M4.1 earthquake 37 km S of Shizunai-furukawachō, Hokkaido, Japan

Name: M4.1 earthquake 37 km S of Shizunai-furukawachō, Hokkaido, Japan
Start: 2026-09-01T17:50:00.000Z
End: 2026-09-01T17:50:00.000Z
Location: 37 km S of Shizunai-furukawachō, Hokkaido, Japan

A magnitude 4.1 earthquake struck 37 km S of Shizunai-furukawachō, Hokkaido, Japan at 02:50 local time (17:50 UTC) on 2 Sept 2026, at a depth of 60 km, according to JMA and USGS. The solution is preliminary and may be revised.

Reported by 2 agencies

Data: JMA, USGS · updated 2026-09-09 14:58 UTC · automatic solution

Magnitude: 4.1light
JMA magnitude (Mj)
Depth: 60 km
Status: Automatic
Origin time: 2026-09-01 17:50:00 UTC; Local: 2 Sept 2026, 02:50:00 (Asia/Tokyo)
Epicentre: 42.000° N, 142.300° 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
Place	Distance	Est. shaking
Shizunai-furukawachōHokkaido, Japan · pop. 22,436	37 km	IIWeak
NiikappuHokkaido, Japan · pop. 5,696	39 km	IIWeak
TomakomaiHokkaido, Japan · pop. 174,806	92 km	INot felt
NoboribetsuHokkaido, Japan · pop. 46,391	105 km	INot felt
ChitoseHokkaido, Japan · pop. 97,950	106 km	INot felt
HakodateHokkaido, Japan · pop. 275,730	131 km	INot felt
SapporoHokkaido, Japan · pop. 1,973,832	142 km	INot felt
AomoriJapan · pop. 298,394	185 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.

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	4.1 Mj	60 km	42.00° N, 142.30° E	–	Automatic
USGSUSGS NEIC via U.S. Geological Survey	4.3 mb	65.9 km	42.03° N, 142.33° E	+1.5 s	Reviewed

How big was it?

Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.

It released roughly the energy of 21 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 60 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M4.1 with M3.1

M4.1 releases about 32× the energy of M3.1, and its waves are about 10× taller on a seismogram. Energy: 21 t of TNT vs 674 kg of TNT.

Each square is the energy of one M3.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

1 later earthquake within 30 km; the largest was M3.5 1 day ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M4.1

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

3.516 km WSW of Urakawa, Hokkaido, Japan09-27 07:25

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 jma20260902025012. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: JMA (jma:20260902025012); USGS (usgs:us7000tdem). Cite as: SeismoAtlas, “M4.1 earthquake 37 km S of Shizunai-furukawachō, Hokkaido, Japan”, https://seismoatlas.com/earthquake/jma20260902025012-m4-1-earthquake-37-km-s-of-shizunai-furukawacho-hokkaido-japan, data from JMA, USGS.

JSON: /api/v1/events/jma20260902025012. SeismoAtlas is not an official warning service.