QuakeIndex

Fault · Alaska

Susitna Glacier fault

39 kmlong (24 mi), as mapped
1–5 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
21quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move 1 to 5 mm a year — 10 to 50 cm (4 to 20 inches) every century.

It has broken the ground surface within the last 150 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

Denali faultNorthern Foothills thrust fault (Northern Foothills fold and thrust belt)Molybdenum Ridge fault (Northern Foothills fold and thrust belt)
The Susitna Glacier fault as mapped at the surface (glowing), with the other mapped faults nearby, 21 of the M2.5+ earthquakes within 10 km of it since 2016 (dots), . Traces: USGS Quaternary Fault and Fold Database. Historic epicentres are estimates.

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

  1. M 2.8 84 km SW of Fort Greely, Alaska
    2026-06-08 · 1 km from the trace
  2. M 2.7 87 km E of Cantwell, Alaska
    2025-08-08 · 1 km from the trace
  3. M 2.6 58 km E of Cantwell, Alaska
    2024-12-27 · 9 km from the trace
  4. M 2.6 60 km E of Cantwell, Alaska
    2023-07-27 · 8 km from the trace
  5. M 2.9 81 km E of Cantwell, Alaska
    2023-03-26 · 9 km from the trace
  6. M 3.0 59 km ENE of Cantwell, Alaska
    2022-12-09 · 10 km from the trace

Neighbouring faults

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.