Japan earthquakes, down to the local station
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JMA EPICENTRE REGION

Off the south Coast of Boso Peninsula

房総半島南方沖

earthquakes20
Maximum M4.7
Maximum Shindo2
FirstJan 23, 2015

What this epicentre-region name means

This page groups earthquakes whose JMA report uses this epicentre-region name. It identifies the reported epicentre region, not the area where shaking was felt or an administrative boundary.

JISHINDESU stores 20 confirmed or corrected reports from Jan 23, 2015 to Aug 24, 2026. This is not JMA’s complete historical earthquake catalogue. Dates and times use Japan Standard Time (JST).

Earthquakes in the stored history

The largest magnitude and highest Shindo may belong to different earthquakes. Open each report for its details.

Stored reports by year

The largest number of stored reports is 4 in 2026. Yearly counts describe the stored reports, not future activity or relative hazard.

  1. 20264
  2. 20251
  3. 20231
  4. 20222
  5. 20212
  6. 20203
  7. 20181
  8. 20171
  9. 20162
  10. 20153

Prefectures with observations

Each count is the number of earthquakes with a Shindo reading at a station in that prefecture. It does not locate the epicentre or imply shaking throughout the prefecture. One earthquake may appear in several prefectures.

TokyoEarthquakes observed: 17 · Highest local Shindo: 2ChibaEarthquakes observed: 12 · Highest local Shindo: 2ShizuokaEarthquakes observed: 9 · Highest local Shindo: 2KanagawaEarthquakes observed: 7 · Highest local Shindo: 2YamanashiEarthquakes observed: 4 · Highest local Shindo: 1SaitamaEarthquakes observed: 4 · Highest local Shindo: 1IbarakiEarthquakes observed: 2 · Highest local Shindo: 1TochigiEarthquakes observed: 1 · Highest local Shindo: 1

Recent earthquakes

Showing the latest 20 of 20 stored reports, not the complete list.

1Off the south Coast of Boso PeninsulaAug 24, 2026, 07:32 JST · M3.8View report →1Off the south Coast of Boso PeninsulaJul 1, 2026, 00:02 JST · M4.1View report →1Off the south Coast of Boso PeninsulaApr 1, 2026, 00:39 JST · M4.4View report →1Off the south Coast of Boso PeninsulaMar 22, 2026, 17:56 JST · M4.2View report →1Off the south Coast of Boso PeninsulaJun 17, 2025, 11:07 JST · M4.1View report →2Off the south Coast of Boso PeninsulaDec 9, 2023, 16:03 JST · M4.7View report →2Off the south Coast of Boso PeninsulaJul 5, 2022, 09:51 JST · M4.6View report →1Off the south Coast of Boso PeninsulaApr 10, 2022, 14:17 JST · M4View report →1Off the south Coast of Boso PeninsulaNov 13, 2021, 20:17 JST · M4.4View report →1Off the south Coast of Boso PeninsulaMar 20, 2021, 02:28 JST · M4.2View report →2Off the south Coast of Boso PeninsulaAug 4, 2020, 20:21 JST · M4.7View report →1Off the south Coast of Boso PeninsulaFeb 27, 2020, 02:27 JST · M3.6View report →1Off the south Coast of Boso PeninsulaFeb 24, 2020, 02:29 JST · M4.3View report →2Off the south Coast of Boso PeninsulaDec 4, 2018, 15:06 JST · M4.6View report →1Off the south Coast of Boso PeninsulaMay 28, 2017, 12:04 JST · M4.1View report →2Off the south Coast of Boso PeninsulaNov 23, 2016, 03:45 JST · M4.6View report →2Off the south Coast of Boso PeninsulaOct 12, 2016, 08:05 JST · M4.5View report →1Off the south Coast of Boso PeninsulaNov 30, 2015, 21:50 JST · M4.1View report →1Off the south Coast of Boso PeninsulaAug 19, 2015, 04:17 JST · M4.1View report →1Off the south Coast of Boso PeninsulaJan 23, 2015, 13:09 JST · M3.9View report →