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M1.8 earthquake 46 km SW of Hilo, Hawaii, United States

A magnitude 1.8 earthquake struck 46 km SW of Hilo, Hawaii, United States at 02:18 local time (12:18 UTC) on 23 Oct 2026, at a depth of 3 km, according to USGS.

Data: USGS · updated 2026-10-23 18:18 UTC · reviewed

Magnitude
1.8micro
local magnitude (Richter) (ml)
Depth
3.4 km
Status
Reviewed
Origin time
2026-10-23 12:18:44 UTC
Local: 23 Oct 2026, 02:18:44 (Pacific/Honolulu)
Epicentre
19.485° N, 155.446° 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
HiloHawaii, United States · pop. 43,26346 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40451 kmINot felt
HonoluluHawaii, United States · pop. 350,964323 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 3 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 Survey1.8 mlwas 1.73.4 km19.48° N, 155.45° 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 7 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 3 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.8 releases about 14× the energy of M1.0, and its waves are about 5.9× taller on a seismogram. Energy: 7 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

66 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 M1.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.511.829
5.421.631
5.521.130
10.311.82
15.151.86
15.171.97
17.582.3-1
21.251.4-1
41.751.847
46.272.339
53.431.228
60.491.9-1
60.981.931
85.371.841
95.672.49
104.751.325
106.982.60
107.611.230
120.541.233
125.191.828
128.751.78
156.981.930
160.551.91
189.021.79
190.581.829
190.771.430
194.021.62
194.061.92
194.301.72
194.371.92
196.661.71
203.201.72
203.212.22
224.230.83
227.581.67
238.972.02
240.511.829
241.921.726
268.511.731
272.531.97
281.012.02
281.792.440
284.821.329
297.693.1-2
298.111.8-2
308.271.77
312.111.76
313.801.830
331.361.830
337.182.441
337.191.923
345.021.60
349.111.928
361.021.930
361.771.93
362.411.950
368.771.329
370.111.930
371.572.18
380.942.50
424.721.732
436.831.732
464.841.93
468.071.929
485.331.928
492.782.58
  1. 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
  2. 2.646 km WSW of Hilo, Hawaii, United States10-27 23:17
  3. 2.547 km SW of Hilo, Hawaii, United States11-08 09:14
  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. 2.439 km ESE of Hōlualoa, Hawaii, United States10-27 11:58
  7. 2.443 km ESE of Hōlualoa, Hawaii, United States11-06 13:29
  8. 2.342 km ESE of Hōlualoa, Hawaii, United States10-25 10:34
  9. 2.348 km WSW of Hilo, Hawaii, United States10-24 05:53
  10. 2.239 km SW of Hawaiian Paradise Park, United States10-31 23:31
  11. 2.152 km WSW of Hawaiian Paradise Park, United States11-07 23:53
  12. 2.039 km SW of Hawaiian Paradise Park, United States11-02 11:16
  13. 2.040 km SW of Hawaiian Paradise Park, United States11-04 05:19
  14. 1.937 km SW of Hawaiian Paradise Park, United States10-26 00:47
  15. 1.964 km SW of Hawaiian Paradise Park, United States11-12 17:38
  16. 1.951 km ESE of Hōlualoa, Hawaii, United States11-03 20:50
  17. 1.941 km ESE of Hōlualoa, Hawaii, United States11-07 14:43
  18. 1.939 km SW of Hawaiian Paradise Park, United States10-31 14:40
  19. 1.954 km SW of Hawaiian Paradise Park, United States10-26 01:17
  20. 1.957 km SW of Hawaiian Paradise Park, United States11-07 22:25
  21. 1.962 km SE of Hōlualoa, Hawaii, United States10-24 03:29
  22. 1.958 km SW of Hawaiian Paradise Park, United States10-30 01:17
  23. 1.943 km SW of Hawaiian Paradise Park, United States10-30 04:51
  24. 1.945 km WSW of Hilo, Hawaii, United States10-31 14:22
  25. 1.938 km WSW of Hawaiian Paradise Park, United States11-11 21:09

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 hv75062691. First recorded here 23 Oct 2026, 12:22:48 UTC. Solutions: USGS · HV (usgs:hv75062691). Cite as: SeismoAtlas, “M1.8 earthquake 46 km SW of Hilo, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75062691-m1-8-earthquake-46-km-sw-of-hilo-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75062691. SeismoAtlas is not an official warning service.