Minamiboso City earthquake and Shindo history
南房総市
Earthquakes for which stations associated with Minamiboso City reported an actual Shindo observation.
Latest observation: Sep 17, 2026, 12:07 AM JSTLATEST LOCAL OBSERVATION
Latest earthquake observed in Minamiboso City
震度2
Highest Shindo observed in Minamiboso CitySource region: Southern Ibaraki PrefectureM4.8
Local seismic profile
Since Feb 23, 2015, stations associated with Minamiboso City have reported a local reading for 270 earthquakes. Shindo 1 was most common, while the highest local level, Shindo 4, was recorded 7 times.
Latest observationSep 17, 2026
Highest local Shindo4
Observed events270Feb 23, 2015–Sep 17, 2026
Associated observation stations8JMA
Latest observation: Sep 17, 2026
Recent observed earthquakes
Earthquakes for which stations associated with Minamiboso City reported an actual Shindo observation.
震度2
Sep 17, 2026, 12:07 AM JSTSouthern Ibaraki Prefecture
震度3M4.8 · 70 km · 121 km
Aug 23, 2026, 02:00 AM JSTSouthern Ibaraki Prefecture
震度2M5.9 · 70 km · 110 km
Aug 21, 2026, 09:02 PM JSTOff the east Coast of Hachijojima Island
震度4M5.5 · 60 km · 156 km
Jun 26, 2026, 10:29 PM JSTEastern Region · Fuji Five Lakes, Yamanashi Prefecture
震度2M5.6 · 20 km · 105 km
Jun 26, 2026, 12:46 PM JSTNortheastern Chiba Prefecture
震度2M5.8 · 50 km · 98 km
Jun 25, 2026, 07:30 AM JSTOff the Coast of Iwate Prefecture
M6.9 · 50 km · 613 km
8 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.
Feb 23, 2015 to Sep 17, 2026 · 270 records
Observation 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: Feb 23, 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: Sep 17, 2026
Recent observed earthquakes
270 observed earthquakes
- 震度2Sep 17, 2026, 00:07 JSTSouthern Ibaraki PrefectureShindo in this place: 2 · Event maximum Shindo: 3M4.870 km
- 震度3Aug 23, 2026, 02:00 JSTSouthern Ibaraki PrefectureShindo in this place: 3 · Event maximum Shindo: 5−M5.970 km
- 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4Jun 26, 2026, 22:29 JSTEastern Region · Fuji Five Lakes, Yamanashi PrefectureShindo in this place: 4 · Event maximum Shindo: 6−M5.620 km
- 震度2Jun 26, 2026, 12:46 JSTNortheastern Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 4M5.850 km
- 震度2Jun 25, 2026, 07:30 JSTOff the Coast of Iwate PrefectureShindo in this place: 2 · Event maximum Shindo: 6+M6.950 km
- 震度2Jun 16, 2026, 19:46 JSTSouthern Ibaraki PrefectureShindo in this place: 2 · Event maximum Shindo: 5−M5.550 km
- 震度1May 15, 2026, 20:22 JSTOff the Coast of Miyagi PrefectureShindo in this place: 1 · Event maximum Shindo: 5−M6.350 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
Off the southeast Coast of Chiba Prefecture千葉県南東沖
404
Northwestern Chiba Prefecture千葉県北西部
363
Southern Ibaraki Prefecture茨城県南部
324
Off the east Coast of Chiba Prefecture千葉県東方沖
294
Southern Chiba Prefecture千葉県南部
233
Adjacent Sea of Izu-Oshima Island伊豆大島近海
12Local 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) · A12234
J-SHIS / NIEDEarthquake scenarios affecting this place
Official J-SHIS models ranked for their potential impact on this municipality.
#1 means the model ranks highest in the J-SHIS result for this place under the same settings. It is not a ranking of which earthquake will happen next.
Magnitude on a card describes the size of the whole earthquake model, not the Shindo expected here. Local shaking also depends on distance, depth and ground conditions.
#1Subduction-zone earthquakeSagami Trough earthquakes (M8 class)相模トラフ沿いのM8クラスの地震
Modelled magnitude: M7.9–8.6
Read about this model #2Major active faultKamogawa-teichi fault zone鴨川低地断層帯Modelled magnitude: M6.7
Read about this model #3Other active faultKamogawa-techi fault zone kita fault鴨川低地断層帯北断層Modelled magnitude: M6.8
Read about this model #4Major active faultMiura-hanto fault group (Southern part)三浦半島断層群南部Modelled magnitude: M7.0
Read about this model #5Major active faultMiura-hanto fault group (Main part/Kinugasa/Kitatake fault zone)三浦半島断層群主部衣笠・北武断層帯Modelled magnitude: M6.7
Read about this model #6Major active faultMiura-hanto fault group (Main part/Takeyama fault zone)三浦半島断層群主部武山断層帯Modelled magnitude: M6.5
Read about this model #7Subduction-zone earthquakeLarge Earthquakes along the Nankai Trough南海トラフ沿いで発生する大地震Modelled magnitude: M8.2–9.1
Read about this modelJ-SHIS 2020 model, 30-year period and Shindo 6-lower threshold. This is not a prediction of a particular earthquake. Source: J-SHIS (NIED); 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: Earthquake Intensity Levels 0–7
Learn what Japan’s Shindo earthquake intensity scale measures, what levels 0, 5 Lower, 5 Upper and 7 mean, and why Shindo 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 →