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SeismoAtlas

M3.1 earthquake 16 km ENE of Kalaoa, Hawaii, United States

A magnitude 3.1 earthquake struck 16 km ENE of Kalaoa, Hawaii, United States at 20:52 local time (06:52 UTC) on 7 Sept 2026, at a depth of 10 km, according to USGS.

1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-09 06:40 UTC · reviewed

Magnitude
3.1minor
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-08 06:52:45 UTC
Local: 7 Sept 2026, 20:52:45 (Pacific/Honolulu)
Epicentre
19.761° N, 155.834° 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
KalaoaHawaii, United States · pop. 9,64416 kmIIWeak
HōlualoaHawaii, United States · pop. 8,53820 kmIIWeak
HiloHawaii, United States · pop. 43,26378 kmINot felt
KīheiHawaii, United States · pop. 20,881128 kmINot felt
KahuluiHawaii, United States · pop. 26,337142 kmINot felt
HonoluluHawaii, United States · pop. 350,964272 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 15 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 Survey3.1 ml10 km19.76° N, 155.83° W–Reviewed

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How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 747 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.

M3.1 releases about 35× the energy of M2.1, and its waves are about 11× taller on a seismogram. Energy: 747 kg of TNT vs 21 kg of TNT.

Each square is the energy of one M2.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

4 later earthquakes within 30 km; the largest was M2.8 10 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
250.182.59
250.202.811
345.431.813
407.331.726
  1. 2.89 km S of Waimea, Hawaii, United States09-18 17:05
  2. 2.511 km SSW of Waimea, Hawaii, United States09-18 17:03
  3. 1.821 km SSE of Waimea, Hawaii, United States09-22 16:18
  4. 1.721 km SSE of Waimea, Hawaii, United States09-25 06:12

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.

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

Event id hv75030777. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · HV (usgs:hv75030777). Cite as: SeismoAtlas, “M3.1 earthquake 16 km ENE of Kalaoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75030777-m3-1-earthquake-16-km-ene-of-kalaoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75030777. SeismoAtlas is not an official warning service.