Overview
- The U.S. Geological Survey logged a preliminary magnitude 3.6 quake centered near Alamo at 8:37 a.m. Sunday with an estimated depth of about 9 miles.
- Local media and officials report no injuries or major structural damage so far.
- Seismologists and emergency agencies say the initial data are provisional and remain on alert for aftershocks as they analyze more readings.
- Coverage of the event has been accompanied by Bay Area fault maps and guidance on earthquake preparedness for residents.
- This quake follows a June 2 cluster of offshore temblors, including a roughly magnitude 5.7 event, that prompted monitoring but produced no tsunami or major damage.