Full Breakdown
East Bay Shakes: Preliminary 3.6 Magnitude Earthquake Near Alamo
6/9/2026, 2:39:39 AM
Earthquake Overview
A preliminary magnitude 3.6 earthquake struck the East Bay of California on Sunday morning. The U.S. Geological Survey (USGS) recorded the event at 8:37 a.m., with the epicenter located near the community of Alamo. The quake originated at a depth of nine miles beneath the surface. No injuries or major damage have been reported in the immediate aftermath. The USGS classified the event as a preliminary magnitude 3.6 earthquake.
Geological Setting of the East Bay
The East Bay lies within a region of the San Francisco Bay Area that contains several significant fault lines. USGS mapping tools display these faults alongside locations of historically strong earthquakes. The map provided by USGS highlights the spatial relationship between these fault lines and locations that have experienced strong shaking in previous earthquakes.
Public Awareness Tools
The USGS notice includes a prompt asking residents, “Did you feel it?” and provides a map that displays the significant fault lines across the San Francisco Bay Area along with locations of historically strong earthquakes. This visual aid enables individuals to compare their residence to known seismic features and assess personal exposure. The combination of the prompt and the map is intended to help residents determine whether they experienced the shaking and to locate themselves relative to known seismic hazards.
Event Data
- Date and Time: Sunday, 8:37 a.m. (local time)
- Epicenter: Near Alamo, California, East Bay
- Preliminary Magnitude: 3.6 (USGS)
- Depth: 9 miles (approximately 14.5 kilometers)
- Reported Consequences: No injuries; no major structural damage reported
These figures represent the core details released to the public and media.
Impact Assessment
The absence of reported injuries or significant damage indicates that the earthquake’s effects were limited in scope. The USGS reported the preliminary magnitude and location of the event. The reported depth of nine miles provides a measure of how far below the surface the rupture occurred.
Official Response
The USGS served as the primary source of information for the event, issuing a brief notice that confirmed the magnitude, time, depth, and location of the quake.
Historical Seismic Context
The map referenced in the report underscores that the East Bay sits within a broader tectonic environment that has experienced strong earthquakes in the past. The visual representation of past strong earthquakes on the map offers a reference for the frequency and distribution of significant seismic events in the region.
Data Sources and Reporting
The earthquake information originates from the United States Geological Survey, the federal agency tasked with detecting, cataloguing, and reporting seismic activity nationwide.
Outstanding Information
The current report does not include any conflicting accounts regarding the earthquake’s characteristics. No additional statements from local authorities, emergency services, or eyewitnesses have been provided in the source material. Consequently, the public record consists solely of the USGS’s preliminary notice.
