San Andreas Fault
I didn’t realise how close the San Andreas fault is to San Bernardino, it passes just through to the north so any major quake would have a massive impact here. According to this article, which itself is over a year old, it’s overdue for an erruption which could be similar to the magnitude 7.6 in Pakistan a year ago. Liquefaction could occur because of the underground aquifers and so the houses would all collapse. I thought I was safer this far from San Francisco!