Elastic reverse time migration (E-RTM) has limitations when the migration velocities contain strong contrasts. First, the vector-based imaging condition needs to use the reflector-image normal, and also cannot
Vector-basedAngle-dependentImaging conditionIn recent years, many studies have focused on elastic reverse time migration (RTM). In response to the issues involved in elastic RTM, we propose a new procedure for 2D elastic multicomponent RTM. The decomposed P- and S-wave components are obtained ...
In recent years, many studies have focused on elastic reverse time migration (RTM). In response to the issues involved in elastic RTM, we propose a new procedure for 2D elastic multicomponent RTM. The decomposed P- and S-wave components are obtained from the decoupled propagation of the ...
Elastic reverse time migration (E-RTM) has limitations when the migration velocities contain strong contrasts. First, the traditional scheme of P/S-wave mode separation is based on Helmholtz's equations, which ignore the conversion between P-and S-waves at the current separation time. Thus, it...
Prestack elastic reverse time migration ( RTM ) requires m ulticom ponent seismic data. But for multicomponent elastic Kirchh off migration , there is alimitation that ray theory no longer applies if thegeology becomes com plicated . In this paper, the authors have created a new 2D m ig...
For the implementation of topographic separated-wavefield elastic least-squares reverse time migration, the wavefields, gradient directions and step lengths are all calculated in the curvilinear coordinates. Numerical experiments conducted with the two-component data synthetized by a three-topographic-layer ...
Angle-domain common-image gathers (ADCIGs) are an important product from reverse time migration (RTM). Using the Poynting vector (PV) to calculate propagation angles is efficient but suffers from instability problems. First, the PV can give only a single direction per grid point per time step...
elastic RTMIn conventional vector-wave-based elastic reverse-time migration, there are two types of artifacts: low-frequency artifacts and nonphysical artifacts. Vector-decomposition-based acoustic–elastic coupled equations are effective in suppressing nonphysical artifacts by using ocean bottom four ...
Elastic reverse-time migration can effectively deal with multicomponent seismic data in which the imaging condition based on energy norm can extract the scalar-imaging result from multicomponent data. However, the energy cross-correlation imaging condition characterized by particle velocity and stress ...
We test our method on several TI models. We furthermore apply our method to elastic reverse-time migration (RTM) in TI media.doi:10.1016/j.jcp.2018.12.024Liu, QianchengZhang, JianfengLu, YongmingGao, HongweiLiu, ShaolinZhang, HaoElsevier ScienceJournal of Computational Physics...