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SeismoAtlas

M2.6 earthquake 15 km NW of Sashiki, Kumamoto, Japan

A magnitude 2.6 earthquake struck 15 km NW of Sashiki, Kumamoto, Japan at 23:40 local time (14:40 UTC) on 8 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-08 14:43 UTC · automatic solution

Magnitude
2.6micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-08 14:40:00 UTC
Local: 8 Sept 2026, 23:40:00 (Asia/Tokyo)
Epicentre
32.400° 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
SashikiKumamoto, Japan · pop. 15,68115 kmIIWeak
MinamataKumamoto, Japan · pop. 29,42820 kmINot felt
AmakusaKumamoto, Japan · pop. 83,08221 kmINot felt
HonmachiKumamoto, Japan · pop. 123,06722 kmINot felt
Ōyanomachi-noboritateKumamoto, Japan · pop. 24,56322 kmINot felt
KumamotoJapan · pop. 738,90753 kmINot felt
KotōKumamoto, Japan · pop. 543,73053 kmINot felt
NagasakiJapan · pop. 409,11862 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 3 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 Agency2.6 Mj10 km32.40° N, 130.40° 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 120 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.

M2.6 releases about 32× the energy of M1.6, and its waves are about 10× taller on a seismogram. Energy: 120 kg of TNT vs 4 kg of TNT.

Each square is the energy of one M1.6. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

39 later earthquakes within 30 km; the largest was M4.0 14 days ago. 16 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
5.652.810
11.252.010
14.782.910
15.303.010
32.582.90
34.672.510
41.583.10
50.482.510
66.252.210
68.982.610
115.622.310
139.934.00
151.573.010
162.232.510
162.352.30
172.232.610
174.484.010
189.921.00
210.732.30
214.203.210
224.852.30
236.902.310
248.132.510
280.251.510
290.282.50
296.452.110
308.032.210
308.972.00
320.783.010
334.182.510
343.182.210
361.882.210
382.973.010
393.222.810
420.622.20
425.422.10
428.032.60
432.232.20
462.822.810
  1. 4.011 km S of Honmachi, Kumamoto, Japan09-14 10:36
  2. 4.0Near Minamata, Kumamoto, Japan09-15 21:09
  3. 3.24 km W of Wakasu, Kumamoto, Japan09-17 12:52
  4. 3.1Near Honmachi, Kumamoto, Japan09-10 08:15
  5. 3.09 km W of Honmachi, Kumamoto, Japan09-09 05:58
  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. 2.9Near Sashiki, Kumamoto, Japan09-09 05:27
  10. 2.9Near Honmachi, Kumamoto, Japan09-09 23:15
  11. 2.8Near Honmachi, Kumamoto, Japan09-08 20:19
  12. 2.8Near Minamata, Kumamoto, Japan09-24 23:53
  13. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  14. 2.611 km N of Sashiki, Kumamoto, Japan09-11 11:39
  15. 2.6Near Honmachi, Kumamoto, Japan09-15 18:54
  16. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  17. 2.5Near Honmachi, Kumamoto, Japan09-10 01:20
  18. 2.511 km N of Sashiki, Kumamoto, Japan09-10 17:09
  19. 2.5Near Minamata, Kumamoto, Japan09-15 08:54
  20. 2.5Near Sashiki, Kumamoto, Japan09-18 22:48
  21. 2.5Near Minamata, Kumamoto, Japan09-20 16:57
  22. 2.5Near Sashiki, Kumamoto, Japan09-22 12:51
  23. 2.3Near Sashiki, Kumamoto, Japan09-13 10:17
  24. 2.3Near Minamata, Kumamoto, Japan09-15 09:01
  25. 2.311 km N of Sashiki, Kumamoto, Japan09-17 09:24

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 jma20260908234052. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260908234052). Cite as: SeismoAtlas, “M2.6 earthquake 15 km NW of Sashiki, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260908234052-m2-6-earthquake-15-km-nw-of-sashiki-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260908234052. SeismoAtlas is not an official warning service.