ABSTRACT: KM2 and KM3-lignite seams occur in the Kısrakdere coal zone of Miocene aged Soma formation. Thethickness of the KM2 coal seam varies between 1 and 25 meters above the contact with the underlying mudstonesat the base of the Neogene sequence in the Soma-Eynez coal field. This field is one of the major coal productionareas in Turkey. Underground coal production has been conducted in the KM2-coal seam located above theM2-marl unit with Miocene in age. Subsurface openings in Işıklar longwall-panels is located at 291 m depthfrom the ground-surface level created due to the underground coal mining. Limestone (M3) and marl (M2)layers deformed and formed a jointed structure due to the subsidence. Thus, these voids fractured and collapsedinto the openings, with resultant lowering of the ground surface on the run-off mine road. The boundary of thesurface area affected from the subsidence is defined by the angle of influence. Subsidence caused differentialsettlement, with the greatest amount on a fault zone which vertically cuts the longwall panels, not near thecenter of the opening. As a result, asymmetrical subsidence profile developed in the area. The extend and size ofground surface cracks are expected to increase until the subsidence is completed in the area. The developmentof ground-crack patterns on the run-away mine showed some differences along the subsidence profile. Differentcrack patterns were observed in the extraction and the gap zones (subsided zone) of this profile. These patternswere used in the constitution of subsidence profile in this work. Subsidence was investigated in the cross-sectionsconstructed by either vertical or parallel to the run-off mine road. Different break angles were determined onthese sections. The causes obtained different break angles are due to the preparation of the cross-sections bothparallel and vertical to the fault zone and the coal seam, and different topography. Because the cross-sectionconstructed in N-S direction has a topography with slope. The angle of influence (limit angle) about the coalproduction panels were investigated in two different cross-sections. In the cross-section with N-S direction, limitangles for both sides of the longwall panel were determined by using the finite element method. In the crosssection with E-W direction, limit angles were determined on the cross-section produced with the help of thedifferent subsidence crack patterns developed on the ground surface and the measurements of deformation onthe survey points along the run-off mine road. The results obtained from the two methods were correlated witheach other. It was determined that angular differences acquired from the two methods have a range changingbetween 7° and 10°.