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M1.7 earthquake 51 km ESE of Hōlualoa, Hawaii, United States

A magnitude 1.7 earthquake struck 51 km ESE of Hōlualoa, Hawaii, United States at 11:03 local time (21:03 UTC) on 28 Oct 2026, at a depth of 8 km, according to USGS.

revised from M2.3

Data: USGS · updated 2026-10-29 00:22 UTC · reviewed

Magnitude
1.7micro
local magnitude (Richter) (ml)
revised from 2.3
Depth
7.8 km
Status
Reviewed
Origin time
2026-10-28 21:03:48 UTC
Local: 28 Oct 2026, 11:03:48 (Pacific/Honolulu)
Epicentre
19.441° N, 155.499° 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. 8,53851 kmINot felt
HiloHawaii, United States · pop. 43,26354 kmINot felt
HonoluluHawaii, United States · pop. 350,964322 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 Survey1.7 mlwas 2.37.8 km19.44° N, 155.50° 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 6 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 8 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.7 releases about 12× the energy of M1.0, and its waves are about 5.4× taller on a seismogram. Energy: 6 kg of TNT vs 477 g of TNT.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

75 later earthquakes within 30 km; the largest was M3.1 8 days ago. 43 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
10.151.929
18.372.232
28.231.930
43.081.930
51.071.832
52.402.132
58.992.00
60.271.79
61.821.829
62.021.430
65.271.62
65.311.92
65.551.72
65.621.92
67.901.71
74.441.72
74.452.22
81.611.930
83.712.432
95.470.83
98.831.67
99.931.331
110.222.02
111.761.829
113.171.726
139.761.731
143.771.97
151.641.931
152.262.02
153.042.440
156.071.329
168.943.1-2
169.361.8-2
179.521.77
183.361.76
185.041.830
192.981.732
202.491.529
202.611.830
208.432.441
208.431.923
208.802.028
216.271.60
220.361.928
232.271.930
233.021.93
233.661.950
234.761.928
235.231.730
237.491.929
240.011.329
241.361.930
242.822.18
244.441.933
252.192.50
278.592.531
278.652.231
295.971.732
297.941.930
303.421.829
303.801.931
308.081.732
308.651.829
312.011.827
312.121.930
322.321.530
336.091.93
339.321.929
347.681.931
356.581.928
357.712.129
358.222.231
359.791.729
364.032.58
364.121.930
  1. 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
  2. 2.547 km SW of Hilo, Hawaii, United States11-08 09:14
  3. 2.567 km SE of Hōlualoa, Hawaii, United States11-09 11:39
  4. 2.553 km SW of Hilo, Hawaii, United States11-13 01:05
  5. 2.442 km ESE of Hōlualoa, Hawaii, United States11-04 06:06
  6. 2.468 km SE of Hōlualoa, Hawaii, United States11-01 08:46
  7. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  8. 2.268 km SE of Hōlualoa, Hawaii, United States10-29 15:25
  9. 2.267 km SE of Hōlualoa, Hawaii, United States11-12 19:17
  10. 2.239 km SW of Hawaiian Paradise Park, United States10-31 23:31
  11. 2.267 km SE of Hōlualoa, Hawaii, United States11-09 11:42
  12. 2.167 km SE of Hōlualoa, Hawaii, United States10-31 01:28
  13. 2.158 km SW of Hawaiian Paradise Park, United States11-12 18:46
  14. 2.152 km WSW of Hawaiian Paradise Park, United States11-07 23:53
  15. 2.067 km SW of Hawaiian Paradise Park, United States10-31 08:03
  16. 2.058 km SW of Hawaiian Paradise Park, United States11-06 13:51
  17. 2.039 km SW of Hawaiian Paradise Park, United States11-02 11:16
  18. 2.040 km SW of Hawaiian Paradise Park, United States11-04 05:19
  19. 1.964 km SW of Hawaiian Paradise Park, United States11-12 17:38
  20. 1.951 km ESE of Hōlualoa, Hawaii, United States11-03 20:50
  21. 1.941 km ESE of Hōlualoa, Hawaii, United States11-07 14:43
  22. 1.967 km SE of Hōlualoa, Hawaii, United States11-07 15:49
  23. 1.939 km SW of Hawaiian Paradise Park, United States10-31 14:40
  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 hv75065066. First recorded here 28 Oct 2026, 21:08:18 UTC. Solutions: USGS · HV (usgs:hv75065066). Cite as: SeismoAtlas, “M1.7 earthquake 51 km ESE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75065066-m1-7-earthquake-51-km-ese-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75065066. SeismoAtlas is not an official warning service.