QuakeIndex

Fault · Hawaii

Ka'oiki-Honu'apo fault system

58 kmlong (36 mi), as mapped
1–5 mm/yrhow fast it slips
< 15,000 yearssince it last broke the surface
14,079quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move 1 to 5 mm a year — 10 to 50 cm (4 to 20 inches) every century.

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

The largest earthquake recorded near it was M 7.9 in 1868 (The 1868 Great K`au, Hawaii Earthquake) — about 22,000,000 times the energy of an M3.0, the size people start to feel. It released about 11 megatons of TNT.

This week vs. its last ten years

66/100

typical

53 quakes of M1.5+ within 5 km of the trace in the last 7 days — busier than 66% of weeks since 2016. A normal week: 13–61.

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

Kilauea VolcanoMauna Loa VolcanoHilina fault systemLo'ihi SeamountKoa'e fault system M 7.9 · 1868 · The 1868 Great K`au, Hawaii Earthquake M 7.0 · 1868 · Ka`u District, Hawaii M 6.6 · 1880 · Kaoiki area, Hawaii M 6.5 · 1887 · Ka`u District, Hawaii M 6.4 · 1915 · Kaoiki area, Hawaii M 6.3 · 1877 · Kilauea area, Hawaii
The Ka'oiki-Honu'apo fault system as mapped at the surface (glowing), with the other mapped faults nearby, 400 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 7.9 The 1868 Great K`au, Hawaii Earthquake
    April 3, 1868 · epicentre 1 km from the trace
  2. M 7.0 Ka`u District, Hawaii
    March 28, 1868 · epicentre on the trace
  3. M 6.6 Kaoiki area, Hawaii
    September 24, 1880 · epicentre 5 km from the trace
  4. M 6.5 Ka`u District, Hawaii
    January 24, 1887 · epicentre on the trace
  5. M 6.4 Kaoiki area, Hawaii
    March 28, 1915 · epicentre 5 km from the trace
  6. M 6.3 Kilauea area, Hawaii
    May 31, 1877 · epicentre 9 km from the trace
  7. M 5.9 2 km SW of Pāhala, Hawaii
    February 9, 2024 · epicentre 2 km from the trace
  8. M 5.4 6 km SW of Volcano, Hawaii
    June 1, 2018 · epicentre 6 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 11 km SE of Pāhala, Hawaii
    2026-09-28 · 9 km from the trace
  2. M 2.8 6 km SW of Pāhala, Hawaii
    2026-09-28 · 2 km from the trace
  3. M 2.6 3 km SW of Pāhala, Hawaii
    2026-09-27 · 2 km from the trace
  4. M 2.9 5 km SW of Volcano, Hawaii
    2026-09-27 · 8 km from the trace
  5. M 2.6 17 km NE of Pāhala, Hawaii
    2026-09-26 · 3 km from the trace
  6. M 2.6 4 km S of Pāhala, Hawaii
    2026-09-23 · 0 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.