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SeismoAtlas

M2.1 earthquake 69 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.1 earthquake struck 69 km SE of Hōlualoa, Hawaii, United States at 14:40 local time (00:40 UTC) on 16 Oct 2026, at a depth of 34 km, according to USGS.

revised from M2.3

Data: USGS · updated 2026-10-20 22:07 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
revised from 2.3
Depth
33.6 km
Status
Reviewed
Origin time
2026-10-17 00:40:40 UTC
Local: 16 Oct 2026, 14:40:40 (Pacific/Honolulu)
Epicentre
19.163° N, 155.506° 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
Hawaiian Paradise ParkHawaii, United States · pop. 11,40474 kmINot felt
HiloHawaii, United States · pop. 43,26377 kmINot felt
HonoluluHawaii, United States · pop. 350,964343 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 2.333.6 km19.16° N, 155.51° 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 22 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 34 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 33× the energy of M1.1, and its waves are about 10× taller on a seismogram. Energy: 22 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

216 later earthquakes within 30 km; the largest was M3.3 20 days ago. 56 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.781.70
2.582.031
6.112.132
9.021.431
9.441.729
9.721.129
10.711.728
11.891.89
13.861.50
15.311.433
17.761.914
18.662.131
18.721.10
22.241.831
32.251.729
36.971.829
41.801.930
43.653.0-1
51.451.929
52.991.830
54.571.99
60.671.833
62.871.731
68.961.38
69.351.931
76.072.337
78.501.930
79.591.929
84.871.828
85.041.931
87.852.834
99.651.730
109.491.234
116.251.929
128.891.632
128.951.829
129.492.132
130.021.829
132.551.933
132.781.935
133.151.935
133.341.835
136.281.735
137.631.733
141.581.830
147.841.75
149.051.840
151.151.831
156.242.030
157.592.229
158.141.829
159.203.329
160.762.032
161.061.631
161.161.130
163.101.428
165.111.9-1
166.611.830
170.791.86
170.811.97
175.761.949
191.411.936
191.531.940
192.691.99
193.512.133
194.351.928
197.381.847
197.622.132
209.061.228
210.111.830
215.011.740
216.611.931
218.411.731
220.601.832
228.872.129
236.111.828
238.161.829
241.761.830
243.091.831
250.931.732
254.832.133
255.751.931
257.321.731
258.162.530
261.111.733
263.241.230
270.381.729
270.391.833
276.171.233
278.471.828
279.321.829
280.831.828
291.721.832
291.772.026
292.761.831
294.541.929
302.752.232
304.501.830
312.611.930
316.192.733
326.661.830
327.461.930
328.131.832
330.041.838
331.271.928
331.351.332
332.911.730
335.461.832
336.792.132
340.291.830
343.361.931
343.382.00
344.651.79
344.701.930
346.151.932
346.211.829
346.401.430
346.501.934
347.161.636
347.202.130
352.291.71
362.331.846
362.332.052
365.861.932
365.991.930
368.092.432
368.391.728
368.941.828
374.901.913
377.281.827
377.631.829
380.331.829
383.221.67
384.321.331
396.141.829
397.551.726
398.991.831
399.021.732
407.871.927
411.201.726
420.861.829
424.151.731
435.721.729
436.031.931
440.461.329
446.521.828
453.323.1-2
453.741.8-2
457.992.132
459.781.933
459.941.829
463.901.77
466.681.731
467.741.76
469.431.830
475.361.739
477.361.732
486.881.529
487.001.830
487.531.733
492.821.923
493.192.028
498.861.729
504.741.928
510.911.830
516.361.917
516.651.930
517.411.93
519.141.928
519.621.730
521.871.929
524.401.329
525.751.930
526.011.928
527.212.18
528.821.933
532.891.842
539.981.911
540.571.937
544.181.831
544.871.929
549.391.932
556.341.736
556.341.935
556.352.344
556.622.040
556.932.612
557.121.713
562.972.531
563.032.231
563.081.834
572.041.929
577.152.629
578.621.929
580.351.732
582.321.930
586.242.131
587.381.736
587.811.829
588.191.931
592.461.732
593.041.829
596.391.827
596.501.930
606.712.127
608.392.024
609.171.727
623.711.929
627.831.731
632.062.129
639.441.828
640.972.029
641.272.235
642.092.329
642.612.629
644.181.729
  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. 2.667 km SE of Hōlualoa, Hawaii, United States11-12 19:17
  7. 2.672 km SE of Hōlualoa, Hawaii, United States11-09 05:36
  8. 2.661 km SW of Hawaiian Paradise Park, United States11-10 01:49
  9. 2.566 km SE of Hōlualoa, Hawaii, United States10-27 18:50
  10. 2.567 km SE of Hōlualoa, Hawaii, United States11-09 11:39
  11. 2.468 km SE of Hōlualoa, Hawaii, United States11-01 08:46
  12. 2.374 km SW of Hawaiian Paradise Park, United States10-20 04:45
  13. 2.358 km SW of Hawaiian Paradise Park, United States11-12 18:46
  14. 2.368 km SE of Hōlualoa, Hawaii, United States11-09 05:01
  15. 2.270 km SE of Hōlualoa, Hawaii, United States10-23 14:16
  16. 2.268 km SE of Hōlualoa, Hawaii, United States10-29 15:25
  17. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  18. 2.270 km SE of Hōlualoa, Hawaii, United States11-12 17:57
  19. 2.168 km SE of Hōlualoa, Hawaii, United States10-27 15:30
  20. 2.169 km SE of Hōlualoa, Hawaii, United States10-25 02:11
  21. 2.167 km SE of Hōlualoa, Hawaii, United States10-31 01:28
  22. 2.165 km SE of Hōlualoa, Hawaii, United States11-12 08:44
  23. 2.177 km SW of Hawaiian Paradise Park, United States10-17 19:20
  24. 2.174 km SW of Hawaiian Paradise Park, United States11-10 10:55
  25. 2.168 km SE of Hōlualoa, Hawaii, United States10-26 13:32

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Reports on SeismoAtlas

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Event id hv75059406. First recorded here 17 Oct 2026, 00:45:10 UTC. Solutions: USGS · HV (usgs:hv75059406). Cite as: SeismoAtlas, “M2.1 earthquake 69 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75059406-m2-1-earthquake-69-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75059406. SeismoAtlas is not an official warning service.