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M4.4 earthquake 86 km NE of Choshi, Chiba, Japan

A magnitude 4.4 earthquake struck 86 km NE of Choshi, Chiba, Japan at 07:25 local time (22:25 UTC) on 9 Nov 2026, at a depth of 10 km, according to USGS and GFZ.

Reported by 2 agencies

Data: USGS, GFZ · updated 2026-11-09 01:50 UTC · reviewed

Magnitude
4.4light
body-wave magnitude (mb)
Depth
10 km
Status
Reviewed
Origin time
2026-11-08 22:25:40 UTC
Local: 9 Nov 2026, 07:25:40 (Asia/Tokyo)
Epicentre
36.202° N, 141.583° 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
ChoshiChiba, Japan · pop. 58,43186 kmIIWeak
HasakiChiba, Japan · pop. 39,20986 kmIIWeak
Kashima-shiIbaraki, Japan · pop. 66,95089 kmIIWeak
KamisuIbaraki, Japan · pop. 95,45489 kmIIWeak
MitoIbaraki, Japan · pop. 270,685103 kmIIWeak
IwakiFukushima, Japan · pop. 357,309113 kmIIWeak
ChibaJapan · pop. 979,768148 kmINot felt
KashiwaChiba, Japan · pop. 433,436149 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 66 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 USGS, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey4.4 mb10 km36.20° N, 141.58° E–Reviewed
GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences4.6 M10 km36.18° N, 141.72° E+0.3 sAutomatic

How big was it?

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

It released roughly the energy of 60 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 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M4.4 releases about 32× the energy of M3.4, and its waves are about 10× taller on a seismogram. Energy: 60 t of TNT vs 1.9 t of TNT.

Each square is the energy of one M3.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

4 later earthquakes within 30 km; the largest was M5.7 3 days ago. 2 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M4.4

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.455.724
6.594.540
30.914.530
53.524.620
  1. 5.7107 km ENE of Choshi, Chiba, Japan11-09 04:52
  2. 4.699 km ESE of Takahagi, Ibaraki, Japan11-11 03:57
  3. 4.599 km ESE of Takahagi, Ibaraki, Japan11-09 05:01
  4. 4.591 km ESE of Hitachi, Ibaraki, Japan11-10 05:20

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id us7000twzl. First recorded here 9 Nov 2026, 01:52:27 UTC. Solutions: USGS (usgs:us7000twzl); GFZ (geofon:gfz2026vxxv). Cite as: SeismoAtlas, “M4.4 earthquake 86 km NE of Choshi, Chiba, Japan”, https://seismoatlas.com/earthquake/us7000twzl-m4-4-earthquake-86-km-ne-of-choshi-chiba-japan, data from USGS, GFZ.

JSON: /api/v1/events/us7000twzl. SeismoAtlas is not an official warning service.