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SeismoAtlas

M2.1 earthquake 67 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.1 earthquake struck 67 km SE of Hōlualoa, Hawaii, United States at 20:47 local time (06:47 UTC) on 16 Oct 2026, at a depth of 32 km, according to USGS.

revised from M2.3

Data: USGS · updated 2026-10-20 22:49 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
revised from 2.3
Depth
31.7 km
Status
Reviewed
Origin time
2026-10-17 06:47:14 UTC
Local: 16 Oct 2026, 20:47:14 (Pacific/Honolulu)
Epicentre
19.204° N, 155.486° 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. 8,53867 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40469 kmINot felt
HiloHawaii, United States · pop. 43,26372 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 Survey2.1 mlwas 2.331.7 km19.20° N, 155.49° W–Reviewed · 1 revision

How big was it?

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

It released roughly the energy of 21 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 32 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.1 releases about 31× the energy of M1.1, and its waves are about 9.8× taller on a seismogram. Energy: 21 kg of TNT vs 674 g of TNT.

Each square is the energy of one M1.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

226 later earthquakes within 30 km; the largest was M3.3 20 days ago. 83 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.911.431
3.331.729
3.611.129
4.601.728
5.781.89
7.751.50
9.201.433
12.552.131
12.611.10
14.111.80
16.131.831
26.141.729
34.991.70
35.691.930
37.543.0-1
42.002.339
45.341.929
46.881.830
48.461.99
54.561.833
56.761.731
62.851.38
63.241.931
69.482.1-1
69.962.337
72.391.930
73.481.929
78.761.828
78.931.931
81.742.834
89.982.345
93.541.730
103.381.234
110.141.929
122.781.632
122.841.829
123.382.132
123.921.829
126.441.933
126.671.935
127.041.935
127.231.835
130.171.735
131.521.733
132.751.50
132.752.7-1
135.362.22
135.471.830
141.731.75
142.941.840
145.041.831
150.132.030
151.482.229
152.031.829
153.093.329
154.652.032
154.951.631
155.051.130
156.991.428
159.001.9-1
159.831.82
160.511.830
164.681.86
164.701.97
169.651.949
185.311.936
185.421.940
186.581.99
187.402.133
188.241.928
191.271.847
191.512.132
195.802.339
202.951.228
204.001.830
208.901.740
210.501.931
212.301.731
214.491.832
222.762.129
230.001.828
232.051.829
235.651.830
236.981.831
244.821.732
248.722.133
249.641.931
251.211.731
252.052.530
255.001.733
257.131.230
264.271.729
264.281.833
270.061.233
272.361.828
273.211.829
274.721.828
278.281.78
285.611.832
285.662.026
286.651.831
288.431.929
296.642.232
298.391.830
306.501.930
310.071.91
310.082.733
320.561.830
321.351.930
322.021.832
323.931.838
325.161.928
325.241.332
326.801.730
329.351.832
330.682.132
334.181.830
337.251.931
337.272.00
338.541.79
338.591.930
340.051.932
340.101.829
340.291.430
340.391.934
341.051.636
341.092.130
343.891.92
346.181.71
356.221.846
356.222.052
359.751.932
359.881.930
361.982.432
362.281.728
362.831.828
368.791.913
371.171.827
371.521.829
374.221.829
377.111.67
378.211.331
390.041.829
391.441.726
392.881.831
392.911.732
401.761.927
405.101.726
414.751.829
418.041.731
422.051.97
429.611.729
429.921.931
430.542.02
431.322.440
434.351.329
440.411.828
447.213.1-2
447.631.8-2
451.882.132
453.671.933
453.841.829
457.791.77
460.571.731
461.631.76
463.321.830
469.251.739
471.251.732
480.771.529
480.891.830
481.431.733
486.712.441
486.711.923
487.082.028
492.751.729
494.551.60
498.641.928
504.801.830
510.541.930
511.301.93
513.031.928
513.511.730
515.761.929
518.291.329
519.641.930
519.901.928
521.102.18
522.721.933
526.781.842
533.871.911
538.071.831
538.761.929
543.281.932
550.231.736
550.231.935
550.242.344
550.512.040
550.822.612
551.011.713
556.872.531
556.922.231
565.931.929
571.042.629
572.511.929
574.241.732
576.221.930
580.132.131
581.271.736
581.701.829
582.081.931
586.351.732
586.931.829
590.281.827
590.391.930
600.601.530
602.281.727
603.061.727
617.601.929
621.731.731
625.951.931
633.331.828
634.861.928
635.161.736
635.982.129
636.502.629
638.071.729
  1. 3.369 km SE of Hōlualoa, Hawaii, United States10-23 15:52
  2. 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
  3. 3.056 km SSE of Hōlualoa, Hawaii, United States10-18 20:19
  4. 2.875 km SW of Hawaiian Paradise Park, United States10-20 16:31
  5. 2.771 km SW of Hawaiian Paradise Park, United States10-30 04:52
  6. 2.742 km ESE of Hōlualoa, Hawaii, United States10-22 19:32
  7. 2.667 km SE of Hōlualoa, Hawaii, United States11-12 19:17
  8. 2.672 km SE of Hōlualoa, Hawaii, United States11-09 05:36
  9. 2.661 km SW of Hawaiian Paradise Park, United States11-10 01:49
  10. 2.566 km SE of Hōlualoa, Hawaii, United States10-27 18:50
  11. 2.567 km SE of Hōlualoa, Hawaii, United States11-09 11:39
  12. 2.442 km ESE of Hōlualoa, Hawaii, United States11-04 06:06
  13. 2.468 km SE of Hōlualoa, Hawaii, United States11-01 08:46
  14. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  15. 2.343 km ESE of Hōlualoa, Hawaii, United States10-19 00:47
  16. 2.342 km ESE of Hōlualoa, Hawaii, United States10-25 10:34
  17. 2.339 km ESE of Hōlualoa, Hawaii, United States10-21 00:46
  18. 2.374 km SW of Hawaiian Paradise Park, United States10-20 04:45
  19. 2.368 km SE of Hōlualoa, Hawaii, United States11-09 05:01
  20. 2.270 km SE of Hōlualoa, Hawaii, United States10-23 14:16
  21. 2.268 km SE of Hōlualoa, Hawaii, United States10-29 15:25
  22. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  23. 2.243 km SW of Hawaiian Paradise Park, United States10-22 22:08
  24. 2.168 km SE of Hōlualoa, Hawaii, United States10-27 15:30
  25. 2.169 km SE of Hōlualoa, Hawaii, United States10-25 02:11

Did you feel it?

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Reports on SeismoAtlas

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Event id hv75059521. First recorded here 17 Oct 2026, 06:51:24 UTC. Solutions: USGS · HV (usgs:hv75059521). Cite as: SeismoAtlas, “M2.1 earthquake 67 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75059521-m2-1-earthquake-67-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75059521. SeismoAtlas is not an official warning service.