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M2.3 earthquake 39 km ESE of Hōlualoa, Hawaii, United States

A magnitude 2.3 earthquake struck 39 km ESE of Hōlualoa, Hawaii, United States at 14:46 local time (00:46 UTC) on 20 Oct 2026, at a depth of 45 km, according to USGS.

Data: USGS · updated 2026-10-21 01:05 UTC · reviewed

Magnitude
2.3micro
local magnitude (Richter) (ml)
Depth
45 km
Status
Reviewed
Origin time
2026-10-21 00:46:15 UTC
Local: 20 Oct 2026, 14:46:15 (Pacific/Honolulu)
Epicentre
19.428° N, 155.637° 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. 8,53839 kmINot felt
Kailua-KonaHawaii, United States · pop. 11,97545 kmINot felt
HiloHawaii, United States · pop. 43,26366 kmINot felt
HonoluluHawaii, United States · pop. 350,964312 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 Survey2.3 mlwas 2.345 km19.43° N, 155.64° 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 46 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 45 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.3 releases about 34× the energy of M1.3, and its waves are about 10× taller on a seismogram. Energy: 46 kg of TNT vs 1 kg of TNT.

Each square is the energy of one M1.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

63 later earthquakes within 30 km; the largest was M3.1 8 days ago. 27 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.561.730
4.611.713
20.161.929
25.022.235
35.801.710
42.761.50
42.772.7-1
51.751.75
59.541.83
62.051.829
70.521.830
74.691.86
74.721.97
77.122.3-1
96.601.99
101.291.847
105.812.339
155.212.49
162.062.530
166.522.60
180.081.233
184.731.828
188.291.78
239.361.832
240.702.132
253.561.62
253.601.92
253.851.72
256.201.71
283.770.83
287.121.67
305.972.122
332.071.97
337.941.112
341.342.440
357.233.1-2
357.651.8-2
367.811.77
371.651.76
381.271.732
390.911.830
394.052.473
396.722.441
396.731.923
404.561.60
408.651.928
409.562.117
420.561.930
421.311.93
421.951.950
423.051.928
429.651.930
431.112.18
440.482.50
446.792.415
466.942.231
486.231.930
500.301.827
510.611.530
511.781.70
527.611.929
535.971.931
544.871.928
  1. 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
  2. 2.742 km ESE of Hōlualoa, Hawaii, United States10-22 19:32
  3. 2.646 km WSW of Hilo, Hawaii, United States10-27 23:17
  4. 2.566 km SE of Hōlualoa, Hawaii, United States10-27 18:50
  5. 2.547 km SW of Hilo, Hawaii, United States11-08 09:14
  6. 2.442 km ESE of Hōlualoa, Hawaii, United States11-04 06:06
  7. 2.435 km SSE of Hōlualoa, Hawaii, United States11-08 15:33
  8. 2.429 km SSE of Hōlualoa, Hawaii, United States11-06 10:48
  9. 2.439 km ESE of Hōlualoa, Hawaii, United States10-27 11:58
  10. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  11. 2.342 km ESE of Hōlualoa, Hawaii, United States10-25 10:34
  12. 2.348 km WSW of Hilo, Hawaii, United States10-24 05:53
  13. 2.238 km ESE of Hōlualoa, Hawaii, United States10-22 01:47
  14. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  15. 2.167 km SE of Hōlualoa, Hawaii, United States10-31 01:28
  16. 2.117 km SE of Hōlualoa, Hawaii, United States11-02 18:44
  17. 2.152 km WSW of Hawaiian Paradise Park, United States11-07 23:53
  18. 2.128 km SSE of Hōlualoa, Hawaii, United States11-07 02:20
  19. 1.964 km SW of Hawaiian Paradise Park, United States11-12 17:38
  20. 1.966 km SE of Hōlualoa, Hawaii, United States10-25 01:22
  21. 1.951 km ESE of Hōlualoa, Hawaii, United States11-03 20:50
  22. 1.941 km ESE of Hōlualoa, Hawaii, United States11-07 14:43
  23. 1.967 km SE of Hōlualoa, Hawaii, United States11-07 15:49
  24. 1.967 km SE of Hōlualoa, Hawaii, United States11-12 08:44
  25. 1.957 km SW of Hawaiian Paradise Park, United States11-07 22:25

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.

Event id hv75061531. First recorded here 21 Oct 2026, 00:50:14 UTC. Solutions: USGS · HV (usgs:hv75061531). Cite as: SeismoAtlas, “M2.3 earthquake 39 km ESE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75061531-m2-3-earthquake-39-km-ese-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75061531. SeismoAtlas is not an official warning service.