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SeismoAtlas

M2.1 earthquake 68 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.1 earthquake struck 68 km SE of Hōlualoa, Hawaii, United States at 05:30 local time (15:30 UTC) on 27 Oct 2026, at a depth of 33 km, according to USGS.

revised from M2.3

Data: USGS · updated 2026-10-27 21:24 UTC · reviewed

Magnitude
2.1micro
local magnitude (Richter) (ml)
revised from 2.3
Depth
33.2 km
Status
Reviewed
Origin time
2026-10-27 15:30:28 UTC
Local: 27 Oct 2026, 05:30:28 (Pacific/Honolulu)
Epicentre
19.170° N, 155.508° 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. 8,53868 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40473 kmINot felt
HiloHawaii, United States · pop. 43,26376 kmINot felt
HonoluluHawaii, United States · pop. 350,964342 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 2.333.2 km19.17° 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 25 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 33 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 27× the energy of M1.2, and its waves are about 8.9× taller on a seismogram. Energy: 25 kg of TNT vs 951 g of TNT.

Each square is the energy of one M1.2. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

137 later earthquakes within 30 km; the largest was M3.1 8 days ago. 51 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.921.931
2.491.731
3.332.530
6.281.733
8.411.230
15.551.729
15.561.833
21.341.233
23.641.828
24.491.829
26.001.828
36.891.832
36.942.026
37.931.831
39.711.929
47.922.232
49.671.830
57.781.930
61.362.733
71.831.830
72.631.930
73.301.832
75.211.838
76.441.928
76.521.332
78.081.730
80.631.832
81.962.132
85.461.830
88.531.931
88.552.00
89.821.79
89.871.930
91.321.932
91.381.829
91.571.430
91.671.934
92.331.636
92.372.130
97.461.71
107.501.846
107.502.052
111.031.932
111.161.930
113.262.432
113.561.728
114.111.828
120.071.913
122.451.827
122.801.829
125.501.829
128.391.67
129.491.331
141.311.829
142.721.726
144.161.831
144.191.732
153.041.927
156.371.726
166.031.829
169.321.731
173.331.97
180.891.729
181.201.931
185.631.329
191.691.828
198.493.1-2
198.911.8-2
203.162.132
204.951.933
205.121.829
209.071.77
211.851.731
212.911.76
214.601.830
220.531.739
222.531.732
232.051.529
232.171.830
232.701.733
237.992.441
237.991.923
238.362.028
244.031.729
249.911.928
256.081.830
261.531.917
261.821.930
262.581.93
264.311.928
264.791.730
267.041.929
269.571.329
270.921.930
271.181.928
272.382.18
274.001.933
278.061.842
285.151.911
285.741.937
289.351.831
290.041.929
294.561.932
301.511.736
301.511.935
301.522.344
301.792.040
302.102.612
302.291.713
308.142.531
308.202.231
308.251.834
317.211.929
322.322.629
323.791.929
325.521.732
327.491.930
331.412.131
332.551.736
332.981.829
333.361.931
337.631.732
338.211.829
341.561.827
341.671.930
351.881.530
353.561.727
354.341.727
368.881.929
373.001.731
377.231.931
384.611.828
386.141.928
386.441.736
387.262.129
387.782.629
389.351.729
  1. 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
  2. 2.771 km SW of Hawaiian Paradise Park, United States10-30 04:52
  3. 2.667 km SE of Hōlualoa, Hawaii, United States11-12 19:17
  4. 2.672 km SE of Hōlualoa, Hawaii, United States11-09 05:36
  5. 2.661 km SW of Hawaiian Paradise Park, United States11-10 01:49
  6. 2.566 km SE of Hōlualoa, Hawaii, United States10-27 18:50
  7. 2.567 km SE of Hōlualoa, Hawaii, United States11-09 11:39
  8. 2.468 km SE of Hōlualoa, Hawaii, United States11-01 08:46
  9. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  10. 2.368 km SE of Hōlualoa, Hawaii, United States11-09 05:01
  11. 2.268 km SE of Hōlualoa, Hawaii, United States10-29 15:25
  12. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  13. 2.167 km SE of Hōlualoa, Hawaii, United States10-31 01:28
  14. 2.158 km SW of Hawaiian Paradise Park, United States11-12 18:46
  15. 2.174 km SW of Hawaiian Paradise Park, United States11-10 10:55
  16. 2.170 km SW of Hawaiian Paradise Park, United States11-05 02:40
  17. 2.152 km WSW of Hawaiian Paradise Park, United States11-07 23:53
  18. 2.175 km SW of Hawaiian Paradise Park, United States10-31 11:52
  19. 2.067 km SW of Hawaiian Paradise Park, United States10-31 08:03
  20. 2.058 km SW of Hawaiian Paradise Park, United States11-06 13:51
  21. 2.072 km SW of Hawaiian Paradise Park, United States11-09 05:17
  22. 2.062 km SW of Hawaiian Paradise Park, United States10-29 04:27
  23. 2.056 km SSW of Hawaiian Paradise Park, United States11-01 03:00
  24. 1.969 km SW of Hawaiian Paradise Park, United States10-27 16:25
  25. 1.964 km SW of Hawaiian Paradise Park, United States11-12 17:38

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 hv75064431. First recorded here 27 Oct 2026, 15:34:04 UTC. Solutions: USGS · HV (usgs:hv75064431). Cite as: SeismoAtlas, “M2.1 earthquake 68 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75064431-m2-1-earthquake-68-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75064431. SeismoAtlas is not an official warning service.