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Significant earthquake

This summarises a recorded earthquake only; it is not a warning or a prediction. Follow AFAD and the competent authorities for official statements and guidance.

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3.3

27 km WSW of Westley, CA

27 September 2026, 17:21:50 (+03) 2026-09-27 14:21:50 UTC

2 sources: EMSC, USGS mw
Did you feel this earthquake?
Magnitude
3.3 mw
Depth
2.4 km
Coordinates
37.4177, -121.4555
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
1
Last 7 days
6
Last 30 days
37

Approximate energy released

≈ 1.3 t TNT

5.62e+9 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

Did you feel this earthquake?

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Community reports

Based on voluntary reports from users; not an instrumental measurement or official intensity. For official information follow AFAD and Kandilli Observatory announcements.

Impact information reported by sources

  • USGS Earthquake Hazards Program Tsunami flag: No Maximum intensity (MMI): 3,6 Felt reports: 13 ShakeMap

These values are automatic products of the respective agency, not an assessment by this platform. For tsunami warnings follow the Kandilli Observatory Regional Earthquake-Tsunami Monitoring Center and AFAD.

Nearby places

No records.

Nearby faults (50 km)

No mapped fault within 50 km.

Last year, within 100 km

43 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 41
  • M3 2
  • M4 0
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 36
  • 10–20 km 7
  • 20–40 km 0
  • 40–70 km 0
  • 70–150 km 0
  • 150+ km 0

Largest previous earthquakes within 100 km

Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).

Comparison with past records

…

No earlier earthquakes are recorded in this area.

  • Source:

Where does this earthquake come from?

Source comparison

Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
NORTHERN CALIFORNIA
 3.2 mw 2.4 km 14:21:50.350 Δt 0 sn · 0 km · ΔM -0.1 Original record
USGS Earthquake Hazards Program Displayed
27 km WSW of Westley, CA
 3.3 mw 2.4 km 14:21:50.350 Δt 0 sn · 0 km · ΔM 0 Original record

This value summarises agreement between sources; it is not a measure of scientific accuracy. Euro-Mediterranean Seismological Centre (EMSC-CSEM) — CC BY 4.0 U.S. Geological Survey (USGS) Earthquake Hazards Program — Public domain (U.S. Government)

Revision history

  1. 27.09.2026 21:56:52 · USGS · update

    magnitude: 3.5 → 3.3 magnitude type: ml → mw

  2. 27.09.2026 21:56:52 · SISTEM · recompute

    magnitude: 3.5 → 3.3 magnitude type: ml → mw

  3. 27.09.2026 21:56:51 · EMSC · update

    depth: 5 → 2.4 latitude: 37.4404 → 37.4177 longitude: -121.4516 → -121.4555 magnitude: 3.4 → 3.2 time: 2026-09-27T14:21:49.878+00:00 → 2026-09-27T14:21:50.350+00:00 magnitude type: ml → mw

  4. 27.09.2026 17:43:37 · EMSC · update

    depth: 2.4 → 5 latitude: 37.4177 → 37.4404 longitude: -121.4555 → -121.4516 magnitude: 3.5 → 3.4 time: 2026-09-27T14:21:50.350+00:00 → 2026-09-27T14:21:49.878+00:00

  5. 27.09.2026 17:30:02 · USGS · update

    review status: automatic → reviewed

  6. 27.09.2026 17:30:02 · SISTEM · recompute

    depth: 2.4 → 2.41 latitude: 37.4177 → 37.41767 review status: automatic → reviewed preferred source: 3 → 4

  7. 27.09.2026 17:25:55 · SISTEM · recompute

    source count: 1 → 2 confirming sources: emsc → emsc,usgs

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