M2.1 Earthquake 12 km SE of Middletown, CA — November 21, 2023
2023-11-21 18:13:07 UTC (2023-11-21) · approx. 10:13 AM UTC-8 local
On November 21, 2023 at 18:13 UTC, a magnitude 2.1 shallow crustal earthquake struck 12 km SE of Middletown, CA, at a depth of 5.9 km and coordinates 38.6890°, -122.5018°.
Physical scale: An earthquake of magnitude 2.1 releases seismic energy equivalent to roughly 23.6 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 18 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response 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
-122.5018°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.1 earthquake near Middletown, CA?
The magnitude 2.1 earthquake that struck 12 km SE of Middletown, CA on November 21, 2023 at 18:13 UTC had a depth of 5.9 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 2.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: nc73965371). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, November 21, 2023). M2.1 Earthquake 12 km SE of Middletown, CA — November 21, 2023. Retrieved November 22, 2023 from https://www.earthquaketracker.org/earthquakes/event/nc73965371/