Regensburg 2016 – wissenschaftliches Programm

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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 2: Seismic and Accoustic Modeling for Verification

AGA 2.2: Vortrag

Mittwoch, 9. März 2016, 17:00–17:30, H3

Acoustic-Seismic Coupling of Broadband Signals - Analysis of Potential Disturbances during CTBTO On-Site Inspections — Mattes Liebsch and •Jürgen Altmann — Experimentelle Physik III, Technische Universität 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 signals caused by airborne acoustic sources: When sound of aircraft hits the ground it excites soil vibrations which can mask the weak aftershock signals. With a better understanding of the acoustic-seismic coupling we aim to suggest new guidelines to improve sensitive seismic CTBT on-site inspection measurements. We measured sound pressure and soil velocity caused by overflying jet aircraft. In the seismic data we observed frequency- and angle-dependent interference patterns. These can be used to determine soil properties such as propagation velocity and depth of a buried boundary layer and to estimate the path of propagation of acoustically induced soil vibrations.