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Japan · Chiba Prefecture

M4.1 Earthquake near Asahi, Chiba Prefecture (Japan)

UTC time: 2026-06-26 04:31:32 UTC Local time: —

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About this earthquake

On June 26, 2026 at 04:31 UTC, a magnitude M4.1 earthquake occurred near Asahi, Chiba Prefecture (Japan). With a focal depth of about 46 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The data is provided by EMSC and cross-checked across seismological networks. Japan: 2 earthquakes were recorded in the past 24 hours, the strongest reaching M3.9.

Details

ID
6b3a3f4451af12dab44a3b1710c367fc3746bf21
Magnitude
M4.1
Depth
46.0 km
UTC time
2026-06-26 04:31:32 UTC
Local time
—
Country
Japan
State
Chiba Prefecture
City
Asahi
Source
emsc
Coordinates
35.65620, 140.77330
Temperature
24.1°C

Depth profile

Depth profile Depth: 46 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 46 km
Shallow
46 km
46 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

Felt reports

3felt reports at EMSC / LastQuake

Voluntary reports of feeling this earthquake. The count is not an intensity measurement and is not added to USGS DYFI reports.

Data updated: Jun 26, 2026, 4:40 AM UTC · Last checked: Sep 6, 2026, 12:18 PM UTC

Source: EMSC / LastQuake

Volcanoes nearby

  • Izu-Oshima
    Distance: 163 km ·Stratovolcano ·Elevation: 758 m ·Last eruption: 1990 ·Japan
  • Takaharayama
    Distance: 165 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Hakoneyama
    Distance: 166 km ·Complex ·Elevation: 1'438 m ·Last eruption: 2015 ·Japan
  • Nantaisan
    Distance: 169 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Omanago Group
    Distance: 173 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Izu-Tobu
    Distance: 174 km ·Pyroclastic cone(s) ·Elevation: 580 m ·Last eruption: 1989 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Narita International AirportJapan · NRT · RJAA
    36.9 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, 11 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

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