QuakeIndex

Seismic zone · Alaska

Rampart seismic zone

not measuredhow fast it slips
last 150 yearssince it last broke the surface
12quakes 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 6.5 in 1968 (15 km S of Rampart, Alaska) — about 150,000 times the energy of an M3.0, the size people start to feel. It released about 71 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

M 6.5 · 1968 · 15 km S of Rampart, Alaska
The Rampart seismic zone 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 6.5 15 km S of Rampart, Alaska
    October 29, 1968 · 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 3.0 9 km ESE of Rampart, Alaska
    2026-08-28 · 0 km from the trace
  2. M 2.7 25 km ENE of Manley Hot Springs, Alaska
    2026-05-07 · 7 km from the trace
  3. M 2.8 10 km E of Rampart, Alaska
    2023-12-15 · 0 km from the trace
  4. M 2.5 northern Alaska
    2023-09-23 · 2 km from the trace
  5. M 3.1 12 km ENE of Rampart, Alaska
    2022-10-20 · 0 km from the trace
  6. M 3.3 northern Alaska
    2022-05-08 · 0 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.