QuakeIndex

Fault · California

Lenwood-Lockhart fault

142 kmlong (88 mi), as mapped
0.2–1 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
28quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move 0.2 to 1 mm a year — 2 to 10 cm every century.

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

The largest earthquake recorded near it was M 4.1 in 2026 (18 km WSW of Johannesburg, CA) — about 39 times the energy of an M3.0, the size people start to feel. It released about 18 tons of TNT.

USGS maps it as 2 sections: Lenwood section, Lockhart section.

This week vs. its last ten years

Too quiet to rank: fewer than half a year's worth of weeks with any M1.5+ quake within 5 km, in ten years. A single quake here would read as "unusual", so we do not score it.

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

San Andreas faultGarlock faultSan Jacinto faultSouthern Sierra Nevada faultHelendale-South Lockhart faultSan Gabriel faultSierra Madre faultCalico-Hidalgo faultPisgah-Bullion faultCamp Rock-Emerson-Copper Mountain faultPinto Mountain fault (includes Morongo Valley fault)North Frontal thrust systemHarper faultBlackwater faultJohnson Valley faultSouthern Death Valley faultLittle Lake faultPuente Hills blind thrust systemLavic Lake faultBullion Mountains faultManix faultHomestead Valley faultCleghorn faultRaymond faultCrafton Hills faultVerdugo faultMt. General faultEureka Peak faultRed Pass faultLong Canyon faultHollywood faultOld Woman Springs faultRed Hill-Etiwanda Avenue fault
The Lenwood-Lockhart fault as mapped at the surface (glowing), with the other mapped faults nearby, 28 of the M2.5+ earthquakes within 10 km of it since 2016 (dots), . 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 4.1 18 km WSW of Johannesburg, CA
    June 1, 2026 · epicentre 9 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 17 km WSW of Johannesburg, CA
    2026-09-24 · 10 km from the trace
  2. M 3.0 17 km WSW of Johannesburg, CA
    2026-09-23 · 10 km from the trace
  3. M 3.2 17 km WSW of Johannesburg, CA
    2026-09-23 · 9 km from the trace
  4. M 2.5 17 km WSW of Johannesburg, CA
    2026-09-23 · 9 km from the trace
  5. M 2.6 18 km WSW of Johannesburg, CA
    2026-07-13 · 8 km from the trace
  6. M 3.0 17 km WSW of Johannesburg, CA
    2026-07-05 · 9 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.