Sky Quakes, Broken Gear, or Something Else.

[guyfriday]

There are a number of reports of earthquakes being registered as having a negative depth which would indicate that the epicenter is in the air. What I have right now is this (which i copied from my post over at ATS if it looks familiar to some):
2.7 quake 0.8km above ground USGS event, page 1 (abovetopsecret.com)

as of right now we have:
at 8:37 PDT a 1.2 over Big Bear California depth -0.4 Mi
at 2:12 PDT a 2.6 over Winthrop Washington depth -0.2 Mi
at 16:06 PDT on 9/12 over Kapowsin Washington depth -0.3 Mi
at 15:12 PDT on 9/12 over/at Milford Utah depth -0 Mi
at 12:39 PDT on 9/12 over Apple California depth -0.6 Mi
at 12:02 PDT on 9/12 over Mission Canada depth -0.4 Mi
at 11:13 PDT on 9/12 over Virginia City Montana depth -1.2 Mi
at 11:09 PDT on 9/12 over Bonadelle Ranchos-Madera Ranchos California depth -0.2 Mi
at 3:28 PDT on 9/12 over/at Alamo Nevada depth 0 Mi

That's all the possible in air or ground level quakes I'm showing for the past day or so. 

Can anyone figure out a link between these places, that would be great.

Any ideas or theories?