M5.5 earthquake 75 km NE of Choshi, Chiba, Japan
A magnitude 5.5 earthquake struck 75 km NE of Choshi, Chiba, Japan at 20:07 local time (11:07 UTC) on 7 Nov 2026, at a depth of 32 km, according to USGS, GFZ and INGV.
Reported by 3 agencies · revised from M5.4
Data: USGS, GFZ, INGV · updated 2026-11-07 11:23 UTC · reviewed
- Magnitude
- 5.5moderate
moment magnitude (W phase) (mww)
revised from 5.4 - Depth
- 31.7 km
- Status
- Reviewed
- Origin time
- 2026-11-07 11:07:43 UTC
- Local: 7 Nov 2026, 20:07:43 (Asia/Tokyo)
- Epicentre
- 36.188° N, 141.440° E
Circles show this event and others within 71 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| ChoshiChiba, Japan · pop. 58,431 | 75 km | IVLight |
| HasakiChiba, Japan · pop. 39,209 | 75 km | IVLight |
| Kashima-shiIbaraki, Japan · pop. 66,950 | 76 km | IVLight |
| KamisuIbaraki, Japan · pop. 95,454 | 76 km | IVLight |
| MitoIbaraki, Japan · pop. 270,685 | 91 km | IVLight |
| IwakiFukushima, Japan · pop. 357,309 | 108 km | IIIWeak |
| ChibaJapan · pop. 979,768 | 136 km | IIIWeak |
| KashiwaChiba, Japan · pop. 433,436 | 136 km | IIIWeak |
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 216 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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences | 5.5 Mwwas 5.6 | 32 km | 36.23° N, 141.43° E | +0.3 s | Automatic · 2 revisions |
| INGVSURVEY-INGV-A via Istituto Nazionale di Geofisica e Vulcanologia | 5.6 Mwp | 19.3 km | 36.14° N, 141.81° E | −2.5 s | Automatic |
| USGSheadlineUSGS NEIC via U.S. Geological Survey | 5.5 mww | 31.7 km | 36.19° N, 141.44° E | – | Reviewed |
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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 2.7 kt 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 32 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M5.5 releases about 32× the energy of M4.5, and its waves are about 10× taller on a seismogram. Energy: 2.7 kt of TNT vs 85 t of TNT.
Each square is the energy of one M4.5. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
7 later earthquakes within 71 km; the largest was M5.9 3 days ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M5.5
7 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 35.30 | 4.4 | 10 |
| 41.74 | 5.9 | 10 |
| 41.75 | 5.7 | 24 |
| 41.89 | 4.5 | 40 |
| 41.90 | 4.6 | 35 |
| 66.20 | 4.5 | 30 |
| 88.82 | 4.6 | 20 |
- 5.9134 km ENE of Choshi, Chiba, Japan11-09 04:52
- 5.7107 km ENE of Choshi, Chiba, Japan11-09 04:52
- 4.670 km ESE of Takahagi, Ibaraki, Japan11-09 05:01
- 4.699 km ESE of Takahagi, Ibaraki, Japan11-11 03:57
- 4.599 km ESE of Takahagi, Ibaraki, Japan11-09 05:01
- 4.591 km ESE of Hitachi, Ibaraki, Japan11-10 05:20
- 4.486 km NE of Choshi, Chiba, Japan11-08 22:25
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
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Event id gfz2026vvfz. First recorded here 7 Nov 2026, 11:19:26 UTC. Solutions: GFZ (geofon:gfz2026vvfz); INGV (ingv:47025431); USGS (usgs:us7000twrq). Cite as: SeismoAtlas, “M5.5 earthquake 75 km NE of Choshi, Chiba, Japan”, https://seismoatlas.com/earthquake/gfz2026vvfz-m5-5-earthquake-75-km-ne-of-choshi-chiba-japan, data from USGS, GFZ, INGV.
JSON: /api/v1/events/gfz2026vvfz. SeismoAtlas is not an official warning service.