Here is an awesome video by a Christchurcher showing how the sediments pouring up through earthquake cracks have the perfect mixture of water and soil to be prone to liquefaction:
I spent a week clearing this crap out of people back yards with the student army of volunteers. They estimate 200000 tonnes of the silt had to be cleared.
http://www.youtube.com/watch?v=2WoKu5VxKgs
Here is an awesome video by a Christchurcher showing how the sediments pouring up through earthquake cracks have the perfect mixture of water and soil to be prone to liquefaction:
http://www.youtube.com/watch?v=1KqlAMWMjOE