M3.3 earthquake 69 km SE of Hōlualoa, Hawaii, United States

A magnitude 3.3 earthquake struck 69 km SE of Hōlualoa, Hawaii, United States at 05:52 local time (15:52 UTC) on 23 Oct 2026, at a depth of 29 km, according to USGS.

revised from M3.1 · 6 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-10-23 18:11 UTC · reviewed

Magnitude: 3.3minor
local magnitude (Richter) (ml)
revised from 3.1
Depth: 29.2 km
Status: Reviewed
Origin time: 2026-10-23 15:52:30 UTC; Local: 23 Oct 2026, 05:52:30 (Pacific/Honolulu)
Epicentre: 19.174° N, 155.491° 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
Place	Distance	Est. shaking
HōlualoaHawaii, United States · pop. 8,538	69 km	INot felt
Hawaiian Paradise ParkHawaii, United States · pop. 11,404	72 km	INot felt
HiloHawaii, United States · pop. 43,263	75 km	INot felt
HonoluluHawaii, United States · pop. 350,964	343 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	3.3 mlwas 3.1	29.2 km	19.17° N, 155.49° W	–	Reviewed · 1 revision

How big was it?

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

It released roughly the energy of 1.3 t 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 29 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M3.3 with M2.3

M3.3 releases about 31× the energy of M2.3, and its waves are about 9.8× taller on a seismogram. Energy: 1.3 t of TNT vs 43 kg of TNT.

Each square is the energy of one M2.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

169 later earthquakes within 30 km; the largest was M3.1 8 days ago. 56 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.3

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

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
1.56	2.0	32
1.86	1.6	31
1.96	1.1	30
3.90	1.4	28
5.91	1.9	-1
6.75	1.8	2
7.42	1.8	30
11.59	1.8	6
11.61	1.9	7
16.57	1.9	49
32.22	1.9	36
32.33	1.9	40
33.49	1.9	9
34.32	2.1	33
35.16	1.9	28
38.18	1.8	47
38.42	2.1	32
49.86	1.2	28
50.91	1.8	30
55.81	1.7	40
57.41	1.9	31
59.22	1.7	31
61.41	1.8	32
69.67	2.1	29
76.91	1.8	28
78.96	1.8	29
82.56	1.8	30
83.90	1.8	31
91.74	1.7	32
95.63	2.1	33
96.55	1.9	31
98.13	1.7	31
98.96	2.5	30
101.91	1.7	33
104.05	1.2	30
111.18	1.7	29
111.19	1.8	33
116.97	1.2	33
119.27	1.8	28
120.13	1.8	29
121.63	1.8	28
125.19	1.7	8
132.52	1.8	32
132.58	2.0	26
133.56	1.8	31
135.34	1.9	29
143.55	2.2	32
145.30	1.8	30
153.42	1.9	30
156.99	1.9	1
156.99	2.7	33
167.47	1.8	30
168.26	1.9	30
168.93	1.8	32
170.84	1.8	38
172.07	1.9	28
172.16	1.3	32
173.72	1.7	30
176.26	1.8	32
177.59	2.1	32
181.09	1.8	30
184.16	1.9	31
184.18	2.0	0
185.46	1.7	9
185.51	1.9	30
186.96	1.9	32
187.01	1.8	29
187.21	1.4	30
187.30	1.9	34
187.96	1.6	36
188.00	2.1	30
193.09	1.7	1
203.13	1.8	46
203.14	2.0	52
206.66	1.9	32
206.79	1.9	30
208.90	2.4	32
209.20	1.7	28
209.75	1.8	28
215.70	1.9	13
218.08	1.8	27
218.43	1.8	29
221.13	1.8	29
224.02	1.6	7
225.12	1.3	31
236.95	1.8	29
238.35	1.7	26
239.79	1.8	31
239.82	1.7	32
248.67	1.9	27
252.01	1.7	26
261.66	1.8	29
264.95	1.7	31
268.96	1.9	7
276.52	1.7	29
276.83	1.9	31
281.26	1.3	29
287.32	1.8	28
294.12	3.1	-2
294.54	1.8	-2
298.80	2.1	32
300.58	1.9	33
300.75	1.8	29
304.71	1.7	7
307.48	1.7	31
308.55	1.7	6
310.23	1.8	30
316.17	1.7	39
318.17	1.7	32
327.68	1.5	29
327.80	1.8	30
328.34	1.7	33
333.62	2.4	41
333.62	1.9	23
333.99	2.0	28
339.66	1.7	29
345.55	1.9	28
351.71	1.8	30
357.16	1.9	17
357.45	1.9	30
358.21	1.9	3
359.95	1.9	28
360.42	1.7	30
362.67	1.9	29
365.20	1.3	29
366.55	1.9	30
366.81	1.9	28
368.01	2.1	8
369.63	1.9	33
373.70	1.8	42
380.78	1.9	11
381.37	1.9	37
384.99	1.8	31
385.67	1.9	29
390.19	1.9	32
397.14	1.7	36
397.14	1.9	35
397.16	2.3	44
397.42	2.0	40
397.73	2.6	12
397.92	1.7	13
403.78	2.5	31
403.84	2.2	31
403.89	1.8	34
412.84	1.9	29
417.95	2.6	29
419.43	1.9	29
421.16	1.7	32
423.13	1.9	30
427.05	2.1	31
428.18	1.7	36
428.61	1.8	29
428.99	1.9	31
433.26	1.7	32
433.84	1.8	29
437.20	1.8	27
437.31	1.9	30
447.51	1.5	30
449.19	1.7	27
449.98	1.7	27
464.51	1.9	29
468.64	1.7	31
472.86	1.9	31
480.24	1.8	28
481.77	1.9	28
482.08	1.7	36
482.90	2.1	29
483.41	2.6	29
484.98	1.7	29

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 6 reports: add yours at USGS.

Event id hv75062811. First recorded here 23 Oct 2026, 15:56:19 UTC. Solutions: USGS · HV (usgs:hv75062811). Cite as: SeismoAtlas, “M3.3 earthquake 69 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75062811-m3-3-earthquake-69-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75062811. SeismoAtlas is not an official warning service.