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M1.8 earthquake 71 km SE of Hōlualoa, Hawaii, United States

A magnitude 1.8 earthquake struck 71 km SE of Hōlualoa, Hawaii, United States at 16:50 local time (02:50 UTC) on 23 Sept 2026, at a depth of 30 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-24 02:53 UTC · automatic solution

Magnitude
1.8micro
duration magnitude (md)
Depth
30.1 km
Status
Automatic
Origin time
2026-09-24 02:50:18 UTC
Local: 23 Sept 2026, 16:50:18 (Pacific/Honolulu)
Epicentre
19.145° N, 155.497° W

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. 8,53871 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40474 kmINot felt
HiloHawaii, United States · pop. 43,26378 kmINot felt
HonoluluHawaii, United States · pop. 350,964345 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · HVheadlineHawaiian Volcano Observatory via U.S. Geological Survey1.8 md30.1 km19.15° N, 155.50° W–Automatic

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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 8 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 30 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.8 releases about 18× the energy of M1.0, and its waves are about 6.8× taller on a seismogram. Energy: 8 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

40 later earthquakes within 30 km; the largest was M2.8 10 h ago. 38 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.911.533
5.961.836
12.691.831
16.622.129
19.702.05
19.781.731
20.131.232
23.361.830
26.021.927
27.221.830
30.131.935
30.601.730
30.942.228
32.381.612
47.401.610
48.522.131
51.722.328
60.591.930
61.212.08
62.482.430
64.852.136
64.862.632
69.742.031
78.831.930
79.331.827
87.131.910
89.831.928
93.521.729
95.522.129
100.791.727
103.502.132
103.771.732
104.752.835
104.802.133
105.112.433
105.531.830
105.692.134
105.912.333
106.061.732
106.612.333
  1. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  2. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  3. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  4. 2.457 km SW of Hawaiian Paradise Park, United States09-26 17:19
  5. 2.369 km SE of Hōlualoa, Hawaii, United States09-26 06:33
  6. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  7. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  8. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  9. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27
  10. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  11. 2.172 km SE of Hōlualoa, Hawaii, United States09-28 11:38
  12. 2.164 km SW of Hawaiian Paradise Park, United States09-28 02:21
  13. 2.167 km SW of Hawaiian Paradise Park, United States09-26 03:21
  14. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 10:20
  15. 2.166 km SE of Hōlualoa, Hawaii, United States09-26 19:41
  16. 2.052 km SW of Hawaiian Paradise Park, United States09-24 22:32
  17. 2.057 km ESE of Hōlualoa, Hawaii, United States09-26 16:02
  18. 2.067 km SE of Hōlualoa, Hawaii, United States09-27 00:34
  19. 1.959 km ESE of Hōlualoa, Hawaii, United States09-27 17:58
  20. 1.974 km SW of Hawaiian Paradise Park, United States09-25 04:51
  21. 1.966 km SE of Hōlualoa, Hawaii, United States09-25 08:58
  22. 1.965 km SE of Hōlualoa, Hawaii, United States09-26 15:25
  23. 1.957 km SW of Hawaiian Paradise Park, United States09-27 09:39
  24. 1.965 km SW of Hawaiian Paradise Park, United States09-27 20:39
  25. 1.877 km SSW of Hawaiian Paradise Park, United States09-24 08:47

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Reports on SeismoAtlas

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Event id hv75043017. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · HV (usgs:hv75043017). Cite as: SeismoAtlas, “M1.8 earthquake 71 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75043017-m1-8-earthquake-71-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75043017. SeismoAtlas is not an official warning service.