I was awakened by shaking at 4:04 am this morning. It was a moderate earthquake, Richter magnitude 4.4. The epicenter was one mile north of Pico Rivera, California, 11 miles southeast of downtown Los Angeles, along the Whittier fault, where there was a 5.9 quake in 1987. This quake must have relieved some built-up stress along that fault, which is good. At the epicenter people reported a jolt and about 20 seconds of rolling. I felt the rolling and heard some far away noise, perhaps dogs barking. A 4.4 quake isn't big enough to cause much damage or injury, although there are reports of things falling off shelves. It's equivalent to the total energy of an average tornado or 5100 tons of TNT, but it's over a wide enough area to disperse most of that energy. The best news: our Macs are fine!