At 1:50 a.m. today there was a pretty big, 4.8M, shallow earthquake in Mexico. It looked like this on the helicordes at Lake FUBAR:
Here is what some other past events look like:
Lake FUBAR makes its own seismos
Something big at Lake FUBAR
VERY BIG, SHALLOW FAR AWAY EARTHQUAKE
FLUID MOVEMENT PLUS SEISMIC GRUMBLES
Fluid movement is the top red line.
CLICK ON IMAGE FOR FULL SIZE