Widespread Tsunami Warning Issued After M8.7 Earthquake Off the Coast of Russia

Date: 2025.08.05

📌 News Summary: 【TSUNAMI WARNING】From Hokkaido to Wakayama: Tsunami warning issued – Tsunami waves have been observed in multiple locations.

Source: NHK | Latest update: July 30, 2025

1. Tsunami warning triggered by major earthquake in Russia

On the morning of July 30, 2025, a powerful earthquake with a magnitude of 8.7 struck near Russia’s Kamchatka Peninsula, prompting a widespread tsunami warning for Pacific coastal regions of Japan, stretching from Hokkaido to Wakayama Prefecture.

Japan’s Meteorological Agency has officially issued the tsunami warning, and tsunami waves have already been observed in several areas.

⚠️ Tsunami waves may arrive in multiple surges. Continue evacuating to higher ground or as far inland as possible.
Do not return until the official warning has been fully lifted.

2. Tsunami observations (As of 12:29 PM)

🔴 Waves up to 50 cm:

– Ishinomaki Port, Miyagi Prefecture — 11:51 AM

🔴 Waves up to 40 cm:

– Tokachi Port, Hiroo Town, Hokkaido — 10:51 AM

– Hachinohe Port, Aomori Prefecture — 11:16 AM

– Tomakomai Port, Hokkaido — 11:32 AM

– Onahama Port, Iwaki City, Fukushima — 11:32 AM

– Oarai Port, Ibaraki Prefecture — 11:38 AM

– Soma Port, Fukushima Prefecture — 11:49 AM

– Sendai Port — 11:52 AM

– Hamanaka Town, Hokkaido — 11:54 AM

🔴 Waves up to 30 cm:

– Nemuro City, Hokkaido — 10:30 AM

– Kushiro Port, Hokkaido — 10:42 AM

– Erimo Town, Hokkaido — 10:46 AM

– Ofunato Port, Iwate Prefecture — 11:07 AM

– Monbetsu Port, Hokkaido — 11:15 AM

– Esashi Town, Hokkaido (Okhotsk Coast) — 11:22 AM

– Kashima Port, Ibaraki Prefecture — 11:43 AM

🔴 Waves up to 20 cm:

– Abashiri Port, Hokkaido — 10:53 AM

– Kamaishi Port, Iwate Prefecture — 10:58 AM

– Miyako Port, Iwate Prefecture — 10:59 AM

🔴 Waves up to 10 cm:

– Yokosuka Port, Kanagawa Prefecture — 12:10 PM

– Yokohama Port — 12:26 PM

🔴 Other locations reporting tsunami waves:

– Choshi City, Chiba Prefecture — 11:09 AM

– Chichi-jima Island, Ogasawara Islands — 11:57 AM

– Misaki Port, Miura City, Kanagawa Prefecture — 11:29 AM

– Aburatsubo Area, Miura City — 11:22 AM

– Ito City, Shizuoka Prefecture — 11:21 AM

– Owase Port, Mie Prefecture — 12:08 PM

3. Statement from the Japan Meteorological Agency

At a press conference held at 10:10 AM, Mr. Kiyomoto Shinji, an official from the Earthquake and Tsunami Prevention Department of the Japan Meteorological Agency, emphasized the following points:

– Residents along the coast and near rivers must immediately evacuate to higher ground or secure buildings.

– Do not leave safe locations until the warning is officially lifted.

– The first tsunami wave could have arrived as early as 10:00 AM and may already be present.

– The tsunami will persist, and subsequent waves could be higher than the initial one.

– Although the earthquake occurred far from Japan, it caused light tremors across many regions.

– Earlier this month, the area also experienced a magnitude 7.4 earthquake.

– This region previously experienced a major earthquake in 1952, which generated tsunami waves up to 1 meter high in Iwate Prefecture.

4. Offshore Information and Maximum Tsunami Wave Warning

🌐 Tsunami Observations Offshore (11:28 AM)

– GPS device offshore Kinkasan Island, Miyagi Prefecture — 10:46 AM

– Water pressure sensor offshore Kamisu City, Ibaraki Prefecture — 10:55 AM

⚠️ Tsunami waves forecasted to reach up to 3 meters

The earthquake occurred at 8:25 AM, initially estimated at M8.0, later revised to M8.7 based on international data (U.S., Hawaii).
This marks the first time since 2010 (following the Chile earthquake) that Japan has issued a tsunami warning due to an offshore earthquake abroad.

⚠️ IMPORTANT NOTES:

– Tsunami waves may exceed forecasts and inundate further inland.

– Subsequent waves could be higher than the initial wave.

– Do not return to coastal areas until an official safety announcement is made.

– Assist those around you in evacuating and stay updated via NHK, radio broadcasts, and disaster prevention apps.

5. Conclusion

The major M8.7 earthquake off the coast of the Kamchatka Peninsula has triggered a serious tsunami warning for the coastal regions from Hokkaido to Wakayama. Tsunami waves have been observed at multiple locations, reaching heights of up to 50 cm, with the potential to rise as high as 3 meters in the near future.

⚠️ Tsunami waves will not come in just one surge — subsequent waves may be larger and more dangerous than the first.

⚠️ Waves could exceed forecasts and inundate further inland.

📢 For your safety and the safety of the community, please remember:

– Do not return to coastal areas until an official safety confirmation is announced.

– Evacuate immediately to higher ground or seek shelter in tsunami-resistant buildings if hills or mountains are not nearby.

– Encourage those around you to move to safe locations together.

– Continuously monitor updates from NHK, radio broadcasts, disaster alert apps, or local authorities.