Regensburg 2016 – scientific programme

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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 2: Seismic and Accoustic Modeling for Verification

AGA 2.1: Talk

Wednesday, March 9, 2016, 16:30–17:00, H3

Nuclear Safeguards for an Underground Final Repository - Seismic-Signal Modelling and Theory — •Jürgen Altmann — AG Physik und Abrüstung, Experimentelle Physik III, TU Dortmund

Final repositories for spent nuclear fuel need to be put under safeguards of the International Atomic Energy Agency (IAEA) to detect undeclared access, during and after the emplacement phase. Following a measurement project, the propagation of seismic signals from mining activities through a salt dome and its surroundings was modelled, again for the German Support Programme to the IAEA. Due to many different layers and complex geometry, numerical computation was needed. As excitation a norm force pulse and an explosion with a norm seismic moment were used at several source positions. The resulting seismic velocity was computed at many potential monitoring sites. The amplitudes scale with the force or seismic moment, respectively; both are not known for most sources. Since the model calculations have shown that the transmission through geological-layer boundaries does not change the seismic amplitude drastically, the hope is justified that the analytical expressions that exist for a homogeneous medium can provide reasonable estimates of the signal strengths and that comparison with measured values can allow conclusions on the respective source strengths.