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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 8: Acoustic and Seismic Signals for Safeguards and Verification

AGA 8.2: Vortrag

Mittwoch, 18. März 2015, 17:30–18:00, EMH 225

Acoustic-Seismic Coupling of Broadband Signals - Analysis of Potential Disturbances during CTBT On-Site Inspection Measurements — •Mattes Liebsch — Experimentelle Physik III, TU Dortmund

In the framework of the verification of the Comprehensive Nuclear Test-Ban Treaty (CTBT) the localization of possible buried nuclear explosion sites is important. In order to localize these sites sensitive seismic measurements of so-called aftershocks can be performed, which, however, can be disturbed by different signals. In this research we focus on disturbances caused by airborne sources: When sound of aircraft hits the ground it excites soil vibrations which can mask weak aftershock signals. With a better understanding of the acoustic-seismic coupling we aim to suggest new guidelines to improve sensitve seismic CTBT on-site inspection measurements. We measured sound pressure and soil velocity of various sources e.g. jet-aircraft. In the seismic data we observed interference patterns which can be used to estimate the path(s) of propagation of acoustically induced soil vibrations. The frequency-dependent phase offset between different sensors is used to estimate the propagation velocity of soil vibrations.