M2.2 Earthquake 3km NNE of San Leandro, CA — April 1, 2023
2023-04-01 17:02:46 UTC (2023-04-01) · approx. 9:02 AM UTC-8 local
Felt by 19 people across nearby locations.
On April 1, 2023 at 17:02 UTC, a magnitude 2.2 shallow crustal earthquake struck 3km NNE of San Leandro, CA, at a depth of 7.3 km and coordinates 37.7515°, -122.1420°. This earthquake was detected by 105 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 81, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 2.2 releases seismic energy equivalent to roughly 29.1 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 20 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in California, a region characterized by the San Andreas transform fault system, where the Pacific and North American plates slide past each other at roughly 46 mm per year. The nearest mapped fault system is the San Andreas Fault. View all earthquakes in California.
Learn more: San Andreas Fault · Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 19 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-122.1420°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.2 earthquake near San Leandro, CA?
The magnitude 2.2 earthquake that struck 3km NNE of San Leandro, CA on April 1, 2023 at 17:02 UTC had a depth of 7.3 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 37.7515°, -122.1420°, which is 3km NNE of San Leandro, CA. View all earthquakes in California.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.2 earthquakes can continue for several days and gradually diminish over time.
Has California had earthquakes this big before?
The largest recorded earthquake in California was the M7.9 Fort Tejon earthquake of January 9, 1857. Today's magnitude 2.2 event is significantly smaller than that historical record.
Actions
Authoritative source: USGS event page (event ID: nc73865520). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 1, 2023). M2.2 Earthquake 3km NNE of San Leandro, CA — April 1, 2023. Retrieved April 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/nc73865520/