M 5.4 Moderate Earthquake Strikes Near Attu Station, 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 shallow magnitude 5.4 earthquake occurred 222 km east-southeast of Attu Station, Alaska, on March 19, 2026, triggering a green alert level and a tsunami advisory flag.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on April 6, 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 moderate earthquake with a magnitude of 5.4 (mww) was recorded in the Aleutian Islands region on March 19, 2026, at 13:26:59 UTC (04:26:59 AM local time). The seismic event occurred at a shallow depth of 10 kilometers.
Location Details
The earthquake's epicenter was located at coordinates 52.2374°N and 176.3148°E, approximately 222 km east-southeast of Attu Station, Alaska. The depth of 10 km is classified as shallow; earthquakes occurring at depths of less than 20 km are typically felt more strongly at the surface than deeper events.
Impact Assessment
The United States Geological Survey (USGS) has issued a "green" alert level for this event, indicating a low likelihood of casualties and damage. The Modified Mercalli Intensity (MMI) was measured at 4.32. According to the source data, a tsunami advisory flag (status 1) was associated with this event. No individual felt reports have been officially recorded at this time.
What You Should Know
A magnitude 5.4 earthquake is considered a "moderate" event. While such earthquakes can cause damage to poorly constructed buildings, they typically result in light damage to well-built structures. Residents in the region should remain aware of the possibility of aftershocks, which are routine following an event of this size.
Source
Information and data provided by the USGS Earthquake Hazards Program.
Original source: USGS Official Notice ↗
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