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SeismoAtlas

M2.1 earthquake 70 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.1 earthquake struck 70 km SE of Hōlualoa, Hawaii, United States at 08:21 local time (18:21 UTC) on 22 Sept 2026, at a depth of 31 km, according to USGS.

Data: USGS · updated 2026-09-23 19:44 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
Depth
31.4 km
Status
Reviewed
Origin time
2026-09-22 18:21:01 UTC
Local: 22 Sept 2026, 08:21:01 (Pacific/Honolulu)
Epicentre
19.164° N, 155.495° 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. 8,53870 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40473 kmINot felt
HiloHawaii, United States · pop. 43,26376 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 ml31.4 km19.16° 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 24 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.

M2.1 releases about 35× the energy of M1.1, and its waves are about 11× taller on a seismogram. Energy: 24 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

248 later earthquakes within 30 km; the largest was M3.6 38 days ago. 15 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.282.032
1.161.928
3.961.930
11.821.928
15.001.811
16.241.928
16.302.031
17.331.629
19.112.610
20.021.810
22.491.629
22.591.726
22.612.033
23.081.728
23.241.829
23.251.728
25.301.830
27.461.632
28.521.928
28.771.932
29.912.232
30.381.630
32.342.133
32.491.830
35.401.533
38.451.836
45.171.831
49.112.129
52.192.05
52.271.731
52.621.232
55.551.79
55.851.830
58.511.927
59.711.830
62.621.935
63.081.730
63.422.228
64.871.612
79.891.610
81.011.831
84.211.729
93.081.930
93.692.08
94.971.830
97.332.136
97.352.636
102.232.031
111.311.930
111.811.827
119.621.910
122.321.928
126.011.729
128.012.130
133.281.727
135.991.334
136.261.732
137.242.835
137.291.535
137.601.935
138.021.830
138.182.134
138.401.835
138.551.732
139.101.735
147.942.332
149.061.833
149.112.037
151.821.833
158.341.932
160.461.827
163.311.733
172.921.726
173.461.96
174.351.931
176.311.728
188.692.631
194.961.66
199.701.86
204.011.727
207.771.830
211.262.530
212.262.041
213.561.933
213.901.431
219.001.932
220.141.930
222.581.832
223.181.927
224.101.930
224.782.339
226.941.934
235.281.815
238.571.832
238.701.932
239.091.929
241.081.529
243.001.730
243.081.834
243.431.731
245.331.729
248.661.80
251.681.831
256.981.533
260.011.830
263.432.127
265.121.832
272.771.732
274.911.829
275.761.633
275.791.610
283.351.728
283.661.829
286.651.829
288.491.931
291.581.727
297.031.632
302.671.910
304.011.830
305.931.830
306.183.628
320.531.843
333.531.19
333.541.929
338.481.934
339.111.827
340.101.633
343.491.832
343.581.833
350.531.829
351.711.68
354.211.831
363.951.732
364.711.933
372.481.827
374.802.261
380.621.948
380.701.950
380.781.82
385.471.929
385.931.928
386.232.032
388.461.727
388.541.829
392.131.927
418.681.732
421.141.631
422.151.133
426.731.731
427.791.928
431.611.828
442.451.828
448.431.741
459.121.928
461.941.830
468.961.833
469.101.811
471.351.740
472.331.730
478.221.830
478.671.931
482.011.631
482.591.733
486.471.440
490.681.734
493.021.829
498.472.049
499.611.927
500.131.734
501.031.733
503.511.832
504.911.930
505.451.635
506.171.934
507.372.034
508.991.934
510.262.232
510.771.930
518.352.027
521.441.80
524.841.930
527.441.428
527.571.728
527.681.933
529.351.737
535.810.92
535.822.227
535.841.729
540.262.433
546.021.935
555.181.735
555.881.835
557.391.845
561.831.828
564.001.829
564.671.830
565.432.10
567.911.831
569.611.89
575.151.833
579.501.434
581.321.731
581.691.77
582.332.134
584.111.70
584.902.031
588.442.132
591.351.431
591.771.729
592.051.129
593.041.728
594.211.89
596.191.50
597.641.433
600.081.914
600.992.131
601.051.10
604.561.831
614.581.729
619.301.829
624.131.930
625.983.0-1
633.781.929
635.321.830
636.891.99
643.001.833
645.201.731
651.291.38
651.681.931
658.402.337
660.831.930
661.921.929
667.201.828
667.371.931
670.172.834
681.981.730
691.821.234
698.581.929
711.221.632
711.271.829
711.822.132
712.351.829
714.881.933
715.111.935
715.471.935
715.661.835
718.611.735
719.951.733
  1. 3.643 km SW of Hawaiian Paradise Park, United States10-05 12:31
  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. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  5. 2.655 km SW of Hawaiian Paradise Park, United States09-30 15:02
  6. 2.655 km SW of Hawaiian Paradise Park, United States09-26 19:41
  7. 2.671 km SE of Hōlualoa, Hawaii, United States09-23 13:27
  8. 2.568 km SE of Hōlualoa, Hawaii, United States10-01 13:36
  9. 2.469 km SE of Hōlualoa, Hawaii, United States10-15 06:36
  10. 2.368 km SW of Hawaiian Paradise Park, United States09-28 22:17
  11. 2.373 km SSE of Hōlualoa, Hawaii, United States10-02 03:08
  12. 2.374 km SW of Hawaiian Paradise Park, United States10-20 04:45
  13. 2.261 km SSE of Hōlualoa, Hawaii, United States10-08 09:08
  14. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  15. 2.276 km SW of Hawaiian Paradise Park, United States09-24 00:15
  16. 2.266 km SW of Hawaiian Paradise Park, United States10-14 00:36
  17. 2.264 km SW of Hawaiian Paradise Park, United States10-15 02:10
  18. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27
  19. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  20. 2.173 km SW of Hawaiian Paradise Park, United States10-03 17:47
  21. 2.169 km SE of Hōlualoa, Hawaii, United States10-17 00:40
  22. 2.177 km SW of Hawaiian Paradise Park, United States10-17 19:20
  23. 2.167 km SE of Hōlualoa, Hawaii, United States10-17 06:47
  24. 2.171 km SE of Hōlualoa, Hawaii, United States09-24 02:41
  25. 2.164 km SW of Hawaiian Paradise Park, United States09-28 02:21

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Event id hv75042002. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · HV (usgs:hv75042002). Cite as: SeismoAtlas, “M2.1 earthquake 70 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75042002-m2-1-earthquake-70-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75042002. SeismoAtlas is not an official warning service.