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SeismoAtlas

M2.8 earthquake 68 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.8 earthquake struck 68 km SE of Hōlualoa, Hawaii, United States at 20:42 local time (06:42 UTC) on 2 Sept 2026, at a depth of 31 km, according to USGS.

Data: USGS · updated 2026-09-13 07:17 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
30.7 km
Status
Reviewed
Origin time
2026-09-03 06:42:57 UTC
Local: 2 Sept 2026, 20:42:57 (Pacific/Honolulu)
Epicentre
19.186° N, 155.499° 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. 8,53868 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40471 kmINot felt
HiloHawaii, United States · pop. 43,26374 kmINot felt
HonoluluHawaii, United States · pop. 350,964341 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 Survey2.8 ml30.7 km19.19° N, 155.50° W–Reviewed

How big was it?

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

It released roughly the energy of 223 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 31 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.8 releases about 30× the energy of M1.8, and its waves are about 9.5× taller on a seismogram. Energy: 223 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

91 later earthquakes within 30 km; the largest was M4.1 10 days ago. 4 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.822.632
15.933.432
29.633.512
32.313.333
122.362.530
154.672.632
201.252.631
251.294.013
251.632.611
292.062.632
359.904.112
362.722.510
364.623.014
380.762.814
392.702.612
439.392.631
443.781.830
444.252.631
450.931.831
451.441.933
453.141.728
455.261.831
458.381.228
459.651.839
462.471.729
467.632.131
467.912.032
468.791.928
471.591.930
479.461.928
482.631.811
483.881.928
483.932.031
484.971.629
486.752.610
487.661.810
490.131.629
490.221.726
490.252.033
490.721.728
490.871.829
490.891.728
492.931.830
495.101.632
496.151.928
496.411.932
497.552.232
498.011.630
499.982.133
500.121.830
503.031.533
506.081.836
512.811.831
516.742.129
519.822.05
519.901.731
520.261.232
523.181.79
523.481.830
526.141.927
527.351.830
530.251.935
530.721.730
531.062.228
532.501.612
547.521.610
548.642.131
551.842.328
560.721.930
561.332.08
562.602.430
564.972.136
564.982.632
569.862.031
578.951.930
579.451.827
587.251.910
589.951.928
593.651.729
595.642.129
600.911.727
603.622.132
603.891.732
604.872.835
604.932.133
605.242.433
605.651.830
605.812.134
606.032.333
606.191.732
606.742.333
  1. 4.171 km SE of Hōlualoa, Hawaii, United States09-18 06:36
  2. 4.071 km SE of Hōlualoa, Hawaii, United States09-13 18:00
  3. 3.571 km SE of Hōlualoa, Hawaii, United States09-04 12:20
  4. 3.471 km SW of Hawaiian Paradise Park, United States09-03 22:39
  5. 3.370 km SE of Hōlualoa, Hawaii, United States09-04 15:01
  6. 3.070 km SE of Hōlualoa, Hawaii, United States09-18 11:19
  7. 2.870 km SE of Hōlualoa, Hawaii, United States09-19 03:28
  8. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  9. 2.670 km SE of Hōlualoa, Hawaii, United States09-13 18:20
  10. 2.674 km SW of Hawaiian Paradise Park, United States09-09 17:23
  11. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 14:06
  12. 2.671 km SW of Hawaiian Paradise Park, United States09-03 13:32
  13. 2.667 km SE of Hōlualoa, Hawaii, United States09-15 10:46
  14. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  15. 2.661 km SW of Hawaiian Paradise Park, United States09-11 15:58
  16. 2.671 km SE of Hōlualoa, Hawaii, United States09-19 15:24
  17. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 18:58
  18. 2.671 km SE of Hōlualoa, Hawaii, United States09-23 13:27
  19. 2.570 km SE of Hōlualoa, Hawaii, United States09-18 09:26
  20. 2.566 km SE of Hōlualoa, Hawaii, United States09-08 09:04
  21. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  22. 2.457 km SW of Hawaiian Paradise Park, United States09-26 17:19
  23. 2.369 km SE of Hōlualoa, Hawaii, United States09-26 06:33
  24. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  25. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id hv75028562. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · HV (usgs:hv75028562). Cite as: SeismoAtlas, “M2.8 earthquake 68 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75028562-m2-8-earthquake-68-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75028562. SeismoAtlas is not an official warning service.