Fault · Alaska
Kosakuts fault (Chugach-St. Elias fold and thrust belt)
In plain English
The two sides move 1 to 5 mm a year — 10 to 50 cm (4 to 20 inches) every century.
Its most recent surface rupture is younger than 130,000 years.
This week vs. its last ten years
0/100
quiet
0 quakes of M1.5+ within 5 km of the trace in the last 7 days — busier than 0% of weeks since 2016. A normal week: 0–0.
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 2.6 116 km S of McCarthy, Alaska
2026-02-03 · 10 km from the trace - M 2.6 122 km S of McCarthy, Alaska
2025-11-05 · 3 km from the trace - M 2.6 117 km S of McCarthy, Alaska
2025-10-01 · 7 km from the trace - M 2.6 120 km S of McCarthy, Alaska
2024-09-09 · 5 km from the trace - M 2.7 129 km SSE of McCarthy, Alaska
2024-08-27 · 10 km from the trace - M 2.5 118 km S of McCarthy, Alaska
2024-05-19 · 8 km from the trace
Neighbouring faults
- Hope Creek fault (Chugach-St. Elias fold and thrust belt) 8 km away
- Miller Creek fault (Chugach-St. Elias fold and thrust belt) 18 km away
- White River syncline (Chugach-St. Elias fold and thrust belt) 24 km away
- Pamplona fault 25 km away
- Yakataga anticline (Chugach-St. Elias fold and thrust belt) 27 km away
- Sullivan fault (Chugach-St. Elias fold and thrust belt) 29 km away
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.