When I felt richer, and was more inclined to warn people, I subscribed to this journal and made summaries. I knew about this study years ago, and I guess they finally published. This is why I am so psycho on using peak ground velocity (PGV) instead of acceleration, since it captures this amplification.
As mentioned politely, the building code is crap on this issue. They found PGV amplification of more than 10 times. The code is quite on this.
Since I don't warn people any more (bad for my depression), I'll just wait. :)