refraction  search
RTdiffraction
 elastic waves
 electrical methods
 geophysical surveys
SNFor seismic studies, use refraction methods. For minerals, use refractive index.
refraction method  search
refraction methods  search
BTgeophysical methods
 .refraction methods
RTseismology
 acoustical methods
 geophysical surveys
 seismic methods
 electrical methods
 ECORS
 diffraction
 sonobuoys
SNRestricted to geophysical methods; most commonly used for seismic methods. Indexed with seismic methods or other types of methods as applicable.
refraction waves  search
SNAs of 1981, no longer a valid index term for GeoRef. Before 1978, also search ocean waves AND refraction.