Document Type

Conference Paper

Publication Date


Publication Details

J. Duro, D. Albiol, O. Mora and B. Payàs, Application of advanced InSAR techniques for the measurement of vertical and horizontal ground motion in longwall minings, 13th Coal Operators' Conference, University of Wollongong, The Australasian Institute of Mining and Metallurgy & Mine Managers Association of Australia, 2013, 99-106.


Synthetic aperture radar interferometry technology detects ground motion with millimetric precision. The measurements are taken remotely from space and represent a very efficient tool for ground motion measurement even in large and remote areas where land-based measurement techniques are inconvenient and costly. Furthermore and due to the availability of archive radar images, InSAR technology is the only technology able to provide measurements of ground deformations that occurred in the past. Past data allow the establishment of early baselines before any coal production starts and before any subsidence induced by previous production activities. This allows the total levels of subsidence to be identified and allows mine decision-makers to determine the vulnerable zones that could be affected by subsidence. Results of a recent ground motion study on a longwall mine in the Southern Coalfields of NSW, Australia are discussed. The results were obtained using an advanced differential interferometric chain, Stable Point Network, (SPN) which is capable of processing radar images at millimetric precision and very high density of measurements. The paper aims to compare the advanced InSAR retrieved motion with surveying data and to show that InSAR can retrieve the vertical and the horizontal motion that can be present in this type of mining.