Niemeier, W.; Sadarviana, V. Ground Deformation in The Ciloto Landslides Area Revealed by Multi-Temporal InSAR. Geosciences 2020, 10, 156.

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