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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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3.7

10 km W of Boonville, CA

26 September 2026, 06:42:49 (+03) 2026-09-26 03:42:49 UTC

2 sources: EMSC, USGS mw
Did you feel this earthquake?
Magnitude
3.7 mw
Depth
4.8 km
Coordinates
39.0145, -123.4773
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
1
Last 7 days
6
Last 30 days
34

Approximate energy released

≈ 5.4 t TNT

2.24e+10 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): 4,3 Felt reports: 127 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

39 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 36
  • M3 2
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 36
  • 10–20 km 2
  • 20–40 km 1
  • 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).

No records.

Comparison with past records

…

No earlier earthquakes are recorded in this area.

  • Source:

Where does this earthquake come from?

Source comparison

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
NORTHERN CALIFORNIA
 3.5 mw 4.8 km 03:42:49.670 Δt 0 sn · 0 km · ΔM -0.2 Original record
USGS Earthquake Hazards Program Displayed
10 km W of Boonville, CA
 3.7 mw 4.8 km 03:42:49.670 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. 26.09.2026 13:36:21 · USGS · update

    depth: 4 → 4.78 latitude: 39.01083 → 39.0145 longitude: -123.48417 → -123.47733 time: 2026-09-26T03:42:49.570+00:00 → 2026-09-26T03:42:49.670+00:00

  2. 26.09.2026 13:36:21 · SISTEM · recompute

    depth: 4 → 4.78 latitude: 39.01083 → 39.0145 longitude: -123.48417 → -123.47733 time: 2026-09-26T03:42:49.570Z → 2026-09-26 03:42:49.670+00:00

  3. 26.09.2026 13:36:20 · EMSC · update

    depth: 4 → 4.8 latitude: 39.0108 → 39.0145 longitude: -123.4842 → -123.4773 time: 2026-09-26T03:42:49.570+00:00 → 2026-09-26T03:42:49.670+00:00

  4. 26.09.2026 06:55:28 · USGS · update

    magnitude type: ml → mw

  5. 26.09.2026 06:55:28 · SISTEM · recompute

    magnitude type: ml → mw

  6. 26.09.2026 06:55:27 · EMSC · update

    depth: 10 → 4 latitude: 39.0117 → 39.0108 longitude: -123.5017 → -123.4842 time: 2026-09-26T03:42:48.944+00:00 → 2026-09-26T03:42:49.570+00:00 magnitude type: ml → mw

  7. 26.09.2026 06:51:15 · USGS · update

    review status: automatic → reviewed

  8. 26.09.2026 06:51:15 · SISTEM · recompute

    depth: 10 → 4 latitude: 39.0117 → 39.01083 longitude: -123.5017 → -123.48417 magnitude: 3.5 → 3.7 time: 2026-09-26T03:42:48.944Z → 2026-09-26 03:42:49.570+00:00 review status: automatic → reviewed preferred source: 3 → 4

  9. 26.09.2026 06:50:10 · EMSC · update

    depth: 4 → 10 latitude: 39.0108 → 39.0117 longitude: -123.4842 → -123.5017 magnitude: 3.7 → 3.5 time: 2026-09-26T03:42:49.570+00:00 → 2026-09-26T03:42:48.944+00:00

  10. 26.09.2026 06:50:10 · SISTEM · recompute

    depth: 4 → 10 latitude: 39.0108 → 39.0117 longitude: -123.4842 → -123.5017 magnitude: 3.7 → 3.5 time: 2026-09-26T03:42:49.570Z → 2026-09-26 03:42:48.944+00:00

  11. 26.09.2026 06:45:54 · USGS · update

    depth: 9 → 4 latitude: 39.0091 → 39.01083 longitude: -123.471 → -123.48417 magnitude: 3.9 → 3.7 time: 2026-09-26T03:42:49.000+00:00 → 2026-09-26T03:42:49.570+00:00 location: 6 km SSW of Philo, California → 10 km W of Boonville, CA magnitude type: mw → ml

  12. 26.09.2026 06:45:53 · SISTEM · recompute

    depth: 9 → 4 latitude: 39.0091 → 39.0108 longitude: -123.471 → -123.4842 magnitude: 3.9 → 3.7 time: 2026-09-26T03:42:49.000Z → 2026-09-26 03:42:49.570+00:00 source count: 1 → 2 magnitude type: mw → ml confirming sources: usgs → emsc,usgs preferred source: 4 → 3

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