2010 Darfield, New Zealand, GDLC

Ground motion information:

NGA Record Sequence Number 6906

Magnitude = 7
Closest Distance = 1.2 km
Hypocentral Distance = 11.76 km
Vs30 = 275 m/s
Mechanism = Strike slip

T_p = 6.23 s
PGV = 128.5 cm/s

Orientation of strongest pulse, relative to north = 295 degrees
Orientation of strongest pulse, relative to fault parallel = 30 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 1

Comments:

Fault complexity near this location makes determination of the fault-normal direction non-obvious. Liquefaction occured after a few seconds of strong shaking. See Bradley (2012) for more details about this earthquake.

Directivity parameters:

X = 0.07
s = 3.49 km
θ = 37.9

Y = 0.46
d = 11 km
φ = 6.2

IDP = 0.74
Rowshandel parameter = 0.61