The 1989 Loma Prieta earthquake:
http://www.barcelonareporter.com/index. ... francisco/
http://en.wikipedia.org/wiki/1989_Loma_ ... earthquake
I remember watching the aftermath of this on our Television at the time, especially the crushed cars sandwiched between the two tiers of the Motorway!
Never to be forgotten!
...and it could happen again!
Paul... 8-)...!