QuakeIndex

Fault · California

Fish Slough fault

23 kmlong (14 mi), as mapped
0.2–1 mm/yrhow fast it slips
< 15,000 yearssince it last broke the surface
41quakes 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.

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

The largest earthquake recorded near it was M 6.8 in 1872 (Near Round Valley, California) — about 500,000 times the energy of an M3.0, the size people start to feel. It released about 240 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

San Andreas faultSouthern Sierra Nevada faultOwens Valley faultWassuk Range faultWhite Mountains faultNorthern Death Valley faultFish Lake Valley faultHunter Mountain- Saline Valley faultHuntoon Valley fault systemLone Mountain faultEmigrant Peak faultRound Valley faultSilver Lake faultHilton Creek faultLong Valley faultDeep Springs faultHartley Springs faultMono Lake faultRobinson Creek faultMcAfee Canyon fault M 6.8 · 1872 · Near Round Valley, California M 6.0 · 1910 · Near Bishop, California
The Fish Slough fault as mapped at the surface (glowing), with the other mapped faults nearby, 41 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 6.8 Near Round Valley, California
    April 11, 1872 · epicentre 9 km from the trace
  2. M 6.0 Near Bishop, California
    May 6, 1910 · epicentre 11 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 2.5 8 km NNE of Dixon Lane-Meadow Creek, CA
    2025-08-20 · 1 km from the trace
  2. M 2.9 1 km N of West Bishop, CA
    2025-05-28 · 8 km from the trace
  3. M 2.7 13 km NNE of Dixon Lane-Meadow Creek, CA
    2024-11-28 · 2 km from the trace
  4. M 2.7 8 km NW of Dixon Lane-Meadow Creek, CA
    2024-09-14 · 7 km from the trace
  5. M 2.7 6 km NNW of Dixon Lane-Meadow Creek, CA
    2024-09-01 · 5 km from the trace
  6. M 3.4 7 km NNW of Dixon Lane-Meadow Creek, CA
    2024-09-01 · 5 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.