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Japan · Chiba Prefecture

M3.5 Earthquake near Asahi, Chiba Prefecture (Japan)

UTC time: 2026-10-28 20:22:30 UTC Local time: —

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About this earthquake

On October 28, 2026 at 20:22 UTC, a magnitude M3.5 earthquake occurred near Asahi, Chiba Prefecture (Japan). With a focal depth of about 50 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Shaking of this size is frequently noticed but usually harmless.

The data is provided by EMSC and cross-checked across seismological networks. Japan: 3 earthquakes were recorded in the past 24 hours, the strongest reaching M3.4.

Details

ID
8eefd227492be0984a5dcc17f202e12b409b1521
Magnitude
M3.5
Depth
50.0 km
UTC time
2026-10-28 20:22:30 UTC
Local time
—
Country
Japan
State
Chiba Prefecture
City
Asahi
Source
emsc
Coordinates
35.70000, 140.70000
Temperature
15.0°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 (33.9 km)
Regional average: 33.9 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: 2026-11-05

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

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 34 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · Japan

Open history map
Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · Japan

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

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