1987 Whittier Narrows-01, Compton - Castlegate St

Ground motion information:

NGA Record Sequence Number 611

Magnitude = 6
Closest Distance = 23.4 km
Hypocentral Distance = 24.61 km
Vs30 = 309 m/s
Mechanism = Reverse-oblique

T_p = 0.87 s
PGV = 32.8 cm/s

Orientation of strongest pulse, relative to north = 25 degrees
Orientation of strongest pulse, relative to fault parallel = 75 degrees
Pulse in fault normal direction = 1
Pulse due to directivity = 0

Comments:

Poor directivity geometry, large distance given the amount of rupture between the fault and site

Directivity parameters:

X = 0.5
s = 4.99 km
θ = 67.6

Y = 0.03
d = 0.19 km
φ = 8.6

IDP = 0.05
Rowshandel parameter = -0.15