NOAA PTWC

Tsunami situation after M7.0: Bonin Islands Japan Region

Information

The covered warning centres issued information statements only for this event, no tsunami warning.

QuakeMap24 is not a warning authority. Follow instructions from the responsible local authorities for protective action.

Key facts

Magnitude
M7.0
Depth · NOAA PTWC
473.0 km
Event time
Oct 24, 2026, 2:09 AM UTC
First bulletin
Oct 25, 2026, 2:24 AM UTC
Latest bulletin
Oct 25, 2026, 2:24 AM UTC
Bulletins
1
Show in tsunami overview

Situation map

WarningAdvisoryWatchThreat messageInformationOfficial forecast and observation pointsTide gauge

Official alert areas are not modelled inundation zones. The source country identifies the earthquake, not necessarily an affected coastline. Historical events and monitoring stations can be toggled separately.

Arrival times at coastal locations

The warning centre published no arrival times for coastal locations for this bulletin.

Measured waves at tide gauges

Own analysis, not official

A tsunami signal was detected at 0 of 14 analysed tide gauges.

Tide gaugeDistanceSignalMax. riseLargest excursionFirst arrivalBackground noise
Chichijima
Japan		247 kmno signal———0.5 cm
Kushimoto
Japan		726 kmno signal———0.8 cm
Omaezaki
Japan		752 kmno signal———0.6 cm
Mera
Japan		770 kmno signal———0.9 cm
Tosashimizu
Japan		851 kmno signal———0.9 cm
Aburatsu
Japan		910 kmno signal———0.7 cm
Toyama
Japan		1,006 kmno signal———0.3 cm
Hamada
Japan		1,067 kmno signal———0.9 cm
Nagasaki
Japan		1,096 kmno signal———0.9 cm
Saigo
Japan		1,101 kmno signal———0.5 cm
Sado
Japan		1,155 kmno signal———0.3 cm
Pago Bay, Guam
United States		1,698 kmno signal———0.6 cm
Korsakov
Russia		2,087 kmno signal———2.4 cm
Poronajsk
Russia		2,375 kmno signal———2.0 cm

Raw data from IOC/UNESCO and NOAA tide gauges, de-tided by QuakeMap24 (moving quadratic fit over ±90 minutes). A signal counts only if the first excursion of at least 5 cm and five times the background noise falls within the physically possible arrival window, the sea level stays clearly more disturbed than before the quake for two hours, and it exceeds anything this gauge showed beforehand. Shown is the largest rise above normal sea level. Noisy or gappy gauges are discarded. Wind, seiches or sensor faults can still mimic signals; official statements take precedence. Analysed: Oct 28, 2026, 6:15 AM UTC

Bulletin timeline

Area reported by source

BONIN ISLANDS JAPAN REGION

  1. Information NOAA PTWC

    Valid until:

    Original authority text

    Original source language; no automatic translation.

    PTWC TSUNAMI INFORMATION STATEMENT

    PTWC TSUNAMI INFORMATION STATEMENT - Event details: Preliminary magnitude 7.0 (Mwp) earthquake / Lat: 28.000, Lon: 139.900 at 2026-10-24T02:09:00Z

    N/A

    Official source ↗

Historical tsunamis in the region

Historical tsunamis →