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IGiG Scientific Seminar - Dr Maya Ilieva

28-03-2023

IGG is pleased to invite you to a scientific seminar, which will be held in a hybrid format. The main event will be held at the IGIG library (100G). Moreover, you will be able to connect remotely on the Zoom platform. The presentation entitled "Source modelling for terrain subsidence in underground mining areas based on InSAR measurements" will be given by Dr. Maya Ilieva from our institute.

The seminar will begin on Thursday, March 30, 2023 at 09:00 AM (CEST).


Join the Zoom meeting: ZOOM LINK.
Meeting ID: 811 427 0260
Access code: igig


Modeling sources of land subsidence in underground mining areas based on InSAR measurements.
Dr. Maya Ilieva, Institute of Geodesy and Geoinformatics, UPWr.


Abstract:
The classical approach widely applied in Poland and abroad for prediction of the terrain responses to underground mining works lays on the Knothe-Budryk formulation (1953) of the geometric integration theories of influence. To estimate the predicted ground subsidence according to this method, prior knowledge about the size, shape and depth of the exploitation, as well as the range and scale of the subsidence area, is needed. For study areas where the information about the geometry of the exploitation is not accessible, an approximation of the source of the displacement could be incorporated. The satellite interferometry with Synthetic Aperture Radar (InSAR) provides useful tool for change detection with areal coverage and significant frequency – 11-12 days, even six days for the data from Sentinel-1A and B satellite constellation. This detailed, in time and space, picture of the surface deformation can be used to model the source of it by applying the Okada definition (1985) for internal displacement in elastic half-space. There are well documented various cases of applying the Okada model for describing the fault sources of natural earthquakes. While, some authors investigated the possibilities to apply the Okada theory for describing the deformations related with point or limited area sources like volcano eruptions and mine collapses. We investigate the possibilities for defining the caving shape and depth, corresponding to the panel of coal extractions. Such results will give us an advance in the following prediction and stress transfer.