We present a method for the determination of crustal structure by simultaneous inversion of seismic refraction and wide-angle reflection traveltimes for 3-D interface geometry and layer velocity. Crustal structure is represented by layers in which velocity varies linearly with depth, separated by smooth interfaces with a cubic B-spline parametrization. Lateral variations in structure are theref...

Distributed subsurface imaging is of high relevance for autonomous seismic surveys by multi-agent networks as envisioned future planetary missions. The goal to achieve a cooperative reconstruction image at each agent relying on data exchange among the agents. To this end, distributed full waveform inversion high-resolution has been proposed. However, always requires an initial model subsurface....

[1] Traveltime determinations have found increasing application in the characterization of groundwater systems. No algorithms are available, however, to optimally design sampling strategies including this information type. We propose a first-order methodology to include groundwater age or tracer arrival time determinations in measurement network design and apply the methodology in an illustrati...

For a xed, central ray in an isotropic elastic or acoustic media, traveltime moveouts of rays in its vicinity can be described in terms of a certain number of parameters that refer to the central ray only. The determination of these parameters out of multicoverage data leads to very powerful algorithms that can be used for several imaging and inversion processes. Assuming two-dimensional propag...

Formulas described in this paper were designed for the use in least-squares tomographic inversion methods with improved flexibility of parametrizing the density-velocity model. The gravity effect of the considered volume fl is the sum of gravity effects of 2-3 or 2 1/2-D bodies of polygonal cross-sections which form the disjunctive decomposition of fi. For this geometrical arrangement analytica...

We have developed a case study of crosshole seismic tomography with a cross-firing geometry in which seismic sources were placed in two vertical boreholes alternatingly and receiver arrays were placed in another vertical borehole. There are two crosshole seismic data sets in a conventional sense. These two data sets are used jointly in seismic tomography. Because the local sediment is dominated...

We formulated an approach to estimate parameters of a layered earth model such as interval velocity, reflector depth, and dip by inverting reflected traveltime with constraints on dipping directions and depth to reflectors. We applied the “shooting method” (Lines, Bourgeois and Covey, 1984) to calculate modeled reflection time. We derived an explicit expression of the Jacobian matrix. The effic...