2011 Christchurch, New Zealand, CMHS

Ground motion information:

NGA Record Sequence Number 8067

Magnitude = 6.1
Closest Distance = 4.5 km
Hypocentral Distance = 8.75 km
Vs30 = 275 m/s
Mechanism = Reverse-oblique

T_p = 2.04 s
PGV = 48.1 cm/s

Orientation of strongest pulse, relative to north = 21 degrees
Orientation of strongest pulse, relative to fault parallel = 38 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 0

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 = 34.68

Y = 0.6
d = 5.97 km
φ = 8.15

IDP = Unknown
φ = Unknown