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SeismoAtlas

M3.5 earthquake 71 km SE of Hōlualoa, Hawaii, United States

A magnitude 3.5 earthquake struck 71 km SE of Hōlualoa, Hawaii, United States at 02:20 local time (12:20 UTC) on 4 Sept 2026, at a depth of 12 km, according to USGS.

3 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-08 21:21 UTC · reviewed

Magnitude
3.5minor
local magnitude (Richter) (ml)
Depth
11.8 km
Status
Reviewed
Origin time
2026-09-04 12:20:33 UTC
Local: 4 Sept 2026, 02:20:33 (Pacific/Honolulu)
Epicentre
19.157° N, 155.484° 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. 11,40472 kmINot felt
HiloHawaii, United States · pop. 43,26376 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. Likely felt out to about 25 km.

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 Survey3.5 ml11.8 km19.16° N, 155.48° W–Reviewed

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 3.1 t 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 12 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.5 releases about 36× the energy of M2.5, and its waves are about 11× taller on a seismogram. Energy: 3.1 t of TNT vs 85 kg of TNT.

Each square is the energy of one M2.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

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

Aftershocks

Mainshock M3.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.683.333
92.732.530
125.042.632
171.632.631
221.664.013
222.002.611
262.432.632
330.274.112
333.092.510
334.993.014
351.142.814
363.072.612
409.762.631
414.161.830
414.632.631
421.301.831
421.811.933
423.511.728
425.631.831
428.761.228
430.031.839
432.841.729
438.012.131
438.282.032
439.171.928
441.971.930
449.831.928
453.011.811
454.251.928
454.312.031
455.341.629
457.122.610
458.031.810
460.501.629
460.591.726
460.622.033
461.091.728
461.251.829
461.261.728
463.311.830
465.471.632
466.531.928
466.781.932
467.922.232
468.391.630
470.352.133
470.501.830
473.411.533
476.451.836
483.181.831
487.112.129
490.202.05
490.271.731
490.631.232
493.561.79
493.861.830
496.521.927
497.721.830
500.631.935
501.091.730
501.432.228
502.881.612
517.901.610
519.012.131
522.222.328
531.091.930
531.702.08
532.982.430
535.342.136
535.362.632
540.242.031
549.321.930
549.821.827
557.621.910
560.321.928
564.021.729
566.022.129
571.281.727
573.992.132
574.261.732
575.252.835
575.302.133
575.612.433
576.021.830
576.182.134
576.412.333
576.561.732
577.112.333
  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. 3.370 km SE of Hōlualoa, Hawaii, United States09-04 15:01
  4. 3.070 km SE of Hōlualoa, Hawaii, United States09-18 11:19
  5. 2.870 km SE of Hōlualoa, Hawaii, United States09-19 03:28
  6. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  7. 2.670 km SE of Hōlualoa, Hawaii, United States09-13 18:20
  8. 2.674 km SW of Hawaiian Paradise Park, United States09-09 17:23
  9. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 14:06
  10. 2.667 km SE of Hōlualoa, Hawaii, United States09-15 10:46
  11. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  12. 2.661 km SW of Hawaiian Paradise Park, United States09-11 15:58
  13. 2.671 km SE of Hōlualoa, Hawaii, United States09-19 15:24
  14. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 18:58
  15. 2.671 km SE of Hōlualoa, Hawaii, United States09-23 13:27
  16. 2.570 km SE of Hōlualoa, Hawaii, United States09-18 09:26
  17. 2.566 km SE of Hōlualoa, Hawaii, United States09-08 09:04
  18. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  19. 2.457 km SW of Hawaiian Paradise Park, United States09-26 17:19
  20. 2.369 km SE of Hōlualoa, Hawaii, United States09-26 06:33
  21. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  22. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  23. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  24. 2.276 km SW of Hawaiian Paradise Park, United States09-24 00:15
  25. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27

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.

USGS “Did You Feel It?” has 3 reports: add yours at USGS.

Event id hv75029197. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · HV (usgs:hv75029197). Cite as: SeismoAtlas, “M3.5 earthquake 71 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75029197-m3-5-earthquake-71-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75029197. SeismoAtlas is not an official warning service.