1989 Loma Prieta, Alameda Naval Air Stn Hanger

Ground motion information:

NGA Record Sequence Number 738

Magnitude = 6.9
Closest Distance = 71 km
Hypocentral Distance = 92.43 km
Vs30 = 190 m/s
Mechanism = Reverse-oblique

T_p = 2.1 s
PGV = 40.8 cm/s

Orientation of strongest pulse, relative to north = 254 degrees
Orientation of strongest pulse, relative to fault parallel = 54 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 0

Comments:

Soft soil site. Too far away to be directivity

Directivity parameters:

X = 0.5
s = 20.02 km
θ = 28

Y = 0.81
d = 14.53 km
φ = 47.7

IDP = 2.1
Rowshandel parameter = 0.12