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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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Earth science > Seismology 
radiation pattern of waves
Earth science; Seismology
A geometric description of the amplitude and sense of initial motion distributed over the P and S wavefronts in the vicinity of the source.
fault
Earth science; Seismology
A fracture along which there has been significant displacement of the two sides relative to each other parallel to the fracture. Strike-slip faults are vertical (or nearly ...
operation basis earthquake
Earth science; Seismology
A US Nuclear Regulatory Commission term that specifies the maximum ground motion for which a reactor is expected to continue operating during and after the earthquake.
mantle wave
Earth science; Seismology
A very long-period (> 60 sec) surface wave (Rayleigh) with corresponding wavelengths of several hundred to about 1200 kilometers and are generated by the largest earthquakes. ...
seismograph
Earth science; Seismology
A very sensitive instrument used to record and measure earthquakes. During an earthquake, vibrations initiated by fracturing of the earth's crust radiate outward from the point ...
safe shutdown earthquake
Earth science; Seismology
A U. S. Nuclear Regulatory Commission term that specifies the maximum ground motion for which a reactor is expected to shut down safely without significant risk to the public.
rayleigh wave
Earth science; Seismology
A type of surface wave having a retrograde elliptical motion at the Earth's surface. These are the slowest, but often the largest and most destructive, of the wave types caused ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)