2010 Darfield, New Zealand, RHSC

Ground motion information:

NGA Record Sequence Number 6960

Magnitude = 7
Closest Distance = 13.6 km
Hypocentral Distance = 43.84 km
Vs30 = 270 m/s
Mechanism = Strike slip

T_p = 9.39 s
PGV = 63.8 cm/s

Orientation of strongest pulse, relative to north = 356 degrees
Orientation of strongest pulse, relative to fault parallel = 90 degrees
Pulse in fault normal direction = 1
Pulse due to directivity = 1

Comments:

Maybe soft soil, but no Vs30 provided in flatfile. See Bradley (2012) for more details about this earthquake.

Directivity parameters:

X = 0.55
s = 29 km
θ = 6.8

Y = 0.46
d = 11 km
φ = 17.1

IDP = 3.21
Rowshandel parameter = 0.61