Just a reminder, lots of small quakes are good! They prevent the one big snap that levels the city. I remember getting "earthquake swarms" on the Hayward fault back in San Ramon in the early '90s. At the time the Hayward fault was way over-due for a 7.0+ quake, but I think all the little 3.0-5.0 quakes (there were like 20 in a week or something crazy... it seems like one every 2 to 4 hours) must have released the tension, 'cause the big one never came.
'Course, these could just be pre-shocks. And the Hayward fault might still generate an 8.0 tomorrow. Earthquakes are unpredictable like that.
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