BSSA 104:5, Electronic Supplement to Shahi & Baker - Pulse Details: 1989 Loma Prieta, Saratoga

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 802

Magnitude = 6.9
Closest Distance = 8.5 km
Hypocentral Distance = 32.35 km
Vs30 = 387 m/s
Mechanism = Reverse-oblique

T_p = 4.57 s
PGV = 53.5 cm/s

Orientation of strongest pulse, relative to north = 70 degrees
Orientation of strongest pulse, relative to fault parallel = 58 degrees
Pulse in fault normal direction = 0
Pulse due to directivity = 1

Comments:

no comment

Directivity parameters:

X = 0.5
s = 20.02 km
θ = 23.2

Y = 0.81
d = 14.53 km
φ = 11.5

IDP = 2.9
Rowshandel parameter = 0.16

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