Motivation The Comprehensive-Nuclear-Test-Ban-Treaty (CTBT) aim to prohibit any nuclear explosion on Earth. For its realization a nuclear test verification strategy has to be set up, consisting of three pillars: •Monitoring • International Data Center •On-Site Inspection (OSI) OSI aims to be the ultimate tool to clarify wether or not a nuclear test has been carried out in violation of the CTBT....

When averaged over sources or disorder, cross correlation of diffuse fields yields the Green's function between two passive sensors. This technique is applied to elastic ultrasonic waves in an open scattering slab mimicking seismic waves in the Earth's crust. It appears that the Rayleigh wave reconstruction depends on the scattering properties of the elastic slab. Special attention is paid to t...

Different forms of fluctuations of the terrestrial gravity field are observed by gravity experiments. For example, atmospheric pressure fluctuations generate a gravity-noise foreground in measurements with super-conducting gravimeters. Gravity changes caused by high-magnitude earthquakes have been detected with the satellite gravity experiment GRACE, and we expect high-frequency terrestrial gra...

This paper summarizes the initial developments of a research program that is underway to evaluate the efficacy of passive settings to seismically protect sets and pieces of equipment of essential facilities. Specifically, this paper presents case studies based on detailed numerical analysis using models that were validated with available experimental data. The case studies confirmed that: 1) am...