In my humble opinion, peak ground velocity (PGV) is the only engineering parameter worth anything. Peak ground acceleration is just to mucky, and never correlates with damage. Lucky for me, the Taiwanese agree, and plot pgv right away. These are beautiful pulses of 60 cm/s, more than enough to take down buildings, but not those on deep piles to refusal.
The pgv gets long and rumbly on the basins.
The pga plots are pure fuzz. This was a clean, thrust earthquake, exactly what I expect in Oklahoma.
Appendix
5 cm/s - kills people in stone rubble houses
40 cm/s - tilts cheap condos by a few inches
50 cm/s - structural damage to houses
60 cm/s - tilts cheap condos by several feet, collapse 70's concrete buildings
80 cm/s - puts condos on their side, total destruction of old building stock
100-200 cm/s (m7-8 thrust) - Good Luck!
No comments:
Post a Comment