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M2.8 earthquake 70 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.8 earthquake struck 70 km SE of Hōlualoa, Hawaii, United States at 17:28 local time (03:28 UTC) on 18 Sept 2026, at a depth of 14 km, according to USGS.

Data: USGS · updated 2026-09-19 04:05 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
13.8 km
Status
Reviewed
Origin time
2026-09-19 03:28:41 UTC
Local: 18 Sept 2026, 17:28:41 (Pacific/Honolulu)
Epicentre
19.169° N, 155.488° 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. 8,53870 kmINot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,40472 kmINot felt
HiloHawaii, United States · pop. 43,26375 kmINot felt
HonoluluHawaii, United States · pop. 350,964343 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 Survey2.8 ml13.8 km19.17° N, 155.49° W–Reviewed

How big was it?

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

It released roughly the energy of 256 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 14 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.8 releases about 34× the energy of M1.8, and its waves are about 10× taller on a seismogram. Energy: 256 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

77 later earthquakes within 30 km; the largest was M2.8 9 h ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
11.942.612
58.622.631
63.021.830
63.492.631
70.171.831
70.681.933
72.381.728
74.501.831
77.621.228
78.891.839
81.711.729
86.872.131
87.152.032
88.031.928
90.831.930
98.691.928
101.871.811
103.121.928
103.172.031
104.211.629
105.982.610
106.891.810
109.361.629
109.461.726
109.482.033
109.961.728
110.111.829
110.131.728
112.171.830
114.341.632
115.391.928
115.641.932
116.782.232
117.251.630
119.212.133
119.361.830
122.271.533
125.321.836
132.051.831
135.982.129
139.062.05
139.141.731
139.491.232
142.421.79
142.721.830
145.381.927
146.581.830
149.491.935
149.961.730
150.302.228
151.741.612
166.761.610
167.882.131
171.082.328
179.951.930
180.572.08
181.842.430
184.212.136
184.222.632
189.102.031
198.191.930
198.691.827
206.491.910
209.191.928
212.881.729
214.882.129
220.151.727
222.862.132
223.131.732
224.112.835
224.162.133
224.472.433
224.891.830
225.052.134
225.272.333
225.421.732
225.972.333
  1. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  2. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 14:06
  3. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  4. 2.671 km SE of Hōlualoa, Hawaii, United States09-19 15:24
  5. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 18:58
  6. 2.671 km SE of Hōlualoa, Hawaii, United States09-23 13:27
  7. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  8. 2.457 km SW of Hawaiian Paradise Park, United States09-26 17:19
  9. 2.369 km SE of Hōlualoa, Hawaii, United States09-26 06:33
  10. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  11. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  12. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  13. 2.276 km SW of Hawaiian Paradise Park, United States09-24 00:15
  14. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27
  15. 2.170 km SE of Hōlualoa, Hawaii, United States09-22 18:21
  16. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  17. 2.172 km SE of Hōlualoa, Hawaii, United States09-28 11:38
  18. 2.164 km SW of Hawaiian Paradise Park, United States09-28 02:21
  19. 2.167 km SW of Hawaiian Paradise Park, United States09-26 03:21
  20. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 10:20
  21. 2.171 km SE of Hōlualoa, Hawaii, United States09-24 02:41
  22. 2.166 km SE of Hōlualoa, Hawaii, United States09-26 19:41
  23. 2.067 km SE of Hōlualoa, Hawaii, United States09-23 10:38
  24. 2.052 km SW of Hawaiian Paradise Park, United States09-24 22:32
  25. 2.069 km SE of Hōlualoa, Hawaii, United States09-23 16:57

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Reports on SeismoAtlas

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Event id hv75039922. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · HV (usgs:hv75039922). Cite as: SeismoAtlas, “M2.8 earthquake 70 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75039922-m2-8-earthquake-70-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75039922. SeismoAtlas is not an official warning service.