Fault · Washington
Toppenish Ridge structures
In plain English
The two sides move less than 0.2 mm a year — under 2 cm a century. Slow faults can still produce large earthquakes, just rarely.
Its most recent surface rupture is younger than 15,000 years.
USGS maps it as 2 sections: Mill Creek fault, unnamed faults of the Toppenish Ridge uplift.
This week vs. its last ten years
Too quiet to rank: fewer than half a year's worth of weeks with any M1.5+ quake within 5 km, in ten years. A single quake here would read as "unusual", so we do not score it.
Computed from the USGS catalogue · a description of the past, not a forecast · method
Every year since 2016
Earthquakes of M2.5+ with an epicentre within 10 km of the mapped trace. Near is not the same as on: some will have slipped on neighbouring faults.
Most recent near it
- M 3.1 5 km WSW of Harrah, Washington
2026-08-11 · 10 km from the trace - M 2.8 17 km SSE of White Swan, Washington
2023-10-05 · 2 km from the trace
Fault trace, slip rate and age: USGS Quaternary Fault and Fold Database (public domain), simplified for the web. Earthquakes: USGS ComCat. QuakeIndex does not forecast earthquakes; a fault's history describes the past. For early warning use ShakeAlert.