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SeismoAtlas

M2.8 earthquake near Mifune, Kumamoto, Japan

A magnitude 2.8 earthquake struck near Mifune, Kumamoto, Japan at 10:07 local time (01:07 UTC) on 11 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-11 01:10 UTC · automatic solution

Magnitude
2.8micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-11 01:07:00 UTC
Local: 11 Sept 2026, 10:07:00 (Asia/Tokyo)
Epicentre
32.700° N, 130.800° 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
MifuneKumamoto, Japan · pop. 16,9013 kmIIIWeak
IwashitaKumamoto, Japan · pop. 10,1326 kmIIIWeak
ShimadaKumamoto, Japan · pop. 32,5107 kmIIIWeak
KotōKumamoto, Japan · pop. 543,73010 kmIIWeak
UtoKumamoto, Japan · pop. 37,44212 kmIIWeak
MatsubaseKumamoto, Japan · pop. 26,16313 kmIIWeak
KumamotoJapan · pop. 738,90716 kmIIWeak
KurumeFukuoka, Japan · pop. 303,57974 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 8 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 Mj10 km32.70° N, 130.80° 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 10 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

21 later earthquakes within 30 km; the largest was M4.5 2 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
93.123.010
113.782.610
131.471.00
155.753.210
156.552.910
159.952.520
178.452.310
183.872.810
188.852.510
195.952.710
247.172.310
255.533.50
262.333.010
287.333.310
324.523.010
324.652.710
342.952.00
360.404.510
360.602.910
361.233.610
369.582.60
  1. 4.55 km NNE of Shimada, Kumamoto, Japan09-26 01:31
  2. 3.65 km NNE of Shimada, Kumamoto, Japan09-26 02:21
  3. 3.54 km ESE of Uki, Kumamoto, Japan09-21 16:39
  4. 3.34 km NE of Uto, Kumamoto, Japan09-23 00:27
  5. 3.24 km W of Wakasu, Kumamoto, Japan09-17 12:52
  6. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  7. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  8. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  9. 2.94 km NE of Uto, Kumamoto, Japan09-17 13:40
  10. 2.95 km NNE of Shimada, Kumamoto, Japan09-26 01:43
  11. 2.84 km ESE of Uki, Kumamoto, Japan09-18 16:59
  12. 2.74 km NE of Uto, Kumamoto, Japan09-19 05:04
  13. 2.74 km NE of Uto, Kumamoto, Japan09-24 13:46
  14. 2.6Near Honmachi, Kumamoto, Japan09-15 18:54
  15. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  16. 2.54 km NE of Uto, Kumamoto, Japan09-17 17:04
  17. 2.54 km NE of Uto, Kumamoto, Japan09-18 21:58
  18. 2.3Near Honmachi, Kumamoto, Japan09-18 11:34
  19. 2.3Near Mifune, Kumamoto, Japan09-21 08:17
  20. 2.04 km ESE of Uki, Kumamoto, Japan09-25 08:04
  21. 1.0Near Honmachi, Kumamoto, Japan09-16 12:35

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 jma20260911100727. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260911100727). Cite as: SeismoAtlas, “M2.8 earthquake near Mifune, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260911100727-m2-8-earthquake-near-mifune-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260911100727. SeismoAtlas is not an official warning service.