In response to your post, I sent an e-mail to Dr. Kate Hutton at the Pasadena labs.
Here is her reply.

Try:
http://www.eqe.com/revamp/puente.htm
http://www.news.harvard.edu/gazette/1999/03.04/earthquake.html
http://www.proprisk.com/refcentr/puente.htm
http://pr.caltech.edu/media/lead/040798SIEH.html

I cheated. I searched for "Puente Hills fault" and "Whittier Narrows
earthquake" on yahoo.com. There is tons of material. The EQE stuff seems to be

the most comprehensive, but there are also abstacts and papers ...

Kate