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M1.9 earthquake 66 km SE of Hōlualoa, Hawaii, United States

A magnitude 1.9 earthquake struck 66 km SE of Hōlualoa, Hawaii, United States at 05:54 local time (15:54 UTC) on 1 Oct 2026, at a depth of 33 km, according to USGS.

revised from M2.0

Data: USGS · updated 2026-10-02 00:19 UTC · reviewed

Magnitude
1.9micro
local magnitude (Richter) (ml)
revised from 2.0
Depth
33.3 km
Status
Reviewed
Origin time
2026-10-01 15:54:19 UTC
Local: 1 Oct 2026, 05:54:19 (Pacific/Honolulu)
Epicentre
19.196° N, 155.509° W

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Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
HōlualoaHawaii, United States · pop. 8,53866 kmINot felt
Kailua-KonaHawaii, United States · pop. 11,97571 kmINot felt
HiloHawaii, United States · pop. 43,26374 kmINot felt
HonoluluHawaii, United States · pop. 350,964340 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · HV, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · HVheadlineHawaiian Volcano Observatory via U.S. Geological Survey1.9 mlwas 2.033.3 km19.20° N, 155.51° W–Reviewed · 1 revision

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How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 11 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 33 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.9 releases about 23× the energy of M1.0, and its waves are about 8.1× taller on a seismogram. Energy: 11 kg of TNT vs 477 g of TNT.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

23 later earthquakes within 30 km; the largest was M2.3 1 day ago. 58 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.9

23 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.341.431
5.441.932
6.581.930
9.031.832
9.621.927
10.551.930
11.232.339
13.391.934
21.731.815
25.011.832
25.151.932
25.541.929
27.531.529
29.441.730
29.531.834
29.871.731
31.771.929
35.101.80
38.131.831
43.432.131
46.451.830
49.881.926
51.571.832
  1. 2.373 km SSE of Hōlualoa, Hawaii, United States10-02 03:08
  2. 2.167 km SE of Hōlualoa, Hawaii, United States10-03 11:20
  3. 1.967 km SE of Hōlualoa, Hawaii, United States10-02 17:03
  4. 1.972 km SW of Hawaiian Paradise Park, United States10-02 23:40
  5. 1.973 km SW of Hawaiian Paradise Park, United States10-03 17:47
  6. 1.967 km SE of Hōlualoa, Hawaii, United States10-02 01:31
  7. 1.976 km SSW of Hawaiian Paradise Park, United States10-02 05:17
  8. 1.984 km SSW of Hawaiian Paradise Park, United States10-01 21:20
  9. 1.969 km SE of Hōlualoa, Hawaii, United States10-01 22:29
  10. 1.968 km SE of Hōlualoa, Hawaii, United States10-02 02:27
  11. 1.957 km SW of Hawaiian Paradise Park, United States10-02 17:26
  12. 1.864 km SW of Hawaiian Paradise Park, United States10-03 19:28
  13. 1.877 km SSW of Hawaiian Paradise Park, United States10-02 13:37
  14. 1.869 km SE of Hōlualoa, Hawaii, United States10-03 14:21
  15. 1.875 km SW of Hawaiian Paradise Park, United States10-02 00:55
  16. 1.871 km SE of Hōlualoa, Hawaii, United States10-02 16:55
  17. 1.869 km SE of Hōlualoa, Hawaii, United States10-02 21:26
  18. 1.861 km SE of Hōlualoa, Hawaii, United States10-03 06:02
  19. 1.865 km SW of Hawaiian Paradise Park, United States10-03 03:00
  20. 1.757 km SW of Hawaiian Paradise Park, United States10-02 21:46
  21. 1.761 km SW of Hawaiian Paradise Park, United States10-02 21:20
  22. 1.565 km SW of Hawaiian Paradise Park, United States10-02 19:25
  23. 1.470 km SW of Hawaiian Paradise Park, United States10-01 16:14

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Reports on SeismoAtlas

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Event id hv75047252. First recorded here 1 Oct 2026, 15:57:52 UTC. Solutions: USGS · HV (usgs:hv75047252). Cite as: SeismoAtlas, “M1.9 earthquake 66 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75047252-m1-9-earthquake-66-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75047252. SeismoAtlas is not an official warning service.