There are quakes, and there are quakes

The Original Skrip notes that there was a quake in Pomona and Chino Hills yesterday morning, although Skrip didn't feel it.

I didn't either. Of course, the quake was a 3.1. Details here.

Earthquake Details
Magnitude 3.1
Date-Time Tuesday, March 10, 2009 at 13:41:28 UTC
Tuesday, March 10, 2009 at 06:41:28 AM at epicenter

Location 33.978°N, 117.753°W
Depth 11.2 km (7.0 miles)
Region GREATER LOS ANGELES AREA, CALIFORNIA
Distances 3 km (2 miles) W (276°) from Chino Hills, CA
7 km (4 miles) ESE (113°) from Diamond Bar, CA
7 km (4 miles) SW (233°) from Chino, CA
9 km (6 miles) S (178°) from Pomona, CA
46 km (29 miles) E (101°) from Los Angeles Civic Center, CA

Location Uncertainty horizontal +/- 0.2 km (0.1 miles); depth +/- 0.8 km (0.5 miles)
Parameters Nph=111, Dmin=7 km, Rmss=0.39 sec, Gp= 18°,
M-type=local magnitude (ML), Version=E
Source California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR

Event ID ci10380553