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DAILY EARTHQUAKE ARCHIVE

Earthquakes in Japan on September 20, 2025

Replay earthquakes recorded on this day at their actual occurrence times and inspect every available report.

earthquakes
18
strongest Shindo
3
largest magnitude
M4.3
Shindo 1+ events
18

Replay one day of earthquakes

2025-09-20 · JST00:00:00Pause
Shindo12345−5+6−6+7
00:0006:0012:0018:0024:00
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JISHINDESU catalogue organised from JMA and P2PQuake data. Times use JST. Points are reported epicentres and observations, not simulated wave propagation.

Reading the daily record

How to read the record for September 20, 2025

The JISHINDESU catalogue contains 18 earthquakes for this day; 18 reached maximum Shindo 1 or higher. The day's highest Shindo was 3, and its largest reported magnitude was M4.3.

Earthquake with the day's highest ShindoAdjacent Sea of Tokara Islands23:45:00 JST · M4.2 · Shindo 3
01

Catalogue time, not a wave simulation

The replay reveals reports at their recorded JST origin times. Station dots show observed Shindo, but the moment they appear is not a measured seismic-wave arrival time.

02

Shindo and magnitude measure different things

Magnitude describes the earthquake at its source; Shindo describes shaking at each station. One earthquake can therefore produce different Shindo readings by location.

Shindo and magnitude explained →
03

A record can be updated later

Follow-up bulletins and corrections for the same earthquake are consolidated into one record. Each report page shows the current values and any available revision history.

Data and methodology →
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Daily record

Earthquake reports

18 earthquakes · Shindo 3 · M4.3

September 20, 2025

  1. 震度2Off the Coast of Ibaraki Prefecture茨城県沖03:02 JSTconfirmedM4.3Depth: 40 km
  2. 震度1Off the Coast of Ibaraki Prefecture茨城県沖03:18 JSTconfirmedM3.2Depth: 40 km
  3. 震度1Off the Coast of Ibaraki Prefecture茨城県沖03:20 JSTconfirmedM3.3Depth: 40 km
  4. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海04:04 JSTconfirmedM2.0Depth: 10 km
  5. 震度2Adjacent Sea of Tokara Islandsトカラ列島近海08:02 JSTconfirmedM2.5Depth: 10 km
  6. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海11:31 JSTconfirmedM1.7Depth: 0 km
  7. 震度3Adjacent Sea of Tokara Islandsトカラ列島近海13:02 JSTconfirmedM3.0Depth: 0 km
  8. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海19:16 JSTconfirmedM2.0Depth: 10 km
  9. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海19:49 JSTconfirmedM2.0Depth: 10 km
  10. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海20:12 JSTconfirmedM2.2Depth: 0 km
  11. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海20:23 JSTconfirmedM2.0Depth: 0 km
  12. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海20:24 JSTconfirmedM2.0Depth: 0 km
  13. 震度3Adjacent Sea of Tokara Islandsトカラ列島近海21:32 JSTconfirmedM3.4Depth: 10 km
  14. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海21:33 JSTconfirmedM2.0Depth: 0 km
  15. 震度2Adjacent Sea of Tokara Islandsトカラ列島近海22:04 JSTconfirmedM3.3Depth: 0 km
  16. 震度3Adjacent Sea of Tokara Islandsトカラ列島近海23:45 JSTconfirmedM4.2Depth: 0 km
  17. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海23:49 JSTconfirmedM2.3Depth: 0 km
  18. 震度1Adjacent Sea of Tokara Islandsトカラ列島近海23:53 JSTconfirmedM2.5Depth: 0 km