Hachijo Town earthquake and Shindo history
八丈町
Earthquakes for which stations associated with Hachijo Town reported an actual Shindo observation.
Latest observation: Aug 23, 2026, 02:00 AM JSTLocal seismic profile
Since Jan 24, 2015, stations associated with Hachijo Town have reported a local reading for 108 earthquakes. Shindo 1 was most common, while the highest local level, Shindo 4, was recorded 1 times.
Latest observationAug 23, 2026
Highest local Shindo4
Observed events108Jan 24, 2015–Aug 23, 2026
Associated observation stations7JMA
Latest observation: Aug 23, 2026
Recent observed earthquakes
No local observation in the last 7 days. Latest observation: Aug 23, 2026
震度1
Aug 23, 2026, 02:00 AM JSTSouthern Ibaraki Prefecture
震度2M5.9 · 70 km · 323 km
Aug 21, 2026, 09:02 PM JSTOff the east Coast of Hachijojima Island
震度1M5.5 · 60 km · 93 km
Aug 4, 2026, 01:46 PM JSTOff the east Coast of Hachijojima Island
震度1M4.8 · 60 km · 91 km
Jun 6, 2026, 08:29 PM JSTOff the east Coast of Hachijojima Island
震度1M4.8 · 50 km · 96 km
Dec 19, 2025, 09:54 PM JSTOff the east Coast of Hachijojima Island
震度1M4.6 · 150 km · 68 km
Sep 9, 2025, 08:08 PM JSTAdjacent Sea of Miyakejima Island
M4.3 · 20 km · 71 km
7 Associated observation stations
Open this place on the mapStations and strongest local observations
The map combines stations assigned to this place with earthquakes that produced its strongest local readings.
Jan 24, 2015 to Aug 23, 2026 · 23 records
All years · Shindo 2+ · Clear filtersObservation history
This history counts earthquakes observed at stations in the place, not earthquakes whose epicentre lies inside its boundary. Counts can change as stations are updated and older or corrected observations are added.
First observation: Jan 24, 2015
All yearsObserved events by year
Choose a year to update the event history and local Shindo distribution.
All years
All ShindoShindo observed in this place
The highest reading from stations in this place, not the maximum Shindo of the whole event.
Latest observation: Aug 23, 2026
Recent observed earthquakes
23 observed earthquakes
- 震度2Aug 21, 2026, 21:02 JSTOff the east Coast of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 3M5.560 km
- 震度2Jun 19, 2025, 16:37 JSTAdjacent Sea of Miyakejima IslandShindo in this place: 2 · Event maximum Shindo: 2M4.720 km
- 震度2Jul 18, 2024, 20:07 JSTOff the east Coast of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 3M5.8100 km
- 震度2Jul 6, 2024, 19:21 JSTOff the east Coast of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 2M4.860 km
- 震度2Jun 25, 2024, 17:31 JSTOff the east Coast of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 2M5.640 km
- 震度2May 15, 2023, 01:23 JSTAdjacent Sea of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 2M5.210 km
- 震度2May 14, 2023, 19:11 JSTAdjacent Sea of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 2M5.910 km
- 震度2May 14, 2023, 17:21 JSTAdjacent Sea of Hachijojima IslandShindo in this place: 2 · Event maximum Shindo: 2M5.910 km
Ground & J-SHIS
A change in the number of observations cannot by itself predict a larger earthquake.
Local seismic profile
Where the shaking usually comes from
Source regions of earthquakes observed here, ordered by the number of reports.
4
Adjacent Sea of Hachijojima Island八丈島近海
483
Off the east Coast of Hachijojima Island八丈島東方沖
402
Adjacent Sea of Miyakejima Island三宅島近海
42
Off the southeast Coast of Chiba Prefecture千葉県南東沖
32
Off the Coast of Fukushima Prefecture福島県沖
31
Adjacent Sea of Torishima Island鳥島近海
3Local seismic profile
Recent observations in long-term context
A change in the number of observations cannot by itself predict a larger earthquake.
Reference model · not a forecast J-SHIS (NIED) · 250 m · 4939563332
J-SHIS / NIEDGround conditions near an observation station
J-SHIS data for the 250 m mesh containing 八丈町三根.
How to read these values
A landform class assigned to the whole 250 m mesh and used to estimate AVS30. The name alone does not determine safety, and it is model data rather than a borehole survey at the station.
The average speed of an S-wave through the upper 30 metres. A lower value generally indicates softer material that can amplify shaking more. J-SHIS uses this value to estimate the amplification shown to the right. It is not predicted Shindo.
For the same incoming wave, local ground conditions may make peak-motion velocity at the surface about 34% higher than at engineering bedrock (Vs = 400 m/s). This value describes motion velocity—it does not multiply magnitude or forecast ground acceleration.
Ground conditions can change over short distances. These values do not rate the whole place or the safety of a building, and they cannot predict an earthquake. Source: J-SHIS (NIED), V4 model; processed for presentation by JISHINDESU.
Local seismic profile
Nearby places
Municipalities nearest to the representative station position.
Understand local Shindo in context
Guides to this place’s history, seismic intensity and notification tools.
8 min readJapan’s Shindo Scale Explained: What Levels 0–7 Mean
Shindo is Japan’s earthquake intensity scale. See what shaking each level means, from 0 to 7, and why a local Shindo reading is different from magnitude.
Read guide →10 min readHow to use the JISHINDESU interactive mapA guide to the redesigned map panel: adding and switching places, ten years of history, filters, local Shindo readings, sharing and notifications.
Read guide →6 min readAre earthquakes becoming more frequent in Japan?How to compare earthquake counts fairly—and why a few active days do not prove a lasting increase.
Read guide →4 min readAway from home? Monitor earthquakes in your Japanese townUse home as the reference point and receive notifications without an account when a station within the selected radius reports your chosen Shindo level.
Read guide →