M6.1 earthquake 148 km ESE of Choshi, Chiba, Japan
A magnitude 6.1 earthquake struck 148 km ESE of Choshi, Chiba, Japan at 19:39 local time (10:39 UTC) on 6 Nov 2026, at a depth of 10 km, according to JMA, GFZ, INGV and USGS. The solution is preliminary and may be revised.
Reported by 4 agencies · 21 reports to USGS “Did You Feel It?”
Data: JMA, GFZ, INGV, USGS · updated 2026-11-06 12:20 UTC · automatic solution
- Magnitude
- 6.1strong
JMA magnitude (Mj) - Depth
- 10 km
- Status
- Automatic
- Origin time
- 2026-11-06 10:39:00 UTC
- Local: 6 Nov 2026, 19:39:00 (Asia/Tokyo)
- Epicentre
- 35.000° N, 142.200° E
Circles show this event and others within 142 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 | 148 km | IVLight |
| HasakiChiba, Japan · pop. 39,209 | 148 km | IVLight |
| ChibaJapan · pop. 979,768 | 200 km | IIIWeak |
| IchiharaChiba, Japan · pop. 283,531 | 201 km | IIIWeak |
| MitoIbaraki, Japan · pop. 270,685 | 218 km | IIIWeak |
| KashiwaChiba, Japan · pop. 433,436 | 223 km | IIIWeak |
| MatsudoChiba, Japan · pop. 498,575 | 226 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 418 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 | 6.1 Mj | 10 km | 35.00° N, 142.20° E | – | Automatic |
| GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences | 6.0 Mwwas 6.3 | 31 km | 34.99° N, 142.16° E | +28.3 s | Automatic · 4 revisions |
| INGVSURVEY-INGV-A via Istituto Nazionale di Geofisica e Vulcanologia | 6.1 Mwp | 9 km | 34.97° N, 142.45° E | +24.9 s | Automatic |
| USGSUSGS NEIC via U.S. Geological Survey | 6.1 mww | 29 km | 34.97° N, 142.12° E | +27.9 s | Reviewed · 1 revision |
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How big was it?
Can cause damage over tens of kilometres, depending on depth, local ground and how buildings are built.
It released roughly the energy of 21 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 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M6.1 releases about 32× the energy of M5.1, and its waves are about 10× taller on a seismogram. Energy: 21 kt of TNT vs 674 t of TNT.
Each square is the energy of one M5.1. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
1 later earthquake within 142 km; the largest was M5.9 3 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M6.1
1 later earthquake nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 66.22 | 5.9 | 10 |
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
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Event id jma20261106193937. First recorded here 6 Nov 2026, 10:45:48 UTC. Solutions: JMA (jma:20261106193937); GFZ (geofon:gfz2026vtjo); INGV (ingv:47020191); USGS (usgs:us7000twg9). Cite as: SeismoAtlas, “M6.1 earthquake 148 km ESE of Choshi, Chiba, Japan”, https://seismoatlas.com/earthquake/jma20261106193937-m6-1-earthquake-148-km-ese-of-choshi-chiba-japan, data from JMA, GFZ, INGV, USGS.
JSON: /api/v1/events/jma20261106193937. SeismoAtlas is not an official warning service.