QuakeIndex

Fault · Alaska

Patton Bay fault

68 kmlong (42 mi), as mapped
1–5 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
12quakes 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.

The largest earthquake recorded near it was M 6.1 in 1964 (53 km E of Chenega, Alaska) — about 43,000 times the energy of an M3.0, the size people start to feel. It released about 21 kilotons of TNT.

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

Alaska-Aleutian subduction zoneDenali fault M 6.1 · 1964 · 53 km E of Chenega, Alaska
The Patton Bay fault as mapped at the surface (glowing), with the other mapped faults nearby, 12 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 6.1 53 km E of Chenega, Alaska
    September 16, 1964 · epicentre 15 km from 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 2.6 44 km E of Chenega, Alaska
    2026-07-16 · 5 km from the trace
  2. M 2.8 34 km ESE of Chenega, Alaska
    2023-01-04 · 2 km from the trace
  3. M 2.8 46 km E of Chenega, Alaska
    2022-02-06 · 7 km from the trace
  4. M 3.0 35 km SE of Chenega, Alaska
    2021-06-27 · 5 km from the trace
  5. M 3.6 54 km S of Chenega, Alaska
    2021-03-07 · 5 km from the trace
  6. M 2.5 33 km E of Chenega, Alaska
    2021-02-12 · 1 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.