The Great Depression had a few more things going for it, other than mere human foolishness. It had the Long Beach Earthquake of 1933, and the Dust Bowl.
As the article says, if there were to be a big earthquake in California, everybody would walk (hobble) away from their uninsured, mortgaged to the hilt, houses. This would require another Obama-trillion to clean up the mess! And the US-gov is mortgaged to the hilt!
So, no mortage-earthquakes for a while!