M2.1 earthquake 35 km SSE of Hōlualoa, Hawaii, United States
A magnitude 2.1 earthquake struck 35 km SSE of Hōlualoa, Hawaii, United States at 18:43 local time (04:43 UTC) on 17 Oct 2026, at a depth of 17 km, according to USGS.
revised from M2.4
Data: USGS · updated 2026-10-24 03:22 UTC · reviewed
- Magnitude
- 2.1micro
local magnitude (Richter) (ml)
revised from 2.4 - Depth
- 17 km
- Status
- Reviewed
- Origin time
- 2026-10-18 04:43:04 UTC
- Local: 17 Oct 2026, 18:43:04 (Pacific/Honolulu)
- Epicentre
- 19.313° N, 155.876° 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
| Place | Distance | Est. shaking |
|---|---|---|
| HōlualoaHawaii, United States · pop. 8,538 | 35 km | INot felt |
| Kailua-KonaHawaii, United States · pop. 11,975 | 39 km | INot felt |
| HiloHawaii, United States · pop. 43,263 | 95 km | INot felt |
| HonoluluHawaii, United States · pop. 350,964 | 304 km | INot 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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · HVheadlineHawaiian Volcano Observatory via U.S. Geological Survey | 2.1 mlwas 2.4 | 17 km | 19.31° N, 155.88° 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 24 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 17 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M2.1 releases about 36× the energy of M1.1, and its waves are about 11× taller on a seismogram. Energy: 24 kg of TNT vs 674 g of TNT.
Each square is the energy of one M1.1. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
11 later earthquakes within 30 km; the largest was M3.1 8 days ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M2.1
11 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 15.61 | 3.0 | -1 |
| 68.05 | 2.3 | 45 |
| 72.66 | 1.7 | 13 |
| 374.02 | 2.1 | 22 |
| 395.06 | 2.0 | 44 |
| 425.28 | 3.1 | -2 |
| 425.70 | 1.8 | -2 |
| 462.10 | 2.4 | 73 |
| 477.62 | 2.1 | 17 |
| 514.84 | 2.4 | 15 |
| 579.83 | 1.7 | 0 |
- 3.143 km SE of Hōlualoa, Hawaii, United States11-04 21:59
- 3.056 km SSE of Hōlualoa, Hawaii, United States10-18 20:19
- 2.435 km SSE of Hōlualoa, Hawaii, United States11-08 15:33
- 2.429 km SSE of Hōlualoa, Hawaii, United States11-06 10:48
- 2.339 km ESE of Hōlualoa, Hawaii, United States10-21 00:46
- 2.117 km SE of Hōlualoa, Hawaii, United States11-02 18:44
- 2.128 km SSE of Hōlualoa, Hawaii, United States11-07 02:20
- 2.028 km SSW of Kailua-Kona, Hawaii, United States11-03 15:46
- 1.842 km SE of Hōlualoa, Hawaii, United States11-04 22:25
- 1.724 km SSE of Hōlualoa, Hawaii, United States10-21 05:22
- 1.742 km SSE of Hōlualoa, Hawaii, United States11-11 08:33
Did you feel it?
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Reports on SeismoAtlas
No reports yet.
Event id hv75060091. First recorded here 18 Oct 2026, 04:46:22 UTC. Solutions: USGS · HV (usgs:hv75060091). Cite as: SeismoAtlas, “M2.1 earthquake 35 km SSE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75060091-m2-1-earthquake-35-km-sse-of-holualoa-hawaii-united-states, data from USGS.
JSON: /api/v1/events/hv75060091. SeismoAtlas is not an official warning service.