M5.1 earthquake 122 km S of Koseda, Kagoshima, Japan

Name: M5.1 earthquake 122 km S of Koseda, Kagoshima, Japan
Start: 2026-09-12T20:33:00.000Z
End: 2026-09-12T20:33:00.000Z
Location: 122 km S of Koseda, Kagoshima, Japan

A magnitude 5.1 earthquake struck 122 km S of Koseda, Kagoshima, Japan at 05:33 local time (20:33 UTC) on 13 Sept 2026, at a depth of 30 km, according to JMA and USGS. The solution is preliminary and may be revised.

Reported by 2 agencies · 1 reports to USGS “Did You Feel It?”

Data: JMA, USGS · updated 2026-09-24 16:46 UTC · automatic solution

Magnitude: 5.1moderate
JMA magnitude (Mj)
Depth: 30 km
Status: Automatic
Origin time: 2026-09-12 20:33:00 UTC; Local: 13 Sept 2026, 05:33:00 (Asia/Tokyo)
Epicentre: 29.300° N, 130.500° E

Circles show this event and others within 45 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
Place	Distance	Est. shaking
KosedaKagoshima, Japan · pop. 11,858	122 km	IIIWeak
AkarenKagoshima, Japan · pop. 6,629	122 km	IIIWeak
AmamiKagoshima, Japan · pop. 41,390	142 km	IIWeak
NazeKagoshima, Japan · pop. 41,365	143 km	IIWeak
KagoshimaJapan · pop. 595,049	252 km	IIWeak
MiyazakiJapan · pop. 401,339	304 km	INot felt
KotōKumamoto, Japan · pop. 543,730	388 km	INot felt
NagasakiJapan · pop. 409,118	388 km	INot 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 139 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.

Agency	Magnitude	Depth	Epicentre	Time offset	Status
JMAheadlineJMA via Japan Meteorological Agency	5.1 Mj	30 km	29.30° N, 130.50° E	–	Automatic
USGSUSGS NEIC via U.S. Geological Survey	5.1 mww	35.1 km	29.34° N, 130.38° E	−2.1 s	Reviewed

How big was it?

Felt by most people over a wide area. Can damage poorly built structures close to the epicentre.

It released roughly the energy of 674 t 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 30 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M5.1 with M4.1

M5.1 releases about 32× the energy of M4.1, and its waves are about 10× taller on a seismogram. Energy: 674 t of TNT vs 21 t of TNT.

Each square is the energy of one M4.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

No later earthquakes have been recorded within 45 km so far. Aftershock rates usually fall off roughly in proportion to 1/time.

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.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id jma20260913053312. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260913053312); USGS (usgs:us7000th1q). Cite as: SeismoAtlas, “M5.1 earthquake 122 km S of Koseda, Kagoshima, Japan”, https://seismoatlas.com/earthquake/jma20260913053312-m5-1-earthquake-122-km-s-of-koseda-kagoshima-japan, data from JMA, USGS.

JSON: /api/v1/events/jma20260913053312. SeismoAtlas is not an official warning service.