Calamity
LowEarthquakesCS: 12 · v5

Earthquakes near Brentwood

United StatesUSGS

Right now

The most recent data we hold from USGS arrived 12 minutes ago, and this point is in it.

Nothing else has been detected within 20 km in the last 24 hours.

Reported by USGS today.

No stronger detection stands among the 7 recorded within 20 km of this point since 8 March 2026 — 2 others scored the same. The last comparable one was on 13 September 2026. 2 more were recorded here in the fortnight before it.

What the source measured

USGS reported: 9 km SW of Brentwood, CA

USGS recorded magnitude 3.0 at a depth of 17 km.

Urban PEI: 20,444 within a heuristic 15 km radius; not unique people.

Nearby, since 8 March 2026

How we know

One source: USGS. Not yet confirmed by a second, independent source.

Our own score for this event is 12 out of 100.

This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.

Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.

Event Data

TypeEarthquakes
SeverityLow
Calamity Score (ours)12 / 100
Legacy data-support index0.83/1
Coordinates37.8748, -121.8098
Nearest CityBrentwood (11 km)
Urban exposure index (PEI)20.4K within 15 km
Impact Tierminor
Timestamp2026-09-14T13:47:28.320Z
Sourcehttps://earthquake.usgs.gov/earthquakes/eventpage/nc75435557

Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.

Source and revision timeline

Source: usgs. Occurrence: 2026-09-14T13:47:28.320Z.

First archived: 2026-09-14T13:56:32.545Z. Material modification: not recorded.

Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.

  1. 2026-09-14T22:26:24.936Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  2. 2026-09-14T22:10:22.876Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  3. 2026-09-14T20:39:23.849Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  4. 2026-09-14T20:28:43.006Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  5. 2026-09-14T19:40:31.929Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  6. 2026-09-14T19:08:41.409Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  7. 2026-09-14T18:53:32.465Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  8. 2026-09-14T18:37:28.070Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  9. 2026-09-14T18:32:08.766Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  10. 2026-09-14T18:16:13.277Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  11. 2026-09-14T18:05:39.519Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  12. 2026-09-14T17:45:00.910Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  13. 2026-09-14T17:23:48.163Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  14. 2026-09-14T17:13:10.425Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  15. 2026-09-14T16:45:58.832Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  16. 2026-09-14T16:40:41.170Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  17. 2026-09-14T16:24:43.430Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  18. 2026-09-14T16:08:41.168Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  19. 2026-09-14T15:36:57.724Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

  20. 2026-09-14T15:28:58.904Z · data_change

    Index 12 → 12; severity low → low; version 5 → 5.

Score Breakdown

0
intensity
40
Urban PEI term
0
Scenario weight
0
Recorded reference / batch anomaly

Technical Details

Mag2.99
Depth16.92
Tsunamifalse
Felt47
Sig151
Usgs Dyfi Mag2.99
Usgs Dyfi Depth16.92
Usgs Dyfi Felt47
Usgs Dyfi Cdi2.9
Usgs Dyfi CdiDescriptionWeak
Usgs Dyfi Sig151
Usgs Dyfi Tsunamifalse
Usgs Dyfi Place9 km SW of Brentwood, CA
Usgs Dyfi Types,dyfi,focal-mechanism,nearby-cities,origin,phase-data,scitech-link,
MergedSources[{"id":"usgs_dyfi_nc75435557","source":"usgs_dyfi","severity":"low","severityValue":17.94,"timestamp":1789393648320,"latitude":37.8748321533203,"longitude":-121.809829711914}]

Safety Information

If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.

Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.

This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.

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