Monday, February 16, 2009
Famous Earthquakes for Me: Chi-Chi 1999
This was my most favourite earthquake. It totally vindicated my passion for PGV and pooh-poohed PGA. Yet, all the old engineers still go with PGA, simply because of tradition. I can never figure that out.
Here are the great graphs! Taiwan is massively instrumented, and unlike Japan, they know how to calculate velocity from accelerations records! It turns out that serious housing damage only starts at 60 cm/s, and below 10 cm/s there is virtually no chance of damage.
The sad fact is that only I know that PGV on solid rock, under Darlington, can never exceed 10 cm/s. So where does that leave all the seismic engineers?