M 4.3 Earthquake Occurs 57 km SW of Cantwell, Alaska
Areazine synthesizes this USGS earthquake report directly from USGS's official public data feed. See our methodology for full source attribution and refresh cadence.
A magnitude 4.3 earthquake struck 57 km southwest of Cantwell, Alaska, at a depth of 92.1 km, with the event occurring on June 23, 2026, at 10:00:11 UTC.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on April 28, 2026 and geographically references Alaska. Its severity classification of "medium" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Earthquakes - determines the monitoring protocol behind it, which shapes what follow-up action (checking for structural damage, watching for aftershocks, reviewing local building codes) is relevant and which agency holds authority over the assessment.
Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to verify its scope, source, and timestamp, then compare related notices without assuming that one record proves a broader trend.
Areazine pairs this record with the original agency URL so you can check the primary source before acting. Its related labels are earthquake, seismic, usgs, Alaska.
What Happened
A magnitude 4.3 ml earthquake occurred on June 23, 2026, at 10:00:11 UTC. The event took place 57 km SW of Cantwell, Alaska, at a depth of 92.1 km.
Location Details
The earthquake was centered at coordinates latitude 63.066 and longitude -149.833, specifically 57 km SW of Cantwell, Alaska. At a depth of 92.1 km, this qualifies as a deep earthquake, which typically occurs in the Earth's lower crust or upper mantle and may be less felt at the surface compared to shallower events.
Impact Assessment
The earthquake was reported as felt by 38 people, with a maximum intensity of 2.9 on the Community Decimal Intensity (CDI) scale, indicating weak shaking. There is no tsunami advisory, and no alert level was issued.
What You Should Know
This light earthquake, with a magnitude of 4.3, may cause noticeable shaking but rarely results in damage. It is possible for aftershocks to occur following such events; for safety, if shaking is felt, individuals should drop to the ground, cover their head and neck, and hold on until the shaking stops.
Source
Information sourced from the United States Geological Survey (USGS). For more details, visit: https://earthquake.usgs.gov/earthquakes/eventpage/aka2026ihbayw
Original source: USGS Official Notice ↗
Related Earthquakes
All Earthquakes →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this USGS earthquake report: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,320 characters here).
Similar severity timing
Same severity (medium) notices issued closest in time to April 28, 2026.
Frequently Asked Questions
Common questions about this USGS earthquake report.