I guess this is lateral / torsional style buckling, but this afternoon I was biking from the train station to home. During the ride, I hit the small curb between the street and sidewalk and bam, my bikes seat post failed.
Right now I have three bikes that I use almost daily, during the past year all three have had problems. Typically flat rear tires or chain falls off, but this is the first bike to became a victim of fatigue. This happen half way home, I had to finish biking standing up on the peddles. I like to think it's because these bikes were designed for the Japanese market, not for someone like me.
Here is a reflection of the bike back before buckling began.
I will have to stop by my local bike repair guy, see if he can swap this post for a new one.