机译:Extended isochron rays in prestack depth (map) migration
Russian Acad Sci, Siberian Branch, Inst Petr Geol & Geophys, Novosibirsk, Russia.;
Purdue Univ, Ctr Computat & Appl Math, W Lafayette, IN 47907 USA.;
DOWNWARD CONTINUATION APPROACH; INVERSE SCATTERING; SEISMIC IMAGE; TIME; TRANSFORM; DOMAIN;