air  search
RTair-water interface
 atmosphere
 background level
 Clean Air Act
 critical load
 pollution
air fields  search
USEairports
air guns  search
UFairguns
RTinstruments
 acoustical methods
 geophysical methods
 seismic methods
SNAdded to Thesaurus in 1985.
air-sea interface  search
UFinterface, air-sea
RToceanography
 aerosols
 atmosphere
 meteorology
 air-water interface
 atmospheric transport
 boundary interactions
 interfaces
air-water interface  search
UFwater-air interface
RTair-sea interface
 air
 interfaces
 water
SNUse air-sea interface if applicable.
Aira Caldera  search
BTAsia
 .Far East
 ..Japan
 ...Kyushu
 ....Kagoshima Japan
 .....Aira Caldera
RTOntake
 Sakura-jima
SNKagoshima Prefecture, Kyushu, S Japan.
airborne  search
SNA valid index term through 1977. After 1977, use airborne methods.
airborne methods  search
NTAVHRR
 AVIRIS
RTaeromagnetic maps
 aircraft
 geophysical methods
 geophysical surveys
 ground methods
 magnetic methods
 multispectral scanner
 photogeology
 remote sensing
 SAR
 SLAR
 thematic mapper
 total-field methods
 vertical-gradient methods
SNBefore 1978, also search airborne.
Airborne Visible-Infrared Imaging Spectrometer  search
USEAVIRIS
aircraft  search
RTairborne methods
 ash clouds
 flight
 geologic hazards
 safety
 volcanic risk
SNFor ground facilities, use airports. Also search aviation safety if applicable.
airfields  search
USEairports
airglow  search
SNAs of 1981, no longer a valid term. Usually out of scope for GeoRef. Used with ionosphere.
airguns  search
USEair guns
airports  search
UFair fields
 airfields
 aviation facilities
RTpollution
 engineering geology
 environmental geology
 land use
 military facilities
SNIndexed with military facilities if applicable.
Airy waves  search
BTelastic waves
 .Airy waves
RTseismology
 waves
 seismic waves
 surface waves