M5.6 earthquake 87 km NE of Choshi, Chiba, Japan
A magnitude 5.6 earthquake struck 87 km NE of Choshi, Chiba, Japan at 20:07 local time (11:07 UTC) on 7 Nov 2026, at a depth of 20 km, according to JMA. The solution is preliminary and may be revised.
Data: JMA · updated 2026-11-07 11:12 UTC · automatic solution
- Magnitude
- 5.6moderate
JMA magnitude (Mj) - Depth
- 20 km
- Status
- Automatic
- Origin time
- 2026-11-07 11:07:00 UTC
- Local: 7 Nov 2026, 20:07:00 (Asia/Tokyo)
- Epicentre
- 36.200° N, 141.600° E
Circles show this event and others within 80 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 | 87 km | IVLight |
| HasakiChiba, Japan · pop. 39,209 | 87 km | IVLight |
| Kashima-shiIbaraki, Japan · pop. 66,950 | 90 km | IVLight |
| KamisuIbaraki, Japan · pop. 95,454 | 90 km | IVLight |
| MitoIbaraki, Japan · pop. 270,685 | 104 km | IVLight |
| IwakiFukushima, Japan · pop. 357,309 | 114 km | IIIWeak |
| ChibaJapan · pop. 979,768 | 149 km | IIIWeak |
| KashiwaChiba, Japan · pop. 433,436 | 151 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 243 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 | 5.6 Mj | 20 km | 36.20° N, 141.60° E | – | 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 3.8 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 20 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M5.6 releases about 32× the energy of M4.6, and its waves are about 10× taller on a seismogram. Energy: 3.8 kt of TNT vs 120 t of TNT.
Each square is the energy of one M4.6. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
8 later earthquakes within 80 km; the largest was M5.9 3 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M5.6
8 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 0.01 | 5.5 | 32 |
| 35.31 | 4.4 | 10 |
| 41.75 | 5.9 | 10 |
| 41.76 | 5.7 | 24 |
| 41.90 | 4.5 | 40 |
| 41.91 | 4.6 | 35 |
| 66.22 | 4.5 | 30 |
| 88.83 | 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
- 5.575 km NE of Choshi, Chiba, Japan11-07 11:07
- 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 jma20261107200747. First recorded here 7 Nov 2026, 11:14:01 UTC. Solutions: JMA (jma:20261107200747). Cite as: SeismoAtlas, “M5.6 earthquake 87 km NE of Choshi, Chiba, Japan”, https://seismoatlas.com/earthquake/jma20261107200747-m5-6-earthquake-87-km-ne-of-choshi-chiba-japan, data from JMA.
JSON: /api/v1/events/jma20261107200747. SeismoAtlas is not an official warning service.