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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 10: Verification by Seismic Signals

AGA 10.1: Talk

Friday, March 21, 2014, 12:00–12:30, DO24 Reuter Saal

Modelling Seismic-Signal Propagation at a Salt Dome - Research for Nuclear Safeguards at an Underground Final Repository — •Jürgen Altmann — Experimentelle Physik III, Technische Universität Dortmund

Final repositories for spent nuclear fuel need to be put under safeguards of the International Atomic Energy Agency (IAEA) to detect potential access, during and after the emplacement phase. After a series of measurements the Gorleben exploratory mine, I am now modelling the propagation of seismic signals caused by mining activities to potential monitoring sites close to and within the salt dome, mostly underground, again tasked by the German Support Programme to the IAEA. Using the open program SpecFEM, incorporating the inhomogeneous underground structure and simple source functions, the wave spreading is computed in two and three dimensions; attenuation is incorporated using constant quality factors for the different media. For statements on the detection capability, amplitudes and spectral content are compared with the characteristics of typical background noise.