2011 Christchurch, New Zealand, REHS

Ground motion information:

NGA Record Sequence Number 8123

Magnitude = 6.1
Closest Distance = 5.1 km
Hypocentral Distance = 9.69 km
Vs30 = 275 m/s
Mechanism = Reverse-oblique

T_p = 1.55 s
PGV = 97.5 cm/s

Orientation of strongest pulse, relative to north = 71 degrees
Orientation of strongest pulse, relative to fault parallel = 12 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 1

Comments:

Directivity effects were most clearly seen in the fault parallel orientation for this earthquake. See Bradley and Cubrinovski(2011) for more details about this earthquake.

Directivity parameters:

X = 0.14
s = 1 km
θ = 74.86

Y = 0.6
d = 5.97 km
φ = 27.76

IDP = Unknown
φ = Unknown