Magnitude
M5.2
- Depth
- 10.0 km
- Source
- SERBIA_RSZ
Chiba Prefecture · Sammu
Country overviewJapan · Chiba Prefecture
M5.2 Earthquake near Sammu, Chiba Prefecture (Japan)
Earthquake newsQuakeMap24
First published: Content updated:
Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.
Map
About this earthquake
On October 1, 2026 at 12:27 UTC, a magnitude M5.2 earthquake occurred near Sammu, Chiba Prefecture (Japan). The hypocenter lay relatively close to the surface at around 10 km, increasing how strongly it was felt. Earthquakes of this magnitude can damage poorly built structures.
The data is provided by Seismological Survey of Serbia and cross-checked across seismological networks. Japan: over the past 24 hours, QuakeMap24 logged 2 earthquakes, the strongest at M3.9.
Details
ID
2c10f9d5bc3dea37b11cf9305a0e6d4b490a15e6
Magnitude
M5.2
Depth
10.0 km
UTC time
2026-10-01 12:27:07 UTC
Local time
—
Country
State
City
Source
serbia_rsz
Coordinates
35.54000,
140.50000
Temperature
23.5°C
Depth profile
Shallow
10 km
10 km — shallower than the regional average (33.2 km)
Regional average: 33.2 km
Why depth matters
Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.
Depth classes per USGS
Estimated impact
25
Felt reports · max reported intensity 3.7
Tectonic context
Located on the Okhotsk Plate.
Near the boundary Okhotsk ↔ Philippine Sea · about 68 km away
Nearby population centers
Distances are straight-line distances from the epicenter. Population data: GeoNames.
PlaceDistanceDirectionPopulation
Isumi31.2 kmW35'544
Ichihara70.0 kmNW283'531
Chiba72.8 kmNW979'768
GeoNames · CC BY 4.0
Volcanoes nearby
Radius · 100 km
Nearby infrastructure
Airports
- Narita International Airport27.3 kmStraight-line distance
Japan · NRT · RJAA - Tokyo Haneda International Airport64.5 kmStraight-line distanceJapan · HND · RJTT
- Ibaraki Airport71.7 kmStraight-line distanceJapan · IBR · RJAH
Source: OurAirports · Dataset date: 2026-10-04
Nuclear power plants
- Tokai nuclear power plant98.5 kmStraight-line distanceJapanUnder construction · Permanently shut downReactor units at site: 2
Source: Global Energy Monitor · Global Nuclear Power Tracker · Dataset date: 2026-08
This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates
Subsequent earthquakes nearby
Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.
First 6 hours3
First 24 hours4
First 72 hours4
Strongest subsequent eventM5.1
Comparison of seismic sources
2 sources currently report magnitudes from M5.2 to M5.5.
Measurements can differ because agencies use different networks and calculation methods. Values may be revised.
SourceMagnitudeDepthPosition difference
RESIFM5.510.0 km44.6 km
SERBIA_RSZM5.210.0 km0.0 km
No unambiguous area assignment
Context for this earthquake
This event has no unambiguous country assignment in the analysed catalogue. It is therefore not assigned to a regional profile.
Earthquake overviewHistorical context nearby
Comparison with recorded earthquakes before this event within 150 km.
Magnitude rank#8
Earlier events M≥4122
Earlier events M≥535
Compared since2025-01-04
The QuakeMap24 comparison dataset begins on 2024-03-23. Earlier earthquakes may not be included.
Strongest earlier events
Historic earthquake map · Japan
Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.
Country statistics · Japan
View earthquake KPIs, strongest and latest events, and averages for this country.
Stats (last 24h)
Global (24h)
459
Country (24h)
Japan
2