M 5.0 Earthquake Strikes 299 km W of Neiafu, Tonga
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A magnitude 5.0 mb earthquake occurred 299 km west of Neiafu, Tonga, at a depth of 367.8 km.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on July 11, 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
A magnitude 5.0 mb earthquake struck 299 km W of Neiafu, Tonga, on 2026-07-09 at 12:34:55 UTC. The event was recorded at coordinates 18.2136°S, 176.783°W with a depth of 367.793 km.
Location Details
The earthquake was located 299 km west of Neiafu, Tonga, at latitude -18.2136 and longitude -176.783. At 367.793 km depth, this is classified as a deep earthquake (greater than 70 km).
Impact Assessment
No felt reports were recorded. There was no tsunami advisory (tsunami field value: 0) and no alert level assigned.
What You Should Know
This was a moderate earthquake. Deep events like this are typically felt over a wide area but often cause limited damage at the surface.
Source
Data from USGS: https://earthquake.usgs.gov/earthquakes/eventpage/us7000szmb
Original source: USGS Official Notice ↗
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