Shallow M6.4 earthquake hits Pacific-Antarctic Ridge, South Pacific Ocean
A strong and shallow earthquake registered by the USGS as M6.4 hit the Pacific-Antarctic Ridge at 04:57 UTC on August 3, 2025. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting the same magnitude and depth.
Epicenter of M6.4 earthquake on Pacific-Antarctic Ridge, South Pacific Ocean on August 3, 2025. Credit: TW/SAM, Google
The epicenter was located 3 440 km (2 137 miles) SW of Hanga Roa, Valparaiso, Chile, and 3 545 km (2 200 miles) E of Waitangi, Chatham Islands, New Zealand.
There is no tsunami threat from this earthquake.
The USGS issued a Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
There are likely to be no affected structures in this region.
The quake was preceded by an M5.2 at 02:26 UTC today.
Estimated population exposure to earthquake shaking
Regional seismicity
References:
1 M6.4 earthquake Pacific-Antarctic Ridge – USGS – August 3, 2025
2 M6.4 earthquake Pacific-Antarctic Ridge – EMSC – August 3, 2025
I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.
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