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SeismoAtlas

M2.7 earthquake 4 km W of Wakasu, Kumamoto, Japan

A magnitude 2.7 earthquake struck 4 km W of Wakasu, Kumamoto, Japan at 18:44 local time (09:44 UTC) on 1 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-01 09:47 UTC · automatic solution

Magnitude
2.7micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-01 09:44:00 UTC
Local: 1 Sept 2026, 18:44:00 (Asia/Tokyo)
Epicentre
32.600° 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
WakasuKumamoto, Japan · pop. 11,0944 kmIIIWeak
UkiKumamoto, Japan · pop. 59,9286 kmIIWeak
MatsubaseKumamoto, Japan · pop. 26,1639 kmIIWeak
UtoKumamoto, Japan · pop. 37,44211 kmIIWeak
HonmachiKumamoto, Japan · pop. 123,06711 kmIIWeak
KotōKumamoto, Japan · pop. 543,73024 kmINot felt
KumamotoJapan · pop. 738,90725 kmINot felt
NagasakiJapan · pop. 409,11869 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 6 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 Agency2.7 Mj10 km32.60° N, 130.60° E–Automatic

How big was it?

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

It released roughly the energy of 169 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.

M2.7 releases about 32× the energy of M1.7, and its waves are about 10× taller on a seismogram. Energy: 169 kg of TNT vs 5 kg of TNT.

Each square is the energy of one M1.7. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

48 later earthquakes within 30 km; the largest was M4.5 2 days ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
4.652.70
6.232.310
35.173.210
38.002.510
46.152.110
65.172.910
68.552.910
73.932.910
92.753.110
94.702.40
117.582.50
148.623.810
163.173.510
170.303.310
172.932.610
178.582.810
188.233.010
205.522.90
207.602.510
214.523.10
222.132.310
223.422.510
231.382.810
241.922.610
312.874.00
324.503.010
345.172.610
362.851.00
383.672.30
387.133.210
387.932.910
391.332.520
409.832.310
415.252.810
420.232.510
427.332.710
478.552.310
486.923.50
493.723.010
518.723.310
555.903.010
556.032.710
574.332.00
591.784.510
591.982.910
592.623.610
600.972.60
635.752.810
  1. 4.55 km NNE of Shimada, Kumamoto, Japan09-26 01:31
  2. 4.011 km S of Honmachi, Kumamoto, Japan09-14 10:36
  3. 3.8Near Honmachi, Kumamoto, Japan09-07 14:21
  4. 3.65 km NNE of Shimada, Kumamoto, Japan09-26 02:21
  5. 3.59 km W of Honmachi, Kumamoto, Japan09-08 04:54
  6. 3.54 km ESE of Uki, Kumamoto, Japan09-21 16:39
  7. 3.3Near Honmachi, Kumamoto, Japan09-08 12:02
  8. 3.34 km NE of Uto, Kumamoto, Japan09-23 00:27
  9. 3.211 km N of Sashiki, Kumamoto, Japan09-02 20:54
  10. 3.24 km W of Wakasu, Kumamoto, Japan09-17 12:52
  11. 3.1Near Honmachi, Kumamoto, Japan09-05 06:29
  12. 3.1Near Honmachi, Kumamoto, Japan09-10 08:15
  13. 3.09 km W of Honmachi, Kumamoto, Japan09-09 05:58
  14. 3.0Near Honmachi, Kumamoto, Japan09-14 22:14
  15. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  16. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  17. 2.9Near Honmachi, Kumamoto, Japan09-04 02:54
  18. 2.94 km ESE of Uki, Kumamoto, Japan09-04 06:17
  19. 2.9Near Honmachi, Kumamoto, Japan09-04 11:40
  20. 2.9Near Honmachi, Kumamoto, Japan09-09 23:15
  21. 2.94 km NE of Uto, Kumamoto, Japan09-17 13:40
  22. 2.95 km NNE of Shimada, Kumamoto, Japan09-26 01:43
  23. 2.8Near Honmachi, Kumamoto, Japan09-08 20:19
  24. 2.8Near Mifune, Kumamoto, Japan09-11 01:07
  25. 2.84 km ESE of Uki, Kumamoto, Japan09-18 16:59

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 jma20260901184431. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260901184431). Cite as: SeismoAtlas, “M2.7 earthquake 4 km W of Wakasu, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260901184431-m2-7-earthquake-4-km-w-of-wakasu-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260901184431. SeismoAtlas is not an official warning service.