1987 Whittier Narrows-01, Bell Gardens - Jaboneria

Ground motion information:

NGA Record Sequence Number 595

Magnitude = 6
Closest Distance = 17.8 km
Hypocentral Distance = 18.75 km
Vs30 = 309 m/s
Mechanism = Reverse-oblique

T_p = 0.82 s
PGV = 30 cm/s

Orientation of strongest pulse, relative to north = 133 degrees
Orientation of strongest pulse, relative to fault parallel = 33 degrees
Pulse in fault normal direction = 0
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 = 62.8

Y = 0.03
d = 0.19 km
φ = 24.4

IDP = 0.06
Rowshandel parameter = -0.16