M5.7 earthquake 107 km ENE of Choshi, Chiba, Japan
A magnitude 5.7 earthquake struck 107 km ENE of Choshi, Chiba, Japan at 13:52 local time (04:52 UTC) on 9 Nov 2026, at a depth of 24 km, according to USGS, GFZ and INGV.
Reported by 3 agencies
Data: USGS, GFZ, INGV · updated 2026-11-09 05:02 UTC · reviewed
- Magnitude
- 5.7moderate
moment magnitude (W phase) (mww) - Depth
- 24.2 km
- Status
- Reviewed
- Origin time
- 2026-11-09 04:52:51 UTC
- Local: 9 Nov 2026, 13:52:51 (Asia/Tokyo)
- Epicentre
- 36.247° N, 141.830° E
Circles show this event and others within 89 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 | 107 km | IVLight |
| HasakiChiba, Japan · pop. 39,209 | 107 km | IVLight |
| KamisuIbaraki, Japan · pop. 95,454 | 111 km | IVLight |
| Kashima-shiIbaraki, Japan · pop. 66,950 | 111 km | IVLight |
| IwakiFukushima, Japan · pop. 357,309 | 123 km | IVLight |
| MitoIbaraki, Japan · pop. 270,685 | 124 km | IVLight |
| ChibaJapan · pop. 979,768 | 170 km | IIIWeak |
| KashiwaChiba, Japan · pop. 433,436 | 172 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 270 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 |
|---|---|---|---|---|---|
| USGSheadlineUSGS NEIC via U.S. Geological Survey | 5.7 mww | 24.2 km | 36.25° N, 141.83° E | – | Reviewed |
| GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences | 5.6 Mwwas 5.8 | 10 km | 36.21° N, 141.65° E | −0.3 s | Automatic · 2 revisions |
| INGVSURVEY-INGV-A via Istituto Nazionale di Geofisica e Vulcanologia | 6.1 Mwp | 14.8 km | 36.19° N, 141.85° E | +0.3 s | Automatic |
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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 5.4 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 24 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M5.7 releases about 32× the energy of M4.7, and its waves are about 10× taller on a seismogram. Energy: 5.4 kt of TNT vs 169 t of TNT.
Each square is the energy of one M4.7. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
4 later earthquakes within 89 km; the largest was M4.6 3 days ago. 4 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M5.7
4 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 0.14 | 4.5 | 40 |
| 0.15 | 4.6 | 35 |
| 24.45 | 4.5 | 30 |
| 47.07 | 4.6 | 20 |
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 us7000tx1f. First recorded here 9 Nov 2026, 05:04:03 UTC. Solutions: USGS (usgs:us7000tx1f); GFZ (geofon:gfz2026vykr); INGV (ingv:47887922). Cite as: SeismoAtlas, “M5.7 earthquake 107 km ENE of Choshi, Chiba, Japan”, https://seismoatlas.com/earthquake/us7000tx1f-m5-7-earthquake-107-km-ene-of-choshi-chiba-japan, data from USGS, GFZ, INGV.
JSON: /api/v1/events/us7000tx1f. SeismoAtlas is not an official warning service.