This undersea earthquake generated recorded tsunami waves across coastal and trans-oceanic sectors. Preserved in seismic archive for scientific reference — no active hazard exists.
A magnitude 9.0 (MW) earthquake occurred on 1700-01-26, 13:00 local time (21:00 UTC) (just now), centered Off the coast of Portland (190 km W, USA). The hypocenter was located at a shallow depth of 20 km. Primary telemetry verified by USGS/ISC-GEM alongside 1 regional seismic monitoring networks.
Curated Global Seismic Archive (1700–Present)
476.88 Mt TNT
shallow (Shallow crustal)
Injuries: > 5,000 · ~21M 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 |
|---|---|---|
| Corvallis · Oregon | 144 km | MMI IX |
| Salem · Oregon | 156 km | MMI IX |
| Albany · Oregon | 157 km | MMI IX |
| Eugene · Oregon | 184 km | MMI IX |
| Portland · Oregon | 191 km | MMI IX |
| Springfield · Oregon | 192 km | MMI IX |
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 | cascadia1700_benchmark | M 9.0 | 20 km | 45.00, -125.00 |
Nearest mapped active fault: Cascadia Megathrust, 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.