Earthquakes 216 km WSW of Adak, Alaska — Light shaking (MMI 4.8)
Right now
Nothing else has been detected within 20 km in the last 24 hours.
Reported by USGS 149 days ago.
It is the 5th strongest of the 13 detections recorded within 20 km of this point since 18 March 2026. The last comparable one was on 18 March 2026.
What the source measured
USGS reported: 216 km WSW of Adak, Alaska — Light shaking (MMI 4.8)
USGS recorded magnitude 5.0 at a depth of 35 km.
Nearby, since 18 March 2026
- June 23, 2026 · score 0 · 2.5 km
- June 23, 2026 · score 0 · 8.6 km
- June 18, 2026 · score 16 · 9.9 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Medium |
| Calamity Score (ours) | 9 / 100 |
| Legacy data-support index | 0.50/1 |
| Coordinates | 51.4200, -179.6701 |
| Nearest City | Petropavlovsk-Kamchatsky (1483 km) |
| Urban exposure index (PEI) | 0 within 20 km |
| Impact Tier | minor |
| Timestamp | 2026-04-18T13:15:09.117Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/us6000sr43/shakemap |
Physical priority index · v1. 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_shakemap. Occurrence: 2026-04-18T13:15:09.117Z.
First archived: 2026-04-18T23:16:13.358Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Mag | 5 |
| Depth | 35 |
| Mmi | 4.78 |
| MmiDescription | Light |
| Sig | 385 |
| Tsunami | false |
| Place | 216 km WSW of Adak, Alaska |
| Types | ,event-sequence,oaf,origin,phase-data,shakemap, |
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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