Reverse Time Migration for Extended Obstacles: Acoustic Waves
نویسندگان
چکیده
We consider the resolution of the single frequency reverse time migration (RTM) method for extended targets without the assumption of the validation of geometric optics approximation. The resolution analysis, which applies in both penetrable and non-penetrable obstacles with sound soft or impedance boundary condition on the boundary of the obstacle, implies that the imaginary part of the cross-correlation imaging functional is always positive and thus may have better stability properties. Numerical experiments are included to illustrate the powerful imaging quality and to confirm our resolution results.
منابع مشابه
Seismic Image and Ava Analyses Using the Reverse Time Migration (rtm) Method with Different Wave Equation Implementations
The purpose of this work is to present and analyze the results of numerical simulations related to the application of three different mathematical models in the acoustic seismic wave propagation in which only compressional waves (P-waves) are contemplated. And present the results of an investigation about how these wave equation implementations can influence the amplitudes of a migrated section...
متن کاملAcoustic wavefield imaging using the energy norm
Wavefield energy can be measured by the so-called energy norm. Using this norm, we propose an imaging condition that represents the total reflection energy and accounts for wavefield directionality in space-time, thus enabling us to attenuate backscattering artifacts in reverse-time migration (RTM). This imaging condition has the flexibility to attenuate any selected angle, and by exploiting th...
متن کاملInterferometric imaging of multiples in an RTM approach
It is well known that reverse-time migration is capable of correctly imaging multiply scattered energy. To do this, one of the interfaces from which the waves scatter must be included in the background velocity model. In a one-way framework this requirement is avoided by iteratively forming images of higher-order scattered waves. These techniques use an image made with singly scattered waves to...
متن کاملSolution of propagation of acoustic-gravity waves in the atmosphere using finite difference method of order two
Investigating waves propagation’s equation in the atmosphere is one of the important and widely used issues in various sciences, which has attracted many researchers. A type of propagating waves is an acoustic-gravity wave. These type of waves have a lot of stationarity properties and can be propagate to a high altitude in the atmosphere. The equation of acoustic-gravity wave propagation is a h...
متن کاملSelective Acoustic Focusing Using Time-Harmonic Reversal Mirrors
A mathematical study of the focusing properties of acoustic fields obtained by a time-reversal process is presented. The case of time-harmonic waves propagating in a nondissipative medium containing sound-soft obstacles is considered. In this context, the so-called D.O.R.T. method (decomposition of the time-reversal operator in French) was recently proposed to achieve selective focusing by comp...
متن کامل