Calamity
MediumEarthquakesCS: 9 · v5

Earthquakes 248 km SSE of False Pass, Alaska

USGS

Right now

The most recent data we hold from USGS arrived 2 hours ago, and this point is in it.

2 other detections within 20 km in the last 24 hours, the nearest 2 km from here.

Reported by USGS today.

It is one of only 3 we have recorded within 20 km of this point since 20 September 2026.

What the source measured

USGS reported: 248 km SSE of False Pass, Alaska

USGS recorded magnitude 5.0 at a depth of 10 km.

Nearby, since 20 September 2026

How we know

3 recorded sources include USGS; independence is not established by this count.

Our own score for this event is 9 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
SeverityMedium
Calamity Score (ours)9 / 100
Legacy data-support index0.70/1
Coordinates52.6966, -162.4693
Nearest CityAnchorage (1212 km)
Urban exposure index (PEI)0 within 70 km
Impact Tierminor
Timestamp2026-09-20T21:06:19.931Z
Sourcehttps://earthquake.usgs.gov/earthquakes/eventpage/us7000tit6

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: 2026-09-20T21:06:19.931Z.

First archived: 2026-09-20T22:16:00.082Z. Material modification: 2026-09-21T06:36:01.590Z.

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

  1. 2026-09-21T06:36:01.590Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  2. 2026-09-21T06:19:52.626Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  3. 2026-09-21T05:04:43.052Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  4. 2026-09-21T04:26:58.196Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  5. 2026-09-21T04:21:34.140Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  6. 2026-09-21T04:16:10.960Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  7. 2026-09-21T03:27:36.432Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  8. 2026-09-21T03:06:12.576Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  9. 2026-09-21T02:55:31.553Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  10. 2026-09-21T02:34:14.884Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  11. 2026-09-21T02:23:34.608Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  12. 2026-09-21T02:02:18.721Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  13. 2026-09-21T01:56:56.533Z · data_change

    Index 9 → 9; severity medium → medium; version 5 → 5.

  14. 2026-09-21T01:51:37.825Z · data_change

    Index 16 → 9; severity medium → medium; version 5 → 5.

  15. 2026-09-21T01:30:20.442Z · data_change

    Index 16 → 16; severity medium → medium; version 5 → 5.

  16. 2026-09-21T01:03:34.958Z · data_change

    Index 9 → 16; severity medium → medium; version 5 → 5.

Score Breakdown

20
intensity
0
Urban PEI term
0
Scenario weight
10
Recorded reference / batch anomaly

Technical Details

Mag5
Depth10
Tsunamifalse
Mmi2.23
Sig385
Emsc Mag5
Emsc Depth5.7
Emsc MagTypemb
Emsc RegionSOUTH OF ALASKA
Emsc AuthEMSC
Emsc SourceId2063033
Gfz Mag5.09
Gfz Depth10
Gfz MagTypemb
Gfz RegionSouth of Alaska
MergedSources[{"id":"emsc_20260920_0000264","source":"emsc","severity":"medium","severityValue":40,"timestamp":1789938379750,"latitude":52.6941,"longitude":-162.4764},{"id":"gfz_gfz2026smhp","source":"gfz","severity":"medium","severityValue":40.72,"timestamp":1789938381000,"latitude":52.644,"longitude":-162.48}]

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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