I want to correct what I think is an error in the text here, perhaps even another myth that needs debunking. We are told to seek cover underneath a sturdy object, but it’s much, much better to seek cover NEXT TO a sturdy object. When the roof comes down, the sturdy object will be compressed with you under it, but it you are next to the sturdy object there is more likely to be a small space you that you can survive in until you either crawl out or rescue teams arrive.
I think the sturdy piece of furniture idea is to keep objects from falling on your head, and for that I’m sure it works quite well. However, if the building is in danger of coming down, please place yourself next to the sturdy object or better yet, just get outside fast. Here’s an article that seems to share the key concepts: http://www.globalofw.com/ofw-tips/earthquake-safety-and-survival-tips