Abstract
The detection and monitoring of mass movement of susceptible slopes plays a key role in mitigating hazards and potential damage associated with creeping slopes and landslides. In this paper, we use observations from both Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) to assess the slope stability of the Sarcheshmeh ancient landslide in the North Khorasan province of northeast Iran. InSAR observations were obtained by the time-series analysis of Envisat SAR images covering 2004–2006, whereas repeated GPS observations were conducted by campaign measurements during 2010–2012. Surface displacement maps of the Sarcheshmeh landslide obtained from InSAR and GPS are both indicative of slope stability. Hydrogeological analysis suggests that the multi-year drought and lower than average precipitation levels over the last decade might have contributed to the current dormancy of the Sarcheshmeh landslide.
Highlights
Landslides are one of the most destructive natural hazards that threaten human lives and influence the socioeconomic condition of many countries
Because Global Positioning System (GPS) supplies a higher degree of horizontal accuracy than vertical accuracy [27], displacement results from GPS measurements are just computed and investigated for a 2D horizontal network to assess the current rate of deformation on the Sarcheshmeh landslide
This indicates that these reference stations are on stable ground and that the difference between corresponding coordinate components in sequential epochs results from stochastic error originating from various GPS environmental and instrumental sources of errors [27]
Summary
Landslides are one of the most destructive natural hazards that threaten human lives and influence the socioeconomic condition of many countries. 2013, 5 is caused by gravitational force as the primary factor [1]. Other triggering factors, such as rainfall, earthquakes, floods or human activity may influence the occurrence of this geologic event. Because of its specific geologic, morphologic, climatic and tectonic settings, Iran is one of the most landslide-prone areas in the world. By the year 2000, approximately 2600 landslides, which were responsible for 162 deaths, 176 fully destroyed houses and 170 damaged roads, were detected and mapped by experts from various government agencies in the country [2].
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