Specifies the velocity-based site coefficient Fv. This value adjusts the mapped one-second period acceleration and is based on site class (soil profile) and the mapped one-second period maximum considered earthquake acceleration (S1). Values range from 0.8 to 3.5.
ASCE 7
Fv is listed in Table 11.4-2.
IBC
Fv is listed in Table 1615.1.2(2).