1. Allen CR and Helmberger DV (1973). Search for temporal changes in seismic velocities using large explosions in southern California. In: Proceedings of Conference on Tectonic Problems of the San Andreas Fault System. Stanford University, Palo Alto, pp 436–445
2. Modeling strong motions produced by earthquakes with two-dimensional numerical codes;Helmberger;Bull Seismol Soc Am,1988
3. The October 1980 earthquake sequence near the new hebrides;Vidale;Geophys Res Lett,1983
4. Finite-difference seismograms for SH waves;Vidale;Bull Seismol Soc Am,1985
5. Finite-difference calculation of travel times;Vidale;Bull Seismol Soc Am,1988