M 4.2 Earthquake — 35 felt reports
8 km NNE of Old Harbor, Alaska — 35 people reported feeling this earthquake — CDI 3.8 (Weak)
Geographic Context
This earthquake event occurred in United States, located in a region with varying seismic hazard profiles across different geological provinces.
Event Assessment
This event is an earthquake of magnitude 4.2 at 39 km depth. Calamity.live has classified it as "low" severity with a severity value of 25.200000000000003. The computed Calamity Score is 2 out of 100, suggesting contained impact at this time. The primary scoring components are: intensity (4), historical (2). Data for this event was sourced from usgs_dyfi, one of the 250 scientific monitoring sources aggregated by Calamity.live.
Regional Monitoring Context
United States has a documented history of earthquake events. Seismic monitoring in the region draws on data from multiple agencies including USGS, EMSC, and regional networks. Understanding local seismicity helps emergency management agencies plan for potential future events and assess building code adequacy. Earthquake hazard in any region depends on fault proximity, soil conditions, and building vulnerability — factors that can vary significantly even within a single metropolitan area.
Event Data
| Type | Earthquake |
| Severity | low |
| Severity Value | 25.200000000000003 |
| Calamity Score | 2 / 100 |
| Confidence | 50% |
| Coordinates | 57.2750, -153.2600 |
| Timestamp | 2026-04-23T07:12:55.378Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/aka2026hydrzg/dyfi |
Score Breakdown
Technical Details
| Mag | 4.2 |
| Depth | 39.3 |
| Felt | 35 |
| Cdi | 3.8 |
| CdiDescription | Weak |
| Mmi | 3.528 |
| Sig | 285 |
| Tsunami | false |
| Place | 8 km NNE of Old Harbor, Alaska |
| Types | ,dyfi,moment-tensor,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.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a earthquake event with CalamityScore 2/100 (United States), based on data from usgs_dyfi. Source: Calamity.live, a platform aggregating real-time data from 197 scientific monitoring sources.