RAPID-N

Property Estimator

Name	Boatwright et al. (2003)
Property	Peak Ground Acceleration
Type	Function
Function	`$f1 = 1.45 + ([Mw] > 5.5 ? 0.31 : 1) * ([Mw] - 5.5); $f2 = [dh:km] > 27.5 ? 27.5 * pow([dh:km] / 27.5, 0.7) : [dh:km]; $f3 = 0.0073 * ([Mw] > 5.5 ? pow(10, -0.3 * ([Mw] - 5.5)) : 1); $amp = [ "A" => 0.79, "B" => 0.79, "C" => 1.00, "D" => 1.35, "E" => 1.64 ]; return pow(10, ($f1 - log10($f2) - $f3 * [dh:km] + log10($amp[[NEHRP]])))/9.81;`
Unit	g
Validity Conditions	Moment Magnitude: 3.3–9.1; Hypocentral (Focal) Distance: < 370 km
Precedence	Auto
Disabled	No
References	Boatwright, J.; Bundock, H.; Luetgert, J.; Seekins, L.; Gee, L.; Lombard, P., "The dependence of PGA and PGV on distance and magnitude inferred from Northern California ShakeMap data", 2003 Douglas, John , "Ground motion prediction equations 1964 - 2021", 2022
Notes	1. See Douglas (2022), page 138. https://rapidn.jrc.ec.europa.eu/reference/152?__process=9880 2. See Boatwright et al. (2003), graph in Figure 7 https://rapidn.jrc.ec.europa.eu/reference/2?__data=4295 Validation: M = 5.0, d = 10 km, NEHRP = "C" : PGA = 0.077 g M = 6.0, d = 10 km, NEHRP = "C" : PGA = 0.364 g M = 5.0, d = 100 km, NEHRP = "C" : PGA = 0.002 g
Access	Public