M 5.5 Earthquake Occurs 154 km West of Neiafu, Tonga
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 5.5 earthquake struck 154 km west of Neiafu, Tonga, at a depth of 254.6 km, with one person reporting it was felt.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on April 13, 2026 and geographically references Tonga. 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, Tonga.
What Happened
An earthquake with a magnitude of 5.5 mww occurred on June 28, 2026, at 12:48:21 UTC, located 154 km west of Neiafu, Tonga. The event took place at a depth of 254.6 km.
Location Details
The earthquake was centered 154 km west of Neiafu, a town in Tonga, at coordinates 18.4052° S latitude and 175.4263° W longitude. With a depth of 254.6 km, this is considered a deep earthquake (greater than 70 km), which typically causes less intense shaking at the surface compared to shallower events.
Impact Assessment
One person reported feeling the earthquake. There is no tsunami advisory, and the alert level is green, indicating a low likelihood of significant impact.
What You Should Know
This moderate earthquake, with a magnitude of 5.5, can potentially cause damage to poorly constructed buildings in the affected area. Aftershocks are possible following such events, and general safety tips include staying informed through official channels and preparing an emergency plan if you are in a seismically active region like Tonga.
Source
Information sourced from the United States Geological Survey (USGS). For more details, visit: USGS Event Page
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 (1,253 characters here).
Similar severity timing
Same severity (medium) notices issued closest in time to April 13, 2026.
Frequently Asked Questions
Common questions about this USGS earthquake report.