Body-wave tomography

Although the results reported here represent only an initial examination of a vast seismic dataset, there is little evidence to date in body-wave tomography, surface-wave inversion, or receiver function analysis of deep discontinuity structure for a low-velocity zone beneath the cratonic root. High-resolution seismic studies of the upper mantle are continuing, however, and more sophisticated analysis may yet reveal a velocity reversal at the base of the tectosphere. 

Ambient noise tomography Body-wave tomography Magma sources Seismic observations on volcanoes Seismic properties of crust Seismic tomography... 

In the ray-based approach which is used in most body-wave tomography algorithms, seismic... 

Up to date, the noise-based seismic tomography was based on surface waves that are most easily extracted from noise cross-correlations but have a limited resolution in deep layers. Most recent results demonstrate that, when working with large and dense arrays of seismometers, it is possible to indentify body waves in correlation waveforms and to measure their travel times (e.g., Boue et al. 2013 Lin et al. 2013). This gives a hope that noise-based body-wave tomography of volcanoes could be developed in the future. 

Seismic Tomography Methods Based on Body Waves... 

Basic Principle of Body-Wave Seismic Tomography... 

By using continuous records of ambient seismic noise from the PdF Volcano observatory short-period seismic network, Brenguier et al. (2007) were able to measure Rayleigh wave velocity dispersion curves obtained from the cross-correlations of 18 months of ambient seismic noise. The tomography of these measurements as well as the depth inversion led to a high-resolution image of the shallow sfructure of PdF Volcano (Fig. 2). The results show a high seismic velocity body located in the central part of the... 

Seismic Tomography of Volcanoes ) with body or surface waves from active or passive sources, or using ambient seismic noise (see Noise-Based Seismic Imaging and Monitoring of Volcanoes and Seismic Noise ). 

In Ultrasound computed tomography, the interaction between ultrasound wave and the body is used to determine the distribution of sound velocity c and the tissue density p. Ultrasound signals are stimulated and received by piezoelectric transducers. Received data is also processed by above mentioned algorithms, i.e by applying Fourier transform algorithm in order to reconstruct internal stmctures of the body as indicated in the following diagram ... 

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