A magnitude 7.9 (MW) earthquake occurred on 1931-03-09, 12:49 local time (03:49 UTC) (just now), centered Off the coast of Hachinohe (75 km E, Japan). The hypocenter was located at a intermediate depth of 35 km. Primary telemetry verified by USGS alongside 1 regional seismic monitoring networks.
Curated Global Seismic Archive (1700–Present)
10.68 Mt TNT
intermediate (35–70 km (Intermediate))
Injuries: > 5,000 · ~22.9M felt
Timeline of foreshocks, main rupture, aftershocks and machine learning risk probability evolution.
Shaking intensity is modelled from magnitude, depth and distance (GMPE attenuation), not reported by residents.
| Town | Distance | Intensity |
|---|---|---|
| Hachinohe · Aomori | 75 km | MMI VIII |
| Morioka · Iwate | 146 km | MMI VII |
| Aomori · Aomori | 147 km | MMI VII |
| Hirosaki · Aomori | 165 km | MMI VII |
| Hakodate · Hokkaido | 194 km | MMI VII |
| Akita · Akita | 221 km | MMI VII |
Independent solutions for the same rupture. Differences of 0.1–0.3 in magnitude are normal and reflect method and station coverage.
| Agency | Source ID | Magnitude | Depth | Epicenter |
|---|---|---|---|---|
USGS Primary | iscgem906664 | M 7.9 | 35 km | 40.59, 142.42 |
Nearest mapped active fault: Oritsume, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).
View live seismic monitoring, historical danger benchmarks, fault slip models and recurrence intervals for this zone.