Attenuation Relationship

Boore & Atkinson (2008) Attenuation Relationship

This Attenuation Relationship, which is one of the so-called NGA Models, is currently described in a pre-print of a forthcoming publication in Earthquake Spectra.

Supported Intensity Measure Types (IMTs):

Peak Ground Acceleration (PGA)
Peak Ground Velocity (PGV)
Spectral Acceleration (SA) - 5% damped at the following periods: 0.01, 0.02, 0.03, 0.05, 0.075, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.75, 1, 1.5, 2, 3, 4, 5, 7.5, and 10 seconds.

Independent Parameters (used to compute exceedance probabilities):

Earthquake Rupture Related Parameters:

Magnitude
Fault Type - options are Reverse (30<Rake<150), Normal (-150<Rake<-30), Strike-Slip (all other Rakes), or Unkown.

Site Related Parameters:

Vs30 - range of applicability is 180 to 1500 m/sec.

Propagation-Effect Related Parameters:

DistanceJB

Other Parameters:

Component (Average Horizontal (GMRotI50))
Standard Deviation Type (Total, Inter Event, Intra Event, or Zero)
Sigma Truncation (and Sigma Truncation Level)

More details can be found in their pre-print. , which is also available at David Boore's on-line list of publications.