Sanriku & Tohoku Coast
The Sanriku coastline faces the deep Japan Trench, where the Pacific plate subducts at ~8.5 cm/yr. This is the source zone of the devastating March 11, 2011 Tohoku earthquake (Mw 9.1) and tsunami, with continuous seismic tremor and aftershock sequences.
Danger Level (72h)
72-hour composite hazard forecast
Recent Quakes (14d)
Recorded in the selected 14d period
Max Magnitude (14d)
Largest earthquake in the selected 14d period
Tectonic Profile
Seismotectonic hazard assessment, structural exposure & historical context
Click to locate on map
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Living within seismically active radius (~300 km)
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Mixed construction stock with regional engineering standards
Subduction Zone
Major plate boundary with high strain accumulation
Seismically Stable Period
No significant earthquakes recorded in the selected 14d period.
Seismic Activity
Every recorded earthquake in this area — filter by time range and sort by time or severity.
Regional Volcanism & Monitored Vents
Active vents and Holocene volcanic structures within the monitored boundary (Sanriku & Tohoku Coast) · 16