Dresden 2013 – scientific programme

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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 9: Verification of the Comprehensive Test Ban Treaty

AGA 9.3: Talk

Friday, March 8, 2013, 10:30–11:00, HSZ-04

Analysis of acoustic-seismic coupling behaviour for CTBT on-site inspection performance improvement — •Mattes Liebsch and Jan-Frederik Knoop — Technische Universität Dortmund, Germany

After teleseismic detection of a big underground explosion, during on-site inspections under the Comprehensive Nuclear Test-Ban Treaty (CTBT) weak seismic signals from aftershocks are to be detected. These, however, can be masked by soil vibrations which are caused by acoustic waves which couple to the ground. To analyse the coupling behaviour between acoustic waves and soil vibrations several experiments with different acoustic sources (helicopters, firecrackers, loudspeaker) were performed. Of special interest is the influence of surface waves, excited in a larger area around the sensor, which can superpose constructively at the position of the sensor and can increase the measured seismic signal. A better understanding of the acoustic-seismic coupling can be used to develop guidelines for seismic aftershock measurements, such as a suitable sensor setup, with the goal of reducing or even preventing disturbing signals to improve the performance of on-site inspections for the CTBT.