Version 1.0 of the Preliminary Soil-Slip Susceptibility Maps,
Southwestern California comprises seven ARC/INFO grids, la_sus,
lb_sus, ocs_sus, sbern_sus, sd_sus, sa_sus, sbarb_sus, which
contain soil-slip susceptibility values.
> Grid name   Quadrangle name
> la_sus      Los Angeles
> lb_sus      Long Beach
> ocs_sus     Oceanside
> sbern_sus   San Bernardino
> sd_sus      San Diego and El Cajon
> sa_sus      Santa Ana
> sbarb_sus   Santa Barbara
The item names and definitions are the same for each raster
data set and are as follows:
>*_sus.vat
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  VALUE                  4    10     B      -
>    5  COUNT                  4    10     B      -
>    9  SUSCODE                8     8     N      3
>
>
>*_sus.sta
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  MIN                    8    15     F      3
>    9  MAX                    8    15     F      3
>   17  MEAN                   8    15     F      3
>   25  STDV                   8    15     F      3
The item suscode contains the susceptibility values.

http://pubs.usgs.gov/of/2003/0017/pdf/of03-17.pdf

Susceptibility values identified in each of the seven mapped areas (the Santa Barbara 100K sheet, the Los Angeles 100K sheet, the south half of the San Bernardino 100K sheet, the Long Beach 100K sheet, the Santa Ana 100K sheet, the Oceanside 100K sheet, and the San Diego and western El Cajon 100K sheets)