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SeismoAtlas

M2.8 earthquake 69 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.8 earthquake struck 69 km SE of Hōlualoa, Hawaii, United States at 01:35 local time (11:35 UTC) on 28 Sept 2026, at a depth of 35 km, according to USGS.

Data: USGS · updated 2026-09-28 17:20 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
34.6 km
Status
Reviewed
Origin time
2026-09-28 11:35:25 UTC
Local: 28 Sept 2026, 01:35:25 (Pacific/Honolulu)
Epicentre
19.157° N, 155.518° 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. 8,53869 kmINot felt
Kailua-KonaHawaii, United States · pop. 11,97574 kmINot felt
HiloHawaii, United States · pop. 43,26378 kmINot felt
HonoluluHawaii, United States · pop. 350,964342 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 ml34.6 km19.16° N, 155.52° 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 35 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

227 later earthquakes within 30 km; the largest was M3.3 20 days ago. 67 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.051.535
0.361.935
0.781.830
0.942.134
1.161.835
1.311.732
1.861.735
10.702.332
11.821.833
11.872.037
14.581.833
21.101.932
23.221.827
26.071.733
35.681.726
36.221.96
37.111.931
39.071.728
51.452.631
57.721.66
62.461.86
66.761.727
70.531.830
74.022.530
75.022.041
76.311.933
76.661.431
81.761.932
82.901.930
85.341.832
85.941.927
86.861.930
87.542.339
89.701.934
98.041.815
101.331.832
101.461.932
101.851.929
103.841.529
105.761.730
105.841.834
106.191.731
108.091.729
111.421.80
114.441.831
119.741.533
122.771.830
126.192.127
127.881.832
135.531.732
137.671.829
138.521.633
138.551.610
146.111.728
146.421.829
149.411.829
151.251.931
154.341.727
159.791.632
165.431.910
166.771.830
168.691.830
183.291.843
196.291.19
196.301.929
201.241.934
201.871.827
202.861.633
213.291.829
214.471.68
216.971.831
226.711.732
227.471.933
235.241.827
237.562.261
243.381.948
243.461.950
243.541.82
248.691.928
248.992.032
251.221.727
251.301.829
254.891.927
281.441.732
283.901.631
284.911.133
289.491.731
290.551.928
294.371.828
305.211.828
311.191.741
321.881.928
324.701.830
331.721.833
331.861.811
334.111.740
335.091.730
340.981.830
341.431.931
344.771.631
345.351.733
349.231.440
353.431.734
355.781.829
361.232.049
362.371.927
362.891.734
363.791.733
366.271.832
367.671.930
368.211.635
368.931.934
370.132.034
371.751.934
373.022.232
373.531.930
381.112.027
387.601.930
390.201.428
390.331.728
390.441.933
392.111.737
398.582.227
398.601.729
403.022.433
408.781.935
417.941.735
418.641.835
420.151.845
424.581.828
426.761.829
427.431.830
428.192.10
430.671.831
432.371.89
437.911.833
442.261.434
444.451.77
445.092.134
446.871.70
447.662.031
451.202.132
454.111.431
454.531.729
454.811.129
455.801.728
456.971.89
458.951.50
460.401.433
462.841.914
463.752.131
463.811.10
467.321.831
477.341.729
482.061.829
486.891.930
488.743.0-1
496.541.929
498.081.830
499.651.99
505.761.833
507.961.731
514.051.38
514.441.931
521.162.337
523.591.930
524.681.929
529.951.828
530.131.931
532.932.834
544.741.730
554.581.234
561.341.929
573.981.632
574.031.829
574.582.132
575.111.829
577.641.933
577.871.935
578.231.935
578.421.835
581.371.735
582.711.733
586.671.830
592.931.75
594.131.840
596.241.831
601.332.030
602.682.229
603.231.829
604.283.329
605.842.032
606.141.631
606.241.130
608.191.428
610.191.9-1
611.701.830
615.871.86
615.901.97
620.851.949
636.501.936
636.621.940
637.781.99
638.602.133
639.441.928
642.471.847
642.712.132
654.151.228
655.191.830
660.101.740
661.701.931
663.501.731
665.691.832
673.962.129
681.191.828
683.251.829
686.851.830
688.181.831
696.021.732
699.922.133
700.831.931
702.411.731
703.252.530
706.201.733
708.331.230
715.471.729
715.471.833
  1. 3.369 km SE of Hōlualoa, Hawaii, United States10-23 15:52
  2. 3.056 km SSE of Hōlualoa, Hawaii, United States10-18 20:19
  3. 2.875 km SW of Hawaiian Paradise Park, United States10-20 16:31
  4. 2.655 km SW of Hawaiian Paradise Park, United States09-30 15:02
  5. 2.566 km SE of Hōlualoa, Hawaii, United States10-27 18:50
  6. 2.568 km SE of Hōlualoa, Hawaii, United States10-01 13:36
  7. 2.469 km SE of Hōlualoa, Hawaii, United States10-15 06:36
  8. 2.368 km SW of Hawaiian Paradise Park, United States09-28 22:17
  9. 2.373 km SSE of Hōlualoa, Hawaii, United States10-02 03:08
  10. 2.374 km SW of Hawaiian Paradise Park, United States10-20 04:45
  11. 2.261 km SSE of Hōlualoa, Hawaii, United States10-08 09:08
  12. 2.270 km SE of Hōlualoa, Hawaii, United States10-23 14:16
  13. 2.266 km SW of Hawaiian Paradise Park, United States10-14 00:36
  14. 2.264 km SW of Hawaiian Paradise Park, United States10-15 02:10
  15. 2.168 km SE of Hōlualoa, Hawaii, United States10-27 15:30
  16. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  17. 2.169 km SE of Hōlualoa, Hawaii, United States10-25 02:11
  18. 2.173 km SW of Hawaiian Paradise Park, United States10-03 17:47
  19. 2.169 km SE of Hōlualoa, Hawaii, United States10-17 00:40
  20. 2.177 km SW of Hawaiian Paradise Park, United States10-17 19:20
  21. 2.168 km SE of Hōlualoa, Hawaii, United States10-26 13:32
  22. 2.167 km SE of Hōlualoa, Hawaii, United States10-17 06:47
  23. 2.168 km SE of Hōlualoa, Hawaii, United States10-25 06:17
  24. 2.167 km SE of Hōlualoa, Hawaii, United States10-16 07:46
  25. 2.169 km SE of Hōlualoa, Hawaii, United States10-22 10:10

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id hv75044597. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · HV (usgs:hv75044597). Cite as: SeismoAtlas, “M2.8 earthquake 69 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75044597-m2-8-earthquake-69-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75044597. SeismoAtlas is not an official warning service.