Attenuation Relationship

Abrahamson & Silva (1997) Attenuation Relationship

This Attenuation Relationship was published by Abrahmson and Silva (1997, Seismological Research Letters, vol 68, num 1, pp 94-127).

Supported Intensity Measure Types (IMTs):

Peak Ground Acceleration (PGA)
Spectral Acceleration (SA) - 5% damped at the following periods: 0.0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.075, 0.09, 0.1, 0.12, 0.15, 0.17, 0.2, 0.24, 0.3, 0.36, 0.4, 0.46, 0.5, 0.6, 0.75, 0.85, 1.0, 1.5, 2.0, 3.0, 4.0, and 5.0.

Independent Parameters (used to compute exceedance probabilties):

Earthquake Rupture Related Parameters:

Magnitude
Fault Type (Reverse, Reverse-Oblique, or Other)

Site Related Parameters:

Site Type (Rock/Shallow-Soil or Deep Soil)

Propagation-Effect Related Parameters:

DistanceRup
On Hanging Wall? (true or false)

Other Parameters:

Component (Average Horizontal)
Standard Deviation Type (Total or Zero)
Sigma Truncation (and Sigma Truncation Level)

Model Details: see the above referenced publication.