Skip to content
SeismoAtlas

M2.8 earthquake 9 km N of Minamata, Kumamoto, Japan

A magnitude 2.8 earthquake struck 9 km N of Minamata, Kumamoto, Japan at 11:54 local time (02:54 UTC) on 2 Sept 2026, at a depth of 0 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-02 02:57 UTC · automatic solution

Magnitude
2.8micro
JMA magnitude (Mj)
Depth
0 km
Status
Automatic
Origin time
2026-09-02 02:54:00 UTC
Local: 2 Sept 2026, 11:54:00 (Asia/Tokyo)
Epicentre
32.300° N, 130.400° 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
MinamataKumamoto, Japan · pop. 29,4289 kmIIIWeak
SashikiKumamoto, Japan · pop. 15,6819 kmIIIWeak
IzumiKagoshima, Japan · pop. 51,99425 kmIIWeak
AmakusaKumamoto, Japan · pop. 83,08227 kmINot felt
Hondomachi-hondoKumamoto, Japan · pop. 40,78728 kmINot felt
KotōKumamoto, Japan · pop. 543,73063 kmINot felt
KumamotoJapan · pop. 738,90763 kmINot felt
NagasakiJapan · pop. 409,11870 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 13 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 Agency2.8 Mj0 km32.30° N, 130.40° E–Automatic

How big was it?

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

It released roughly the energy of 239 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 0 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.8 releases about 32× the energy of M1.8, and its waves are about 10× taller on a seismogram. Energy: 239 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

53 later earthquakes within 30 km; the largest was M4.0 14 days ago. 4 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
18.003.210
18.751.810
20.472.310
24.022.30
48.002.910
56.772.910
75.583.110
77.532.40
100.422.50
100.901.70
131.453.810
141.632.30
146.003.510
153.133.310
155.772.610
161.422.810
167.022.010
170.552.910
171.073.010
188.352.90
190.432.510
197.353.10
206.252.510
222.022.210
224.752.610
271.382.310
295.704.00
307.333.010
318.002.510
318.122.30
328.002.610
330.254.010
345.681.00
366.502.30
380.622.30
392.672.310
403.902.510
436.021.510
446.052.50
452.222.110
463.802.210
464.732.00
476.553.010
489.952.510
498.952.210
517.652.210
538.733.010
548.982.810
576.382.20
581.182.10
583.802.60
588.002.20
618.582.810
  1. 4.011 km S of Honmachi, Kumamoto, Japan09-14 10:36
  2. 4.0Near Minamata, Kumamoto, Japan09-15 21:09
  3. 3.8Near Honmachi, Kumamoto, Japan09-07 14:21
  4. 3.59 km W of Honmachi, Kumamoto, Japan09-08 04:54
  5. 3.3Near Honmachi, Kumamoto, Japan09-08 12:02
  6. 3.211 km N of Sashiki, Kumamoto, Japan09-02 20:54
  7. 3.1Near Honmachi, Kumamoto, Japan09-05 06:29
  8. 3.1Near Honmachi, Kumamoto, Japan09-10 08:15
  9. 3.09 km W of Honmachi, Kumamoto, Japan09-09 05:58
  10. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  11. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  12. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  13. 2.9Near Honmachi, Kumamoto, Japan09-04 02:54
  14. 2.9Near Honmachi, Kumamoto, Japan09-04 11:40
  15. 2.9Near Sashiki, Kumamoto, Japan09-09 05:27
  16. 2.9Near Honmachi, Kumamoto, Japan09-09 23:15
  17. 2.8Near Honmachi, Kumamoto, Japan09-08 20:19
  18. 2.8Near Minamata, Kumamoto, Japan09-24 23:53
  19. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  20. 2.615 km NW of Sashiki, Kumamoto, Japan09-08 14:40
  21. 2.611 km N of Sashiki, Kumamoto, Japan09-11 11:39
  22. 2.6Near Honmachi, Kumamoto, Japan09-15 18:54
  23. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  24. 2.5Near Honmachi, Kumamoto, Japan09-06 07:19
  25. 2.5Near Honmachi, Kumamoto, Japan09-10 01:20

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 jma20260902115431. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260902115431). Cite as: SeismoAtlas, “M2.8 earthquake 9 km N of Minamata, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260902115431-m2-8-earthquake-9-km-n-of-minamata-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260902115431. SeismoAtlas is not an official warning service.