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SeismoAtlas

M2.9 earthquake 4 km ESE of Uki, Kumamoto, Japan

A magnitude 2.9 earthquake struck 4 km ESE of Uki, Kumamoto, Japan at 15:17 local time (06:17 UTC) on 4 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-04 06:20 UTC · automatic solution

Magnitude
2.9micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-04 06:17:00 UTC
Local: 4 Sept 2026, 15:17:00 (Asia/Tokyo)
Epicentre
32.600° N, 130.700° E

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
UkiKumamoto, Japan · pop. 59,9284 kmIIIWeak
WakasuKumamoto, Japan · pop. 11,0946 kmIIIWeak
MatsubaseKumamoto, Japan · pop. 26,1636 kmIIIWeak
UtoKumamoto, Japan · pop. 37,4429 kmIIIWeak
HonmachiKumamoto, Japan · pop. 123,06715 kmIIWeak
KotōKumamoto, Japan · pop. 543,73021 kmIIWeak
KumamotoJapan · pop. 738,90723 kmIIWeak
NagasakiJapan · pop. 409,11879 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 10 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 JMA.

AgencyMagnitudeDepthEpicentreTime offsetStatus
JMAheadlineJMA via Japan Meteorological Agency2.9 Mj10 km32.60° N, 130.70° E–Automatic

How big was it?

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

It released roughly the energy of 338 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.

M2.9 releases about 32× the energy of M1.9, and its waves are about 10× taller on a seismogram. Energy: 338 kg of TNT vs 11 kg of TNT.

Each square is the energy of one M1.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

40 later earthquakes within 30 km; the largest was M4.5 2 days ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
5.382.910
24.203.110
26.152.40
49.032.50
80.073.810
94.623.510
101.753.310
110.032.810
119.683.010
136.972.90
139.052.510
145.973.10
153.582.310
154.872.510
162.832.810
173.372.610
244.324.00
255.953.010
276.622.610
294.301.00
315.122.30
318.583.210
319.382.910
322.782.520
341.282.310
346.702.810
351.682.510
358.782.710
410.002.310
418.373.50
425.173.010
450.173.310
487.353.010
487.482.710
505.782.00
523.234.510
523.432.910
524.073.610
532.422.60
567.202.810
  1. 4.55 km NNE of Shimada, Kumamoto, Japan09-26 01:31
  2. 4.011 km S of Honmachi, Kumamoto, Japan09-14 10:36
  3. 3.8Near Honmachi, Kumamoto, Japan09-07 14:21
  4. 3.65 km NNE of Shimada, Kumamoto, Japan09-26 02:21
  5. 3.59 km W of Honmachi, Kumamoto, Japan09-08 04:54
  6. 3.54 km ESE of Uki, Kumamoto, Japan09-21 16:39
  7. 3.3Near Honmachi, Kumamoto, Japan09-08 12:02
  8. 3.34 km NE of Uto, Kumamoto, Japan09-23 00:27
  9. 3.24 km W of Wakasu, Kumamoto, Japan09-17 12:52
  10. 3.1Near Honmachi, Kumamoto, Japan09-05 06:29
  11. 3.1Near Honmachi, Kumamoto, Japan09-10 08:15
  12. 3.09 km W of Honmachi, Kumamoto, Japan09-09 05:58
  13. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  14. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  15. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  16. 2.9Near Honmachi, Kumamoto, Japan09-04 11:40
  17. 2.9Near Honmachi, Kumamoto, Japan09-09 23:15
  18. 2.94 km NE of Uto, Kumamoto, Japan09-17 13:40
  19. 2.95 km NNE of Shimada, Kumamoto, Japan09-26 01:43
  20. 2.8Near Honmachi, Kumamoto, Japan09-08 20:19
  21. 2.8Near Mifune, Kumamoto, Japan09-11 01:07
  22. 2.84 km ESE of Uki, Kumamoto, Japan09-18 16:59
  23. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  24. 2.74 km NE of Uto, Kumamoto, Japan09-19 05:04
  25. 2.74 km NE of Uto, Kumamoto, Japan09-24 13:46

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.

Event id jma20260904151714. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260904151714). Cite as: SeismoAtlas, “M2.9 earthquake 4 km ESE of Uki, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260904151714-m2-9-earthquake-4-km-ese-of-uki-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260904151714. SeismoAtlas is not an official warning service.