2011 Christchurch, New Zealand, CHHC

Ground motion information:

NGA Record Sequence Number 8066

Magnitude = 6.1
Closest Distance = 4.9 km
Hypocentral Distance = 9.49 km
Vs30 = 275 m/s
Mechanism = Reverse-oblique

T_p = 1.96 s
PGV = 81.3 cm/s

Orientation of strongest pulse, relative to north = 57 degrees
Orientation of strongest pulse, relative to fault parallel = 2 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 0

Comments:

Initial directivity pulse followed immediately by resonant shaking due to basin effects. 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 = 63.47

Y = 0.6
d = 5.97 km
φ = 24.63

IDP = Unknown
φ = Unknown