Interactive U.S. Geological Survey map showing location of Sunday's Concord quakes. Click on dots for quake details.
Update, 10 p.m.: The U.S. Geological Survey has reported two more small shocks in the same area as this afternoon's earthquake: a 2.3 tremor at 5:54 p.m. and a 1.5 shakelet at 8:30 p.m. That's a total of eight small quakes in a Concord neighborhood southeast of Buchanan Field since the first one at 7:15 this morning.
Update, 6 p.m.: The U.S. Geological Survey has revised downward its report on this afternoon's quakes on the Concord Fault, now saying the largest in the series of five shakes was 3.6 instead of 4.0.
Original post: We'll admit right off, from KQED Weekend Blog Central in beautiful Berkeley, that we did not feel the
4.03.6-magnitude quake that shook parts of the Bay Area at 3:13 p.m. Sunday. Neither did we feel the 2.7 mini-temblor a minute later.
Nor the three other episodes of trembling earth the U.S. Geological Survey reports happened between 3 p.m. and 4 p.m. All five shakes were centered in a tight cluster a mile and a half or so southeast of Concord's Buchanan Field airport.