2010 Darfield, New Zealand, TPLC

Ground motion information:

NGA Record Sequence Number 6975

Magnitude = 7
Closest Distance = 6.1 km
Hypocentral Distance = 36.47 km
Vs30 = 275 m/s
Mechanism = Strike slip

T_p = 8.93 s
PGV = 74.1 cm/s

Orientation of strongest pulse, relative to north = 354 degrees
Orientation of strongest pulse, relative to fault parallel = 89 degrees
Pulse in fault normal direction = 1
Pulse due to directivity = 1

Comments:

Soft soil or basin effect. See Bradley (2012) for more details about this earthquake.

Directivity parameters:

X = 0.55
s = 29 km
θ = 6.6

Y = 0.46
d = 11 km
φ = 12.4

IDP = 3.17
Rowshandel parameter = 0.61