It's kind of mind blowing that a building of this magnitude would go in a location that is bay fill in a region renowned for earthquakes, yet not have pilings going down to bedrock.
The real aftershocks are going to be the lawsuits over this.
The real aftershocks are going to be the lawsuits over this.
On a different note, a settlement (even differential) in excess of one foot is expected for a significant fraction of building stock in SF in the event of a "design-level" earthquake.
The tower is reportedly 6" out of plumb. Over its 600ft height, that's 0.08%. For perspective, it is generally accepted that construction tolerances will result in a building 1/500, or 0.2%, out of plumb at the time of erection.
Wikipedia has more information and some good photos: https://en.wikipedia.org/wiki/Soil_liquefaction
It's a really cool and equally terrifying phenomenon if you're used to thinking of the ground as a solid object. Plenty of videos on YouTube as well.
EDIT- Here's a car that sunk into the ground, which then resolidified around it: https://youtu.be/2WoKu5VxKgs?t=50
http://izismile.com/2012/08/31/christchurch_liquefaction_26_...