Seismic Tomography 2
Seismic Tomography 2 :
An imaging method using a set of seismic travel-times, amplitudes or waveforms data obtained from seismographs distributed over the Earth's surface to deduce the 3D velocity and/or attenuation/scattering structure of the Earth's interior. In most cases, velocity structures are obtained from the travel-time data. Various computational techniques have been developed for data from different types of seismic sources including natural earthquakes as well as controlled sources like explosions, airguns and bore-hole sources. However, it can be shown that collocated measurements of the ratio of rotations (or strain) and corresponding components of translational motions contain also information on the subsurface velocity structure (e.g., Fichtner and Igel, 2009). See also Curtis and Snieder (2002)
