Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #0: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.
A micro earthquake occurred at 6:55:44 PM (PDT) on Saturday, September 27, 2025.
The magnitude 1.7 event occurred 11 km (7 miles) E (82 degrees) of Blackhawk, CA.
The hypocentral depth is 14 km ( 8 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Saturday, September 27, 2025 at 6:55:44 PM (PDT) Sunday, September 28, 2025 at 1:55:44 (UTC) |
| Distance from |
Blackhawk, CA - 11 km (7 miles) E (82 degrees) Brentwood, CA - 12 km (7 miles) SSW (206 degrees) Byron, CA - 13 km (8 miles) WSW (254 degrees) Diablo, CA - 15 km (10 miles) E (90 degrees) Livermore, CA - 17 km (11 miles) N (355 degrees) |
| Coordinates | 37 deg. 50.0 min. N (37.834N), 121 deg. 47.0 min. W (121.784W) |
| Depth | 13.51 km (8.40 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=3.1 km, Rmss=0.07 sec, Erho=0.65 km, Erzz=1.11000001 km, Gp=105 degrees |
| Event ID# | nc75242807 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
[
Index map ||
Big earthquake list ||
All earthquake list ||
Glossary of terms ||
Top page
]
[
Did you feel it? ||
ShakeMaps
|| Relative2Me
]
[ Data Sources ]
Special maps
Long Valley || Los Angeles || San Francisco
Data Sources
US and World - USGS/NEIC = National Earthquake Information Center
Northern California - UCB = University of California, Berkeley
Southern California - Caltech = California Institute of Technology
Nevada - UNR = University of Nevada, Reno
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)
