Accuracy of the grid travel-time tracing methods proposed by Vidale (1988), Van Trier & Symes (1991), Pusey & Vidale (1991), Podvin & Lecomte (1991), Klimes & Kvasnicka (1994), and Klimes (1996) for the calculation of the first-arrival travel times is compared in simple constant velocity gradient models.
Seismic waves, first-arrival travel times, ray tracing, accuracy.
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This paper, with exception of the results of program NET (Fig.2),
has been appended to
Klimes, L.: Grid travel-time tracing: second-order method for the first arrivals in smooth media. In: Seismic Waves in Complex 3-D Structures, Report 3, pp. 157-174, Dep. Geophys., Charles Univ., Prague, 1995.
The resulting revised paper is
Klimes, L.: Grid travel-time tracing: second-order method for the first arrivals in smooth media. PAGEOPH, 148 (1996), 539-563.