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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 10: Verification by Seismic Signals

AGA 10.3: Vortrag

Freitag, 21. März 2014, 13:00–13:30, DO24 Reuter Saal

Analysis of Acoustic-Seismic Coupling for CTBT On-Site Inspection Support — •Mattes Liebsch — Experimentelle Physik III, TU Dortmund

The measurements of weak seismic signals, e.g. aftershock measurements during an on-site inspection for the Comprehensive Nuclear Test-Ban Treaty (CTBT), can be masked by man-made disturbances. These can be caused by airborne signals, like the noises of aircraft or helicopters, which couple to the ground and excite soil vibrations. We have measured sound pressure and corresponding soil vibrations caused by aircraft and by signals produced artificially with a speaker. Methods of acoustic deadening were applied to reduce the incident acoustic power locally. The influence on soil vibrations in different depths below the surface is investigated. The underlying question was whether the coupling of sound happens locally or soil vibrations created in a wide area around the sensor sum up to the total seismic signal. A better understanding of acoustic-seismic coupling can be used to develop guidelines for seismic aftershock measurements in order to improve the performance of on-site inspections for the CTBT.