|On the left the
predicted-to-observed ratios are compared.
The predictions were obtained using hard rock Green’s functions with
QTM site corrections. Circles,
squares and triangles represent quaternary, tertiary and Mesozoic sites
respectively. Open symbols indicate
under prediction and filled symbols indicate over prediction. The symbol size
is scaled to the ratio.
|On the right
significant improvement is observed.
In this case both hard and soft rock Green’s functions were used to
account for site variability. LA
Basin is still under predicted but much less so. It is interesting that the “rock” sites around the basin remain
significantly under predicted. This
may be due to unaccounted for regional structure effects, and may be improved
using numerically derived 3D