1992 Joshua Tree, CA , Indio

Plots of original ground motion, extracted pulse, and residual ground motion:

Map of epicenter, rupture extent and station location:

Ground motion information:

NGA Record Sequence Number 6877

Magnitude = 6.1
Closest Distance = 25.5 km
Hypocentral Distance = 28.39 km
Vs30 = 306 m/s
Mechanism = Strike slip

T_p = 1.1 s
PGV = 53.3 cm/s

Orientation of strongest pulse, relative to north = 268 degrees
Orientation of strongest pulse, relative to fault parallel = 72 degrees
Pulse in fault normal direction = 1
Pulse due to directivity = 0

Comments:

Large distance and not directivity geometry. Pulse came late.

Directivity parameters:

X = 0.06
s = 0.5 km
θ = 1.3

Y = 0.7
d = 7.4 km
φ = 2.7

IDP = 0.39
Rowshandel parameter = -0.71

Notes:

These results were computed November 1st, 2012
These results are based on the June 2012 version of the NGA West 2 database
If you have any observations, comments or requests regarding this data, please e-mail Jack Baker and Shrey Shahi