Magnitude 5.4 - moment magnitude (Mw)

Distance from Chino Hills, CA - 4 km (3 miles) WSW (240 degrees)
Diamond Bar, CA - 7 km (5 miles) SE (135 degrees)
Yorba Linda, CA - 8 km (5 miles) NNE (16 degrees)
Pomona, CA - 12 km (7 miles) S (184 degrees)
Los Angeles Civic Center, CA - 46 km (28 miles) ESE (104 degrees)

That was fun.