If the roof designer spent more than a nanosecond trying to regain some of the rigidity lost by cutting the roof off then yes. The ceiling is already ~8ft with the stock roof so there's plenty of space for bracing. In stock form you can roll an empty one over and not hurt it much.

If you're in an earthquake, you don't want your house to roll over.... I'm assuming the container is attached to a foundation to prevent movement. If you are worried about an earthquake, bodily injury from glass windows breaking is probably your biggest concern.

Shipping containers are designed for stacking on ships, which can have quite a bit of movement when at sea. If you engineer the house correctly, it's not a problem. I'd be much more concerned about living in a soft story residence than a container.