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M1.8 earthquake 61 km SW of Hawaiian Paradise Park, United States

A magnitude 1.8 earthquake struck 61 km SW of Hawaiian Paradise Park, United States at 09:38 local time (19:38 UTC) on 23 Sept 2026, at a depth of 30 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-23 19:42 UTC · automatic solution

Magnitude
1.8micro
duration magnitude (md)
Depth
29.9 km
Status
Automatic
Origin time
2026-09-23 19:38:57 UTC
Local: 23 Sept 2026, 09:38:57 (Pacific/Honolulu)
Epicentre
19.198° N, 155.378° 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
Hawaiian Paradise ParkHawaii, United States · pop. 11,40461 kmINot felt
HiloHawaii, United States · pop. 43,26366 kmINot felt
HonoluluHawaii, United States · pop. 350,964349 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · HVheadlineHawaiian Volcano Observatory via U.S. Geological Survey1.8 md29.9 km19.20° N, 155.38° W–Automatic

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How big was it?

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

It released roughly the energy of 8 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 30 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 18× the energy of M1.0, and its waves are about 6.8× taller on a seismogram. Energy: 8 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

61 later earthquakes within 30 km; the largest was M2.8 17 h ago. 35 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.161.632
3.221.928
3.471.932
4.612.232
5.081.630
7.042.133
7.191.830
10.101.533
13.151.836
18.711.838
19.881.831
23.812.129
25.622.00
26.892.05
26.971.731
27.321.232
30.251.79
30.551.830
33.211.927
34.411.830
37.312.42
37.321.935
37.781.730
38.132.228
39.571.612
49.371.81
50.472.22
50.761.92
55.711.831
58.911.729
67.781.930
68.392.08
69.671.830
72.042.136
72.052.632
76.562.20
76.932.031
81.361.02
82.321.80
85.901.74
86.011.930
86.511.827
94.321.910
97.021.928
100.711.729
102.712.129
107.981.727
110.692.132
110.961.732
111.942.835
111.992.133
112.302.433
112.721.830
112.882.134
113.102.333
113.251.732
113.802.333
122.642.332
123.761.833
123.812.037
126.521.833
  1. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  2. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  3. 2.439 km SW of Hawaiian Paradise Park, United States09-25 08:57
  4. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  5. 2.368 km SW of Hawaiian Paradise Park, United States09-28 22:17
  6. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  7. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  8. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  9. 2.276 km SW of Hawaiian Paradise Park, United States09-24 00:15
  10. 2.239 km SW of Hawaiian Paradise Park, United States09-25 22:07
  11. 2.237 km SW of Hawaiian Paradise Park, United States09-27 00:12
  12. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27
  13. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  14. 2.172 km SE of Hōlualoa, Hawaii, United States09-28 11:38
  15. 2.164 km SW of Hawaiian Paradise Park, United States09-28 02:21
  16. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 10:20
  17. 2.171 km SE of Hōlualoa, Hawaii, United States09-24 02:41
  18. 2.166 km SE of Hōlualoa, Hawaii, United States09-26 19:41
  19. 2.038 km WSW of Hawaiian Paradise Park, United States09-24 21:16
  20. 2.052 km SW of Hawaiian Paradise Park, United States09-24 22:32
  21. 2.057 km ESE of Hōlualoa, Hawaii, United States09-26 16:02
  22. 2.069 km SE of Hōlualoa, Hawaii, United States09-28 23:27
  23. 2.067 km SE of Hōlualoa, Hawaii, United States09-27 00:34
  24. 1.967 km SE of Hōlualoa, Hawaii, United States09-23 22:52
  25. 1.969 km SE of Hōlualoa, Hawaii, United States09-23 23:07

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Reports on SeismoAtlas

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Event id hv75042822. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · HV (usgs:hv75042822). Cite as: SeismoAtlas, “M1.8 earthquake 61 km SW of Hawaiian Paradise Park, United States”, https://seismoatlas.com/earthquake/hv75042822-m1-8-earthquake-61-km-sw-of-hawaiian-paradise-park-united-states, data from USGS.

JSON: /api/v1/events/hv75042822. SeismoAtlas is not an official warning service.