Recent Activity
On October 30, 2007 at 20:04 Pacific time, a magnitude 5.6 earthquake struck the adjacent Calaveras Fault in Alum Rock Park near San Jose, close to where the Hayward Fault diverges from it. The effects of an earthquake of this size include the spilling of merchandise from store shelves but little structural damage. An earthquake of this size can be locally terrifying and this particular event was also widely felt throughout Northern California and as far north as Oregon owing to the time of day, when most people were awake and sitting quietly in their homes. Minor aftershocks continued through Spring 2008.
Between late August and late September 2011, a string of small earthquakes ranging from magnitude 3.6 to 3.2 centered in southeast Oakland near the Oakland Zoo occurred with the majority of the shaking felt in San Leandro.
Over October and November 2011, a string of earthquakes ranging from magnitude 3.0 to 4.0 occurred on the Hayward Fault, centered near the UC-Berkeley campus. A magnitude 4.0 earthquake occurred on the Hayward Fault on October 20, 2011 at 14:41. This earthquake was centered in southeast Berkeley with an epicenter close to Memorial Stadium. This was followed by less energetic but deeper and more strongly felt 3.8 event at 20:16, with an epicenter 0.9 mile (1.5 km) further south. Owing to the depths of the epicenters these moderate quakes were felt over a wide region, including the nine Bay Area counties. One week later, a magnitude 3.6 earthquake occurred near to Berkeley on October 27, 2011; however, since this happened at 05:36 in the early morning it was less widely observed. On November 5, 2011, a magnitude 3.1 earthquake occurred, centered in Piedmont.
In September 2003, an earthquake of similar magnitude to those of October 2011 occurred near Piedmont, close to Berkeley.
On March 5, 2012 a closely spaced pair of earthquakes, magnitude 4.0, occurred near El Cerrito.
Read more about this topic: Hayward Fault Zone
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—Ralph Waldo Emerson (1803–1882)