M6.9 Earthquake 75 km W of Pangai, Tonga — August 25, 2024
2024-08-25 23:29:07 UTC (2024-08-25) · approx. 11:29 AM UTC-12 local
Felt by 24 people across nearby locations. Maximum shaking intensity MMI 6.2 (very strong).
On August 25, 2024 at 23:29 UTC, a magnitude 6.9 intermediate depth earthquake struck 75 km W of Pangai, Tonga, at a depth of 96.0 km and coordinates -19.8125°, -175.0711°. The earthquake was reported felt by 24 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.2 (very strong). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 276 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 746, making it a moderate-impact event. The nearest populated place is Pangai (population 1,738).
Physical scale: An earthquake of magnitude 6.9 releases seismic energy equivalent to roughly 338 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 35 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Tonga, a region characterized by the Tonga-Kermadec subduction zone, where the Pacific Plate descends at up to 240 mm per year — the fastest plate convergence on Earth. The nearest mapped fault system is the Tonga Trench. View all earthquakes in Tonga.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 24 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 4 | light | 21,142 |
| MMI 5 | moderate | 81,126 |
| MMI 6 | strong | 5,273 |
Earthquake Details
-175.0711°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 6.9 earthquake near Pangai, Tonga?
The magnitude 6.9 earthquake that struck 75 km W of Pangai, Tonga on August 25, 2024 at 23:29 UTC had a depth of 96.0 km. It was felt by 24 people with maximum shaking intensity of MMI 6.2 (very strong). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at -19.8125°, -175.0711°, which is 75 km W of Pangai, Tonga. The nearest populated place is Pangai (population 1,738). View all earthquakes in Tonga.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 6.9 earthquakes can continue for weeks to months and gradually diminish over time.
Has Tonga had earthquakes this big before?
The largest recorded earthquake in Tonga was the M8.1 Tonga Trench earthquake of June 26, 1917. Today's magnitude 6.9 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000n9dt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, August 25, 2024). M6.9 Earthquake 75 km W of Pangai, Tonga — August 25, 2024. Retrieved November 2, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000n9dt/