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SeismoAtlas

M2.1 earthquake 42 km ESE of Hōlualoa, Hawaii, United States

A magnitude 2.1 earthquake struck 42 km ESE of Hōlualoa, Hawaii, United States at 18:16 local time (04:16 UTC) on 19 Oct 2026, at a depth of -1 km, according to USGS.

Data: USGS · updated 2026-10-20 19:01 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
Depth
-1 km
Status
Reviewed
Origin time
2026-10-20 04:16:13 UTC
Local: 19 Oct 2026, 18:16:13 (Pacific/Honolulu)
Epicentre
19.421° N, 155.609° 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. 8,53842 kmINot felt
Kailua-KonaHawaii, United States · pop. 11,97548 kmINot felt
HiloHawaii, United States · pop. 43,26364 kmINot felt
HonoluluHawaii, United States · pop. 350,964315 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. Likely felt out to about 6 km.

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 ml-1 km19.42° N, 155.61° W–Reviewed

How big was it?

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

It released roughly the energy of 19 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 -1 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 28× the energy of M1.1, and its waves are about 9.1× taller on a seismogram. Energy: 19 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

97 later earthquakes within 30 km; the largest was M3.1 8 days ago. 44 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.911.930
4.001.929
20.502.345
24.061.730
25.111.713
40.661.929
45.522.235
53.902.132
56.301.710
63.261.50
63.272.7-1
72.251.75
80.041.83
82.551.829
87.511.428
91.021.830
95.191.86
95.221.97
97.622.3-1
117.101.99
117.922.133
118.761.928
121.791.847
122.032.132
126.312.339
134.511.830
141.021.931
142.821.731
153.282.129
162.571.829
166.171.830
167.501.831
175.712.49
179.242.133
182.572.530
187.022.60
200.581.233
205.231.828
208.791.78
227.162.232
251.871.930
259.861.832
261.202.132
267.782.00
270.811.430
274.061.62
274.101.92
274.351.72
276.701.71
290.401.930
292.502.432
304.270.83
307.621.67
308.731.331
326.472.122
352.571.97
358.441.112
361.842.440
364.861.329
377.733.1-2
378.151.8-2
384.191.933
388.311.77
392.151.76
393.841.830
401.771.732
411.411.830
414.552.473
417.232.441
417.231.923
425.071.60
429.151.928
430.062.117
441.061.930
441.821.93
442.451.950
443.551.928
444.031.730
448.811.329
450.161.930
451.622.18
453.231.933
460.982.50
467.292.415
487.382.531
487.442.231
506.731.930
516.871.732
517.441.829
520.801.827
520.911.930
531.111.530
532.281.70
548.111.929
556.471.931
565.371.928
567.012.231
  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. 2.567 km SE of Hōlualoa, Hawaii, United States11-09 11:39
  7. 2.442 km ESE of Hōlualoa, Hawaii, United States11-04 06:06
  8. 2.468 km SE of Hōlualoa, Hawaii, United States11-01 08:46
  9. 2.435 km SSE of Hōlualoa, Hawaii, United States11-08 15:33
  10. 2.429 km SSE of Hōlualoa, Hawaii, United States11-06 10:48
  11. 2.439 km ESE of Hōlualoa, Hawaii, United States10-27 11:58
  12. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  13. 2.342 km ESE of Hōlualoa, Hawaii, United States10-25 10:34
  14. 2.339 km ESE of Hōlualoa, Hawaii, United States10-21 00:46
  15. 2.348 km WSW of Hilo, Hawaii, United States10-24 05:53
  16. 2.268 km SE of Hōlualoa, Hawaii, United States10-29 15:25
  17. 2.267 km SE of Hōlualoa, Hawaii, United States11-12 19:17
  18. 2.238 km ESE of Hōlualoa, Hawaii, United States10-22 01:47
  19. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  20. 2.168 km SE of Hōlualoa, Hawaii, United States10-27 15:30
  21. 2.169 km SE of Hōlualoa, Hawaii, United States10-25 02:11
  22. 2.167 km SE of Hōlualoa, Hawaii, United States10-31 01:28
  23. 2.117 km SE of Hōlualoa, Hawaii, United States11-02 18:44
  24. 2.168 km SE of Hōlualoa, Hawaii, United States10-26 13:32
  25. 2.152 km WSW of Hawaiian Paradise Park, United States11-07 23:53

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 hv75061151. First recorded here 20 Oct 2026, 19:02:34 UTC. Solutions: USGS · HV (usgs:hv75061151). Cite as: SeismoAtlas, “M2.1 earthquake 42 km ESE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75061151-m2-1-earthquake-42-km-ese-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75061151. SeismoAtlas is not an official warning service.