Seismicity

Seismic Design Requirements - index
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July 2006

H-18-8

1.11 Seismicity

Region of Seismicity

> 1.250g

> 0.500g

Very High

< 1.250g

< 0.500g

High

> 0.750g

> 0.300g

< 0.750g

< 0.300g

Moderate High

> 0.350g

> 0.140g

< 0.350g

< 0.140g

Moderate Low

> 0.250g

> 0.100g

< 0.250g

< 0.100g

Low

Note: values for SS and S1 at all VA sites are given in Table 4.

1.12 Soft Story & Extreme Soft Story: As defined in ASCE 7, Table 12.3-2.

1.13 Spectral Response Acceleration: A parameter used to characterize the

anticipated earthquake shaking at a given site. (Table 4)

Ss: Spectral acceleration parameter at short periods corresponding to the mapped

maximum considered earthquake.

S1: Spectral acceleration parameter at a period of 1 sec corresponding to the

mapped maximum considered earthquake.