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M2.5 earthquake 70 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.5 earthquake struck 70 km SE of Hōlualoa, Hawaii, United States at 23:26 local time (09:26 UTC) on 17 Sept 2026, at a depth of 10 km, according to USGS.

1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-18 20:59 UTC · reviewed

Magnitude
2.5micro
local magnitude (Richter) (ml)
Depth
10.5 km
Status
Reviewed
Origin time
2026-09-18 09:26:11 UTC
Local: 17 Sept 2026, 23:26:11 (Pacific/Honolulu)
Epicentre
19.165° N, 155.484° 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. 350,964344 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 Survey2.5 ml10.5 km19.16° N, 155.48° W–Reviewed

How big was it?

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

It released roughly the energy of 91 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 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.5 releases about 34× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 91 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

79 later earthquakes within 30 km; the largest was M3.0 10 days ago. 5 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.893.014
18.042.814
29.982.612
76.662.631
81.061.830
81.532.631
88.211.831
88.721.933
90.421.728
92.541.831
95.661.228
96.931.839
99.751.729
104.912.131
105.192.032
106.071.928
108.871.930
116.741.928
119.911.811
121.161.928
121.212.031
122.251.629
124.022.610
124.931.810
127.401.629
127.501.726
127.532.033
128.001.728
128.151.829
128.171.728
130.211.830
132.381.632
133.431.928
133.681.932
134.832.232
135.291.630
137.252.133
137.401.830
140.311.533
143.361.836
150.091.831
154.022.129
157.102.05
157.181.731
157.541.232
160.461.79
160.761.830
163.421.927
164.631.830
167.531.935
168.001.730
168.342.228
169.781.612
184.801.610
185.922.131
189.122.328
198.001.930
198.612.08
199.882.430
202.252.136
202.262.632
207.142.031
216.231.930
216.731.827
224.531.910
227.231.928
230.931.729
232.922.129
238.191.727
240.902.132
241.171.732
242.152.835
242.212.133
242.522.433
242.931.830
243.092.134
243.312.333
243.471.732
244.022.333
  1. 3.070 km SE of Hōlualoa, Hawaii, United States09-18 11:19
  2. 2.870 km SE of Hōlualoa, Hawaii, United States09-19 03:28
  3. 2.869 km SE of Hōlualoa, Hawaii, United States09-28 11:35
  4. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 14:06
  5. 2.652 km SW of Hawaiian Paradise Park, United States09-26 19:41
  6. 2.671 km SE of Hōlualoa, Hawaii, United States09-19 15:24
  7. 2.667 km SE of Hōlualoa, Hawaii, United States09-21 18:58
  8. 2.671 km SE of Hōlualoa, Hawaii, United States09-23 13:27
  9. 2.471 km SE of Hōlualoa, Hawaii, United States09-28 11:57
  10. 2.457 km SW of Hawaiian Paradise Park, United States09-26 17:19
  11. 2.369 km SE of Hōlualoa, Hawaii, United States09-26 06:33
  12. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  13. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  14. 2.249 km SW of Hawaiian Paradise Park, United States09-25 09:46
  15. 2.276 km SW of Hawaiian Paradise Park, United States09-24 00:15
  16. 2.167 km SE of Hōlualoa, Hawaii, United States09-24 19:27
  17. 2.170 km SE of Hōlualoa, Hawaii, United States09-22 18:21
  18. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  19. 2.172 km SE of Hōlualoa, Hawaii, United States09-28 11:38
  20. 2.164 km SW of Hawaiian Paradise Park, United States09-28 02:21
  21. 2.167 km SW of Hawaiian Paradise Park, United States09-26 03:21
  22. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 10:20
  23. 2.171 km SE of Hōlualoa, Hawaii, United States09-24 02:41
  24. 2.166 km SE of Hōlualoa, Hawaii, United States09-26 19:41
  25. 2.067 km SE of Hōlualoa, Hawaii, United States09-23 10:38

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id hv75039307. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · HV (usgs:hv75039307). Cite as: SeismoAtlas, “M2.5 earthquake 70 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75039307-m2-5-earthquake-70-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75039307. SeismoAtlas is not an official warning service.