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SeismoAtlas

M2.3 earthquake near Sashiki, Kumamoto, Japan

A magnitude 2.3 earthquake struck near Sashiki, Kumamoto, Japan at 19:17 local time (10:17 UTC) on 13 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-13 10:19 UTC · automatic solution

Magnitude
2.3micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-13 10:17:00 UTC
Local: 13 Sept 2026, 19:17:00 (Asia/Tokyo)
Epicentre
32.300° N, 130.500° 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
SashikiKumamoto, Japan · pop. 15,6810 kmIIWeak
MinamataKumamoto, Japan · pop. 29,42813 kmINot felt
HonmachiKumamoto, Japan · pop. 123,06724 kmINot felt
HitoyoshiKumamoto, Japan · pop. 38,00625 kmINot felt
IzumiKagoshima, Japan · pop. 51,99427 kmINot felt
KotōKumamoto, Japan · pop. 543,73058 kmINot felt
KumamotoJapan · pop. 738,90759 kmINot felt
NagasakiJapan · pop. 409,11877 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.

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 Agency2.3 Mj10 km32.30° N, 130.50° E–Automatic

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How big was it?

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

It released roughly the energy of 43 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.

M2.3 releases about 32× the energy of M1.3, and its waves are about 10× taller on a seismogram. Energy: 43 kg of TNT vs 1 kg of TNT.

Each square is the energy of one M1.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

27 later earthquakes within 30 km; the largest was M4.0 14 days ago. 15 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
24.324.00
35.953.010
46.622.510
46.732.30
56.622.610
58.874.010
74.301.00
95.122.30
109.232.30
121.282.310
132.522.510
164.631.510
174.672.50
180.832.110
192.422.210
193.352.00
205.173.010
218.572.510
227.572.210
246.272.210
267.353.010
277.602.810
305.002.20
309.802.10
312.422.60
316.622.20
347.202.810
  1. 4.011 km S of Honmachi, Kumamoto, Japan09-14 10:36
  2. 4.0Near Minamata, Kumamoto, Japan09-15 21:09
  3. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  4. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  5. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  6. 2.8Near Minamata, Kumamoto, Japan09-24 23:53
  7. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  8. 2.6Near Honmachi, Kumamoto, Japan09-15 18:54
  9. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  10. 2.5Near Minamata, Kumamoto, Japan09-15 08:54
  11. 2.5Near Sashiki, Kumamoto, Japan09-18 22:48
  12. 2.5Near Minamata, Kumamoto, Japan09-20 16:57
  13. 2.5Near Sashiki, Kumamoto, Japan09-22 12:51
  14. 2.3Near Minamata, Kumamoto, Japan09-15 09:01
  15. 2.311 km N of Sashiki, Kumamoto, Japan09-17 09:24
  16. 2.3Near Minamata, Kumamoto, Japan09-17 23:31
  17. 2.3Near Honmachi, Kumamoto, Japan09-18 11:34
  18. 2.2Near Minamata, Kumamoto, Japan09-21 10:42
  19. 2.2Near Minamata, Kumamoto, Japan09-22 21:51
  20. 2.2Near Minamata, Kumamoto, Japan09-23 16:33
  21. 2.2Near Minamata, Kumamoto, Japan09-26 03:17
  22. 2.2Near Sashiki, Kumamoto, Japan09-26 14:54
  23. 2.1Near Minamata, Kumamoto, Japan09-20 23:07
  24. 2.19 km N of Minamata, Kumamoto, Japan09-26 08:05
  25. 2.09 km N of Minamata, Kumamoto, Japan09-21 11:38

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

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Reports on SeismoAtlas

No reports yet.

Event id jma20260913191713. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260913191713). Cite as: SeismoAtlas, “M2.3 earthquake near Sashiki, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260913191713-m2-3-earthquake-near-sashiki-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260913191713. SeismoAtlas is not an official warning service.