Sammu City earthquake and Shindo history in 2023
山武市
This annual view includes only earthquakes from 2023 for which stations associated with Sammu City recorded Shindo.
Data period: 1 January–31 December 2023In 2023, stations associated with Sammu City reported local Shindo for 49 earthquakes. The highest local level recorded that year was Shindo 4.
Observation history · 2023
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.
Observed events by year
Choose a year to update the event history and local Shindo distribution.
Shindo observed in this place
The highest reading from stations in this place, not the maximum Shindo of the whole event.
Observation history · 2023
49 observed earthquakes
- 震度2Dec 22, 2023, 05:45 JSTOff the east Coast of Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 2M5.110 km
- 震度2Dec 22, 2023, 01:12 JSTOff the east Coast of Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 2M5.010 km
- 震度2Dec 21, 2023, 23:04 JSTOff the east Coast of Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 2M5.320 km
- 震度1Dec 21, 2023, 20:29 JSTOff the east Coast of Chiba PrefectureShindo in this place: 1 · Event maximum Shindo: 2M4.820 km
- 震度1Dec 17, 2023, 14:11 JSTSouthern Tochigi PrefectureShindo in this place: 1 · Event maximum Shindo: 3M4.360 km
- 震度1Dec 8, 2023, 03:53 JSTNorthwestern Chiba PrefectureShindo in this place: 1 · Event maximum Shindo: 1M3.770 km
- 震度1Nov 10, 2023, 10:00 JSTEastern Kanagawa PrefectureShindo in this place: 1 · Event maximum Shindo: 3M4.2110 km
- 震度1Sep 24, 2023, 00:01 JSTNortheastern Chiba PrefectureShindo in this place: 1 · Event maximum Shindo: 2M3.950 km
Ground & J-SHIS
The context below uses the place's full available history and reference models; it is not part of the 2023 statistics.
Where the shaking usually comes from
Source regions of earthquakes observed here, ordered by the number of reports.
Earthquake 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.
Modelled magnitude: M7.9–8.6
Read about this model #2Subduction-zone earthquakeMega earthquakes along the Japan Trench (Great East Japan Earthquake 2011 type)日本海溝沿いの超巨大地震（東北地方太平洋沖型）Modelled magnitude: M8.6–9.0
Read about this model #3Major active faultFukaya/Ayasegawa fault zone (All segment)深谷断層・綾瀬川断層（全体が同時に活動）Modelled magnitude: M7.5
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.
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.
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 →