INSAR TIME SERIES ANALYSIS OF COAL MINING IN ZONGULDAK CITY, NORTHWESTERN TURKEY

This paper presents preliminary results of the subsidence monitoring of a coal-mining field in Zonguldak Province using Interferometric Synthethic Aparture Radar (InSAR) time series. It is a coastal urban area in northwestern Turkey that is prone to human-induced environmental problems such as collapse due to the coal-mining. Severe deformations have been known since the 1900s. Many people have lost their lives, and many buildings have been damaged in the region. The aim of this study is to investigate the subsidence that causes damage in dwelling units and mining areas. For this purpose, ENVISAT ASAR images were acquired in two different geometries (one ascending and one descending track), which cover the same areas. Persistent Scatterer Interferometry (PSI) and Small Baseline Interferometry (SB) time series have been analyzed and compared. Time series were constructed using the Stanford Method for Persistent Scatterers (StaMPS) package with both PSI and SB approaches. Between 2003 and 2010, the deformation was estimated to be approximately 20 to 140 mm in the urban areas near the Kozlu mining area. Areas of subsidence in the rural regions were also revealed at Karadon and Uzulmez. The maps of underground mining tunnels show that these surface deformations are most probably due to mining.