8.8 Kamchatka Earthquake Explained: The Tsunami That Crossed the Pacific
The strongest quake on Earth since 2011, a tsunami that crossed the whole Pacific, and volcanoes waking up days later. Nana Flint explains what happened off Kamchatka, and what a tsunami warning would mean for us.
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In Flint's words
Nana Flint here, from the Ground desk. On the morning of 30 July 2025, local time, the seafloor off Russia's Kamchatka Peninsula gave way. The US Geological Survey measured it at magnitude 8.8, the strongest earthquake anywhere since Japan in 2011. The shaking went on for about four and a half minutes. Put the kettle on, petal, and it still wouldn't have stopped.
What broke was a stretch of the deep trench where the Pacific plate dives under the plate Kamchatka sits on. The rupture ran about 600 kilometres, most of it tearing south-west down the Kuril Islands.
Then the water moved. Severo-Kurilsk took the worst of it, with the sea about 6.3 metres up and some 200 metres inland. The wave crossed the whole Pacific. Warnings went out within ten minutes, Japan advised close to two million people to evacuate, and Maui saw 1.74 metres. One life was lost, in Japan, while a woman was moving her car to higher ground.
Days later, Krasheninnikov volcano erupted for the first time since around 1550. Did the quake cause it? Maybe nudged it. A shove, not a spark.
For us on the Mid North Coast, learn the Bureau's words now. A Watch means stand by. A Warning means act, and for a land threat that's a kilometre inland or ten metres up.
Right. Who's checking the signs on our own coast point the right way?
Key facts
- Magnitude 8.8, about 35 km deep, at 11:24 am local time on 30 July 2025 (23:24 UTC on 29 July), the strongest earthquake worldwide since 2011.
- The rupture ran about 600 km long and 140 km wide, with up to 40 metres of slip in places.
- The Pacific Tsunami Warning Center sent its first warnings within ten minutes.
- Waves reached about 6.3 m at Severo-Kurilsk, 1.74 m at Kahului on Maui and about 1.3 m in Japan.
- More than 4,000 aftershocks of magnitude 4 or more followed; the biggest so far was magnitude 7.8 on 19 September 2025.
- The Bureau of Meteorology issues a Tsunami Watch first, then a Warning. For a land inundation threat, move at least 1 km inland or 10 m above sea level.
Sources
- USGS: M8.8 Kamchatka Peninsula event page and finite-fault model
- UNESCO Intergovernmental Oceanographic Commission: Global tsunami response to the M8.8 Kamchatka earthquake
- Bureau of Meteorology: About tsunami warnings
- Scientific American: Krasheninnikov eruption (3 Aug 2025); M7.8 aftershock (19 Sept 2025)
- Wikipedia: 2025 Kamchatka earthquake (compiled wave heights, damage and evacuation figures)
Image and video credits
All media in the video is public domain or Creative Commons (Wikimedia Commons unless noted). Licences: creativecommons.org/licenses
- USGS ShakeMap, 30 July 2025: United States Geological Survey, public domain
- Avachinsky Volcano from the ISS: ISS Expedition 27 crew, NASA, public domain
- Paramushir, Atlasov, Shumshu (Landsat 7): NASA data, image by Dave Pape, public domain
- Severo-Kurilsk aerial view: Victor Morozov, CC BY-SA 2.5
- Severo-Kurilsk main street: Victor Morozov, CC BY-SA 3.0
- Severo-Kurilsk: Eugene Kaspersky, CC BY-SA 4.0
- Petropavlovsk-Kamchatsky, 2025: Nikita Zhuravlev, CC BY-SA 4.0
- Petropavlovsk-Kamchatsky: Ilya Onofriychuk, public domain
- DART tsunami buoy diagram: NOAA, public domain
- New Zealand emergency mobile alert, 30 July 2025: Panamitsu, CC BY 4.0
- Tsunami warnings map: Japan Meteorological Agency, CC BY 4.0
- Crescent City harbor aerial view: Robert Campbell, CC BY-SA 3.0
- SWOT satellite measures Pacific tsunami: NASA/JPL-Caltech, public domain
- Klyuchevskaya Sopka eruption, 1994: NASA, public domain
- Ash streams from Klyuchevskaya Sopka (MODIS, 15 Aug 2025): NASA GSFC, public domain
- Krasheninnikov volcano: Igor Shpilenok, CC BY-SA 3.0
- Tsunami evacuation route sign, Kamakura: DimiTalen, CC0
- Tsunami evacuation route sign, San Francisco: Wikimedia Commons contributor, CC BY-SA 4.0
- M8.8 earthquake in Kamchatka (aftershock map): Ari375, CC BY-SA 4.0
- Krasheninnikov satellite loop: CSU/CIRA & NOAA/NESDIS, public domain
- NOAA tsunami animation: NOAA, public domain
- Overhead view of waves, Manly Beach: MGA Photography, CC BY 3.0
- Map data: Natural Earth (public domain)
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This video uses AI-generated narration and an AI-generated presenter character. N.A.N.A. presenters are AI characters, and every fact comes from the named sources.