QuakeIndex

Seismic zone · Alaska

Atsaksovluk fault

not measuredhow fast it slips
last 150 yearssince it last broke the surface
72quakes of M2.5+ within 10 km since 2016

In plain English

It has broken the ground surface within the last 150 years.

The largest earthquake recorded near it was M 7.1 in 1937 (Central Alaska) — about 1,500,000 times the energy of an M3.0, the size people start to feel. It released about 720 kilotons of TNT.

This week vs. its last ten years

68/100

typical

1 quake of M1.5+ within 5 km of the trace in the last 7 days — busier than 68% of weeks since 2016. A normal week: 0–1.

Computed from the USGS catalogue · a description of the past, not a forecast · method

Tintina faultNorthern Foothills thrust fault (Northern Foothills fold and thrust belt) M 7.1 · 1937 · Central Alaska M 6.0 · 1929 · 39 km SW of Salcha, Alaska
The Atsaksovluk fault as mapped at the surface (glowing), with the other mapped faults nearby, 72 of the M2.5+ earthquakes within 10 km of it since 2016 (dots), and the epicentres of the large historic earthquakes recorded near it (rings). 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.

The big ones recorded near it

  1. M 7.1 Central Alaska
    July 22, 1937 · epicentre on the trace
  2. M 6.0 39 km SW of Salcha, Alaska
    July 4, 1929 · epicentre 3 km from the trace
  3. M 5.3 4 km SW of Salcha, Alaska
    January 19, 2024 · epicentre on the trace
  4. M 4.1 31 km SW of Salcha, Alaska
    November 5, 2021 · epicentre on the trace
  5. M 4.1 4 km SSW of Salcha, Alaska
    January 28, 2024 · epicentre 3 km from the trace
  6. M 4.0 19 km WSW of Salcha, Alaska
    November 17, 2022 · epicentre on the trace

Before 1973 from the USGS ComCat historical catalogue (within 25 km; epicentres of old earthquakes are estimates). Since 2016, M4+ within 10 km.

Most recent near it

  1. M 2.5 3 km S of Salcha, Alaska
    2026-05-19 · 3 km from the trace
  2. M 2.5 11 km W of Salcha, Alaska
    2026-05-12 · 0 km from the trace
  3. M 2.8 6 km SSW of Salcha, Alaska
    2026-05-04 · 3 km from the trace
  4. M 2.9 6 km SSW of Salcha, Alaska
    2026-05-04 · 3 km from the trace
  5. M 3.2 4 km SSW of Salcha, Alaska
    2026-05-04 · 2 km from the trace
  6. M 2.9 1 km S of Salcha, Alaska
    2026-03-31 · 2 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.