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M3.2 earthquake 4 km W of Wakasu, Kumamoto, Japan

A magnitude 3.2 earthquake struck 4 km W of Wakasu, Kumamoto, Japan at 21:52 local time (12:52 UTC) on 17 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-17 12:55 UTC · automatic solution

Magnitude
3.2minor
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-17 12:52:00 UTC
Local: 17 Sept 2026, 21:52:00 (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 kmIIIWeak
MatsubaseKumamoto, Japan · pop. 26,1639 kmIIIWeak
UtoKumamoto, Japan · pop. 37,44211 kmIIIWeak
HonmachiKumamoto, Japan · pop. 123,06711 kmIIIWeak
KotōKumamoto, Japan · pop. 543,73024 kmIIWeak
KumamotoJapan · pop. 738,90725 kmIIWeak
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 17 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 Agency3.2 Mj10 km32.60° N, 130.60° E–Automatic

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 951 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.

M3.2 releases about 32× the energy of M2.2, and its waves are about 10× taller on a seismogram. Energy: 951 kg of TNT vs 30 kg of TNT.

Each square is the energy of one M2.2. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

18 later earthquakes within 30 km; the largest was M4.5 2 days ago. 9 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.2

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.802.910
4.202.520
22.702.310
28.122.810
33.102.510
40.202.710
91.422.310
99.783.50
106.583.010
131.583.310
168.773.010
168.902.710
187.202.00
204.654.510
204.852.910
205.483.610
213.832.60
248.622.810
  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. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  6. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  7. 2.94 km NE of Uto, Kumamoto, Japan09-17 13:40
  8. 2.95 km NNE of Shimada, Kumamoto, Japan09-26 01:43
  9. 2.84 km ESE of Uki, Kumamoto, Japan09-18 16:59
  10. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  11. 2.74 km NE of Uto, Kumamoto, Japan09-19 05:04
  12. 2.74 km NE of Uto, Kumamoto, Japan09-24 13:46
  13. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  14. 2.54 km NE of Uto, Kumamoto, Japan09-17 17:04
  15. 2.54 km NE of Uto, Kumamoto, Japan09-18 21:58
  16. 2.3Near Honmachi, Kumamoto, Japan09-18 11:34
  17. 2.3Near Mifune, Kumamoto, Japan09-21 08:17
  18. 2.04 km ESE of Uki, Kumamoto, Japan09-25 08:04

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id jma20260917215229. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260917215229). Cite as: SeismoAtlas, “M3.2 earthquake 4 km W of Wakasu, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260917215229-m3-2-earthquake-4-km-w-of-wakasu-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260917215229. SeismoAtlas is not an official warning service.