QuakeIndex

Fault · Utah

Beaver Basin faults

39 kmlong (24 mi), as mapped
< 0.2 mm/yrhow fast it slips
< 15,000 yearssince it last broke the surface
14quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move less than 0.2 mm a year — under 2 cm a century. Slow faults can still produce large earthquakes, just rarely.

Its most recent surface rupture is younger than 15,000 years.

The largest earthquake recorded near it was M 6.6 in 1901 (Near Marysvale, Utah) — about 250,000 times the energy of an M3.0, the size people start to feel. It released about 120 kilotons of TNT.

USGS maps it as 2 sections: eastern margin faults, intrabasin faults.

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

Sevier/Toroweap faultSan Francisco Mountains (west side) faultCricket Mountains (west side) faultMineral Mountains (west side) faultsPavant faultsCedar City-Parowan monocline (and faults)Enoch graben faultsMaple Grove faultsParowan Valley faultsAnnabella graben faults M 6.6 · 1901 · Near Marysvale, Utah
The Beaver Basin faults as mapped at the surface (glowing), with the other mapped faults nearby, 14 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 6.6 Near Marysvale, Utah
    November 14, 1901 · epicentre 16 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 2.7 8 km ENE of Beaver, Utah
    2026-02-22 · 2 km from the trace
  2. M 2.9 2 km S of Beaver, Utah
    2025-05-29 · 1 km from the trace
  3. M 2.8 13 km SSE of Beaver, Utah
    2023-11-21 · 3 km from the trace
  4. M 2.9 15 km NW of Beaver, Utah
    2021-11-29 · 2 km from the trace
  5. M 3.0 6 km SW of Beaver, Utah
    2021-10-25 · 3 km from the trace
  6. M 3.3 6.6km SW of Beaver, Utah
    2021-10-24 · 3 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.