QuakeIndex

Fault · California

Beaumont Plain fault

11 kmlong (7 mi), as mapped
not measuredhow fast it slips
< 15,000 yearssince it last broke the surface
43quakes of M2.5+ within 10 km since 2016

In plain English

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

The largest earthquake recorded near it was M 6.7 in 1899 (The 1899 San Jacinto, California Earthquake) — about 350,000 times the energy of an M3.0, the size people start to feel. It released about 170 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: 0–1.

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

San Andreas faultElsinore faultSan Jacinto faultNewport-Inglewood-Rose Canyon faultSan Clemente faultLenwood-Lockhart faultHelendale-South Lockhart faultSan Gabriel faultSierra Madre faultSan Diego Trough faultCalico-Hidalgo faultPalos Verdes faultPisgah-Bullion faultCamp Rock-Emerson-Copper Mountain faultPinto Mountain fault (includes Morongo Valley fault)North Frontal thrust systemJohnson Valley faultPuente Hills blind thrust systemLavic Lake faultSan Gorgonio Pass faultBullion Mountains faultMecca Hills faultHomestead Valley faultSan Onofre faultSan Joaquin Hills thrustCleghorn faultIndio Hills Fault ZoneBurnt Mountain faultCrafton Hills faultCoachella Fan Fault ZoneBanning faultEureka Peak faultLong Canyon faultOld Woman Springs faultRed Hill-Etiwanda Avenue fault M 6.7 · 1899 · The 1899 San Jacinto, California Earthquake M 6.7 · 1918 · The 1918 San Jacinto, California Earthquake
The Beaumont Plain fault as mapped at the surface (glowing), with the other mapped faults nearby, 43 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 6.7 The 1899 San Jacinto, California Earthquake
    December 25, 1899 · epicentre 12 km from the trace
  2. M 6.7 The 1918 San Jacinto, California Earthquake
    April 21, 1918 · epicentre 15 km from the trace
  3. M 4.4 4km NNW of Banning, CA
    January 6, 2016 · epicentre 8 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 3.1 7 km NNW of Banning, CA
    2026-04-04 · 8 km from the trace
  2. M 3.6 4 km S of Banning, CA
    2026-02-17 · 6 km from the trace
  3. M 2.5 4 km N of San Jacinto, CA
    2025-08-17 · 8 km from the trace
  4. M 2.9 3 km W of Banning, CA
    2025-07-26 · 4 km from the trace
  5. M 2.9 3 km W of Banning, CA
    2025-07-25 · 4 km from the trace
  6. M 2.9 10 km NE of San Jacinto, CA
    2025-06-11 · 8 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.