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M2.5 earthquake near Sashiki, Kumamoto, Japan

A magnitude 2.5 earthquake struck near Sashiki, Kumamoto, Japan at 21:51 local time (12:51 UTC) on 22 Sept 2026, at a depth of 10 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-22 12:53 UTC · automatic solution

Magnitude
2.5micro
JMA magnitude (Mj)
Depth
10 km
Status
Automatic
Origin time
2026-09-22 12:51:00 UTC
Local: 22 Sept 2026, 21:51:00 (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 kmIIWeak
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 Agency2.5 Mj10 km32.30° N, 130.50° E–Automatic

How big was it?

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

It released roughly the energy of 85 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.

M2.5 releases about 32× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 85 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

9 later earthquakes within 30 km; the largest was M3.0 4 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
9.002.210
27.702.210
48.783.010
59.032.810
86.432.20
91.232.10
93.852.60
98.052.20
128.632.810
  1. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  2. 2.8Near Minamata, Kumamoto, Japan09-24 23:53
  3. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  4. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  5. 2.2Near Minamata, Kumamoto, Japan09-22 21:51
  6. 2.2Near Minamata, Kumamoto, Japan09-23 16:33
  7. 2.2Near Minamata, Kumamoto, Japan09-26 03:17
  8. 2.2Near Sashiki, Kumamoto, Japan09-26 14:54
  9. 2.19 km N of Minamata, Kumamoto, Japan09-26 08:05

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id jma20260922215120. First recorded here 28 Sept 2026, 17:32:05 UTC. Solutions: JMA (jma:20260922215120). Cite as: SeismoAtlas, “M2.5 earthquake near Sashiki, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260922215120-m2-5-earthquake-near-sashiki-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260922215120. SeismoAtlas is not an official warning service.