Sammu City earthquake and Shindo history
山武市
Earthquakes for which stations associated with Sammu City reported an actual Shindo observation.
Latest observation: Sep 22, 2026, 03:34 PM JSTLATEST LOCAL OBSERVATION
Latest earthquake observed in Sammu City
震度1
Highest Shindo observed in Sammu CitySource region: Southern Ibaraki PrefectureM3.9
Local seismic profile
Since Jan 18, 2015, stations associated with Sammu City have reported a local reading for 649 earthquakes. Shindo 1 was most common, while the highest local level, Shindo 4, was recorded 14 times.
Latest observationSep 22, 2026
Highest local Shindo4
Observed events649Jan 18, 2015–Sep 22, 2026
Associated observation stations6JMA
Latest observation: Sep 22, 2026
Recent observed earthquakes
Earthquakes for which stations associated with Sammu City reported an actual Shindo observation.
震度1
Sep 22, 2026, 03:34 PM JSTSouthern Ibaraki Prefecture
震度2M3.9 · 50 km · 76 km
Sep 17, 2026, 12:07 AM JSTSouthern Ibaraki Prefecture
震度2M4.8 · 70 km · 62 km
Aug 30, 2026, 12:17 AM JSTOff the east Coast of Chiba Prefecture
震度4M4.8 · 30 km · 45 km
Aug 23, 2026, 02:00 AM JSTSouthern Ibaraki Prefecture
震度1M5.9 · 70 km · 53 km
Aug 21, 2026, 09:02 PM JSTOff the east Coast of Hachijojima Island
震度1M5.5 · 60 km · 213 km
Aug 20, 2026, 02:28 PM JSTOff the Coast of Ibaraki Prefecture
M4.2 · 40 km · 96 km
6 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 18, 2015 to Sep 22, 2026 · 649 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: Jan 18, 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 22, 2026
Recent observed earthquakes
649 observed earthquakes
- 震度1Sep 22, 2026, 15:34 JSTSouthern Ibaraki PrefectureShindo in this place: 1 · Event maximum Shindo: 3M3.950 km
- 震度2Sep 17, 2026, 00:07 JSTSouthern Ibaraki PrefectureShindo in this place: 2 · Event maximum Shindo: 3M4.870 km
- 震度2Aug 30, 2026, 00:17 JSTOff the east Coast of Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 4M4.830 km
- 震度4Aug 23, 2026, 02:00 JSTSouthern Ibaraki PrefectureShindo in this place: 4 · Event maximum Shindo: 5−M5.970 km
- 震度1Aug 21, 2026, 21:02 JSTOff the east Coast of Hachijojima IslandShindo in this place: 1 · Event maximum Shindo: 3M5.560 km
- 震度1Aug 20, 2026, 14:28 JSTOff the Coast of Ibaraki PrefectureShindo in this place: 1 · Event maximum Shindo: 3M4.240 km
- 震度2Jul 16, 2026, 09:01 JSTNortheastern Chiba PrefectureShindo in this place: 2 · Event maximum Shindo: 2M4.450 km
- 震度1Jul 2, 2026, 16:17 JSTNortheastern Chiba PrefectureShindo in this place: 1 · Event maximum Shindo: 2M3.850 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 east Coast of Chiba Prefecture千葉県東方沖
1784
Northeastern Chiba Prefecture千葉県北東部
894
Southern Ibaraki Prefecture茨城県南部
893
Off the Coast of Ibaraki Prefecture茨城県沖
664
Northwestern Chiba Prefecture千葉県北西部
634
Off the Coast of Fukushima Prefecture福島県沖
40Local 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) · A12237
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 #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.
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 →