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Japan · Chiba Prefecture

M3.8 Earthquake near Asahi, Chiba Prefecture (Japan)

UTC time: 2026-09-27 00:45:30 UTC Local time: —

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About this earthquake

On September 27, 2026 at 00:45 UTC, a magnitude M3.8 earthquake occurred near Asahi, Chiba Prefecture (Japan). The hypocenter lay relatively close to the surface at around 50 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The event was recorded by EMSC.

Details

ID
d175ec5e05dfc442da6830442087603602953c22
Magnitude
M3.8
Depth
50.0 km
UTC time
2026-09-27 00:45:30 UTC
Local time
—
Country
Japan
State
Chiba Prefecture
City
Asahi
Source
emsc
Coordinates
35.70000, 140.70000
Temperature
21.1°C

Depth profile

Depth profile Depth: 50 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 50 km
Shallow
50 km
50 km — deeper 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

Volcanoes nearby

  • Takaharayama
    Distance: 157 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Nantaisan
    Distance: 161 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Hakoneyama
    Distance: 161 km ·Complex ·Elevation: 1'438 m ·Last eruption: 2015 ·Japan
  • Izu-Oshima
    Distance: 161 km ·Stratovolcano ·Elevation: 758 m ·Last eruption: 1990 ·Japan
  • Omanago Group
    Distance: 165 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Akagisan
    Distance: 166 km ·Stratovolcano ·Elevation: 1'828 m ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Narita International AirportJapan · NRT · RJAA
    29.1 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-10-04

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Chiba Prefecture

Context for this earthquake

04 Oct 2025 – 04 Oct 2026 · M ≥ 3.0 · 34 Catalogue entries

Of 33 other entries for this area and period, 13 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

Historic earthquake map · Japan

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Country statistics · Japan

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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