Residents of Berkeley, Oakland, and Emeryville were gently bothered by a 3.0 earthquake that struck Wednesday afternoon at 3:34pm PDT. The quake struck the Hayward Fault, which by itself is a rather common occurrence, but in a an unusual turn of events, this particular quake was followed by a series of 7 smaller aftershocks, the last one registering a 1.8 at around 6:07pm PDT.
Here’s the series from the USGS:
Mag Date (UTC) Lat. Long. Location
We here at Science4Grownups felt the initial quake (actually heard it more than felt it), but I’m reluctant to claim I felt any of the aftershocks.
These slips are a good thing for 2 reasons:
- Each quake releases a little bit of stress on the Hayward, and making a big earthquake a little less likely for now.
- These Hayward quakes are reminders that the day will come that the Hayward will produce a substantial earthquake, and we best be ready.
Update: Another aftershock was recorded at 9:36pm PDT last night:
1.5 2009/05/13 21:36:49 37.866N 122.229W 11.2 4 km ( 3 mi) E of Berkeley, CA