# Dictionary:A

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Series Geophysical Reference Series Robert E. Sheriff http://dx.doi.org/10.1190/1.9781560802969 978-1-56080-118-4 SEG Online Store
1. Ampere (q.v.), the SI unit of electrical current.
2. See A-type section.
3. The amplitude at normal incidence in AVO studies, where the amplitude is often approximated by the equation ${\displaystyle A+B\sin ^{2}\theta }$, where ${\displaystyle \theta }$ is the angle of incidence.