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M4.0 earthquake 11 km S of Honmachi, Kumamoto, Japan

A magnitude 4.0 earthquake struck 11 km S of Honmachi, Kumamoto, Japan at 19:36 local time (10:36 UTC) on 14 Sept 2026, at a depth of 0 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-14 10:40 UTC · automatic solution

Magnitude
4.0light
JMA magnitude (Mj)
Depth
0 km
Status
Automatic
Origin time
2026-09-14 10:36:00 UTC
Local: 14 Sept 2026, 19:36:00 (Asia/Tokyo)
Epicentre
32.400° N, 130.600° 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
HonmachiKumamoto, Japan · pop. 123,06711 kmIVLight
SashikiKumamoto, Japan · pop. 15,68115 kmIVLight
HitoyoshiKumamoto, Japan · pop. 38,00624 kmIIIWeak
UkiKumamoto, Japan · pop. 59,92825 kmIIIWeak
Ōyanomachi-noboritateKumamoto, Japan · pop. 24,56327 kmIIIWeak
KotōKumamoto, Japan · pop. 543,73045 kmIIWeak
KumamotoJapan · pop. 738,90746 kmIIWeak
NagasakiJapan · pop. 409,11878 kmIIWeak

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 44 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 Agency4.0 Mj0 km32.40° N, 130.60° E–Automatic

How big was it?

Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.

It released roughly the energy of 15 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 0 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M4.0 releases about 32× the energy of M3.0, and its waves are about 10× taller on a seismogram. Energy: 15 t of TNT vs 477 kg of TNT.

Each square is the energy of one M3.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

30 later earthquakes within 30 km; the largest was M4.0 13 days ago. 15 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M4.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
11.633.010
22.302.510
22.422.30
32.302.610
34.554.010
49.981.00
70.802.30
74.273.210
84.922.30
96.972.310
102.382.810
108.202.510
140.321.510
150.352.50
156.522.110
168.102.210
169.032.00
174.053.50
180.853.010
194.252.510
203.252.210
221.952.210
243.033.010
253.282.810
261.472.00
280.682.20
285.482.10
288.102.60
292.302.20
322.882.810
  1. 4.0Near Minamata, Kumamoto, Japan09-15 21:09
  2. 3.54 km ESE of Uki, Kumamoto, Japan09-21 16:39
  3. 3.24 km W of Wakasu, Kumamoto, Japan09-17 12:52
  4. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  5. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  6. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  7. 2.84 km ESE of Uki, Kumamoto, Japan09-18 16:59
  8. 2.8Near Minamata, Kumamoto, Japan09-24 23:53
  9. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  10. 2.6Near Honmachi, Kumamoto, Japan09-15 18:54
  11. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  12. 2.5Near Minamata, Kumamoto, Japan09-15 08:54
  13. 2.5Near Sashiki, Kumamoto, Japan09-18 22:48
  14. 2.5Near Minamata, Kumamoto, Japan09-20 16:57
  15. 2.5Near Sashiki, Kumamoto, Japan09-22 12:51
  16. 2.3Near Minamata, Kumamoto, Japan09-15 09:01
  17. 2.311 km N of Sashiki, Kumamoto, Japan09-17 09:24
  18. 2.3Near Minamata, Kumamoto, Japan09-17 23:31
  19. 2.3Near Honmachi, Kumamoto, Japan09-18 11:34
  20. 2.2Near Minamata, Kumamoto, Japan09-21 10:42
  21. 2.2Near Minamata, Kumamoto, Japan09-22 21:51
  22. 2.2Near Minamata, Kumamoto, Japan09-23 16:33
  23. 2.2Near Minamata, Kumamoto, Japan09-26 03:17
  24. 2.2Near Sashiki, Kumamoto, Japan09-26 14:54
  25. 2.1Near Minamata, Kumamoto, Japan09-20 23:07

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 jma20260914193640. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260914193640). Cite as: SeismoAtlas, “M4.0 earthquake 11 km S of Honmachi, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260914193640-m4-0-earthquake-11-km-s-of-honmachi-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260914193640. SeismoAtlas is not an official warning service.