1989 Loma Prieta, Treasure Island

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 808

Magnitude = 6.9
Closest Distance = 77.4 km
Hypocentral Distance = 98.98 km
Vs30 = 155 m/s
Mechanism = Reverse-oblique

T_p = 2.08 s
PGV = 33.4 cm/s

Orientation of strongest pulse, relative to north = 67 degrees
Orientation of strongest pulse, relative to fault parallel = 61 degrees
Pulse in fault normal direction = 1
Pulse due to directivity = 0

Comments:

This is a soft soil site. Too far away to be directivity

Directivity parameters:

X = 0.5
s = 20.02 km
θ = 25.8

Y = 0.81
d = 14.53 km
φ = 47.6

IDP = 2.18
Rowshandel parameter = 0.11

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

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