Seismic imaging is a technology for creating images of the Earth's
interior by using recordings of reflected seismic waves. While
depth-domain imaging attempts to produce images in true depth
coordinates, time-domain imaging takes a shortcut by using distorted
coordinates and more robust and efficient numerical algorithms.
Mathematically, this involves approximations of the wave equation
Green's functions that appear in seismic imaging operators. In this
presentation, I will describe the latest developments in time-domain
imaging algorithms and in transforming time-domain images to depth.