|
|
|
We use a
standard methodology in which regional distance ground motions recorded on
very broadband instruments are inverted for slip following the representation
theorem for an elastic dislocation.
We use a variety of simplifying assumptions including constant rupture
velocity and dislocation rise time.
We further apply slip positivity, seismic moment minimization and
smoothing constraints to provide stability to the inversion.
|
|
|
|
The simulation
of near-source strong ground motions in our methodology involves either:
|
|
1. The application of a directivity capable
attenuation relationship such as that determined by Somerville et al. (1997)
|
|
|
|
2. Or solves the forward problem (above)
using Green’s functions appropriate for the near-source region and the regionally derived fault slip map.
|
|
|
|
We will show
that a combination of 1 & 2 to produce a source specific conservative map
(largest value of the two methods) produces reasonable ground motions and is
found to work well when integrated with observed strong motion values
|