December 25, 2021 at 04:41:00 JST
Northern Nagano Prefecture · M3.4 · Shindo 2
長野県北部
Places with the strongest observed Shindo
These municipalities had the highest station readings in this report. Open a place to compare this earthquake with its local history.
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Shindo readings and epicentre
Each numbered marker is an actual station reading. The orange M marker shows the epicentre.
Observed Shindo by station
These are actual readings reported at JMA and partner stations, not estimates.
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| Shindo | Station | Prefecture | Distance from epicentre |
|---|---|---|---|
| 2 | Iiyama City飯山市飯山福寿町 | Nagano | 21.2 km |
| 1 | Sakae Village栄村小赤沢 | Nagano | 4.3 km |
| 1 | Sakae Village栄村北信 | Nagano | 10.1 km |
| 1 | Tsunan Town津南町下船渡 | Niigata | 13.0 km |
| 1 | Nozawaonsen Village野沢温泉村豊郷 | Nagano | 14.4 km |
| 1 | Kijimadaira Village木島平村往郷 | Nagano | 17.5 km |
| 1 | Tokamachi City十日町市上山 | Niigata | 18.9 km |
| 1 | Yuzawa Town湯沢町神立 | Niigata | 19.9 km |
| 1 | Tokamachi City十日町市松代 | Niigata | 25.5 km |
| 1 | Nakanojo Town中之条町入山 | Gunma | 28.1 km |
| 1 | 上越市安塚区安塚 | Niigata | 28.8 km |
| 1 | Kusatsu Town草津町草津 | Gunma | 31.1 km |
| 1 | Nakanojo Town中之条町日影 | Gunma | 37.3 km |
Report updates
Status, time and revision available in the stored report. Field-by-field differences may not be retained.
- Confirmed
Revision 1 · p2pquake
Sources and bulletins
Multiple source bulletins do not necessarily represent multiple corrections.
- P2PQUAKEIssued: December 25, 2021 at 04:44:17Received: July 31, 2026 at 00:27:55
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Understand this earthquake report
Read Shindo, magnitude and JMA information in the right context.
A guide to event and issue times, hypocentre, depth, Shindo, tsunami information, preliminary reports and corrections.
Read guide →5 min readWhat does earthquake depth mean?A plain-language guide to hypocentre depth and why shallow and deep earthquakes can feel very different.
Read guide →5 min readMagnitude vs Shindo: what is the difference?Magnitude describes the size of an earthquake at its source; Shindo describes shaking at a place. Learn why they are not interchangeable.
Read guide →6 min readCan every earthquake cause a tsunami?What creates a tsunami, why magnitude alone is not enough and when to leave the coast immediately.
Read guide →