A magnitude 6.8 earthquake near E of Yamada, Japan on 09/11/2025 08:03 UTC (depth 18 km) was screened for tsunami potential. Events like this are monitored because of their relevance to the British Columbia / Cascadia coast.
Event technical data
| Magnitude | M 6.8 |
| Depth | 18 km |
| Coordinates | 39.4850°, 143.3782° |
| Time (UTC) | 2025-11-09 08:03 UTC |
| Location | 122 km E of Yamada, Japan |
| Tsunami potential | Low |
Tsunami assessment
Assessment: Magnitude or depth below the typical threshold for a destructive tsunami, but worth monitoring. Shallow (<70 km) offshore earthquakes of M7+ are the primary driver of seismic sea waves; depth, location relative to the coast and seafloor displacement govern the actual hazard.
Geotechnical relevance
For coastal geotechnical engineering in Canada, tsunami hazard influences site selection, coastal foundation design, scour and liquefaction in saturated coastal sands, and the resilience of port and waterfront structures. Monitoring tsunamigenic events informs run-up and inundation assumptions.
Official warning system
U.S. National Tsunami Warning Center (covers Canada’s Pacific coast) issues the official tsunami watches, advisories and warnings for the British Columbia / Cascadia coast. Official tsunami warning portal →
Seismic source data: USGS Earthquake Hazards Program.
Standard Penetration Test — coastal geotechnical services
Seismic and tsunami-aware site studies, coastal foundations and liquefaction assessment.
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