Light 4.3 Earthquake Near Hihifo, Tonga
A light magnitude 4.3 earthquake struck 206 km WSW of Hihifo, Tonga on Saturday, August 29, 2026 at 12:09:58 AM UTC. This deep-focus event (330.3 km depth) released energy equivalent to approximately 43 tons of TNT. Here is the verified US telemetry, live epicenter map, and ground shaking assessment.
(206 km WSW of)Seismic Telemetry Specifications
4.3MB
Light Seismic Class
330.3km
Deep Mantle
16.662° S, 175.589° W
GPS Coordinates
43 tons
TNT Equivalent Power
US
USGS Real-time Feed
Epicenter Location & Tectonic Fault Map
Is This Earthquake Dangerous?
A magnitude 4.3 event is classified as a light earthquake. Noticeable shaking of indoor objects and rattling doors/windows. Generally causes none to slight non-structural damage in older buildings.
Estimated Shaking Across Nearby Communities
Felt by almost no one except under extraordinarily favorable conditions.
Did You Feel This Earthquake?
Help seismologists and community members map real-world ground shaking near Tonga.
Your immediate response verifies shaking boundaries and helps ground-truth instrumental models.
What Does Magnitude 4.3 Mean?
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Logarithmic Energy Multiplier
Because seismic scales are logarithmic, each whole integer increase represents:
Why Did This Earthquake Happen?
Tonga's seismicity is fundamentally governed by its tectonic setting: Pacific Plate subducting westward beneath the Indo-Australian Plate along the Tonga Trench at one of Earth fastest convergence rates (>20 cm/year). Major regional fault structures include Tonga Trench Megathrust, Lau Basin Spreading Center.
Originating at a depth of 330.3 km (Deep Mantle Transition Zone (>300 km)), this rupture occurred generated deep within earth's mantle under immense hydrostatic pressure. surface shaking is significantly damped despite large energy release.
Aftershock Outlook & Secondary Tremors
Seismologists note that minor aftershocks remain common in the 24 to 48 hours following tremors of magnitude 4.3. According to statistical seismic models, there is roughly a 5% probability of a subsequent event of equal or greater strength occurring in the same fault zone. Residents in Tonga are advised to check living spaces for unsecured items.
Never Miss Earthquake Updates on Google
Google Search FeatureAdd Earthquake Today as a Preferred Source in Google to see real-time seismic alerts, epicenter maps, and aftershock telemetry highlighted in Top Stories & AI Overviews.
Earthquake Safety Action Plan
Complete Safety Guide →- •Drop, Cover, and Hold On: Take cover beneath a sturdy table or desk.
- •Stay indoors away from exterior glass windows and heavy unanchored fixtures.
- •If outdoors, move into an open area away from power lines and building facades.
- •Inspect utilities for damaged gas lines, water leaks, or electrical hazards.
- •Expect Aftershocks: Secondary tremors frequently strike after significant events.
- •Avoid damaged structures and listen to official emergency broadcasts.
- •Maintain a 72-hour emergency go-bag with water, food, and first aid.
- •Anchor heavy furniture, water heaters, and appliances to structural studs.
- •Establish a family emergency communication protocol and meeting point.
Explore Related Seismic Activity
Monitor live earthquakes, historical magnitude leaders, and regional tectonic activity across the globe.