Huge EARTHQUAKE

[TomK]

Royall - there's no such thing as an earthquake occurring at a depth of -0.1 miles - it would mean the earthquake occurred above the surface (the surface being 0). However, determining the depth can be difficult and the error bars quite large. So, with an automated system, the error bar could be larger than the actual depth and the computer spits out -0.1. It's similar to a rounding error. Over time, you may see this get corrected by a human (if they have the time!).

PS. And yes, the closer to the surface the more likely you are to feel it.