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Japan · Chiba Prefecture

M3.4 Earthquake near Shiroi, Chiba Prefecture (Japan)

UTC time: 2026-08-09 09:59:30 UTC Local time: —

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About this earthquake

A magnitude M3.4 earthquake was recorded near Shiroi, Chiba Prefecture (Japan) on August 9, 2026 at 09:59 UTC. The earthquake originated at an intermediate depth of about 70 km. Earthquakes of this magnitude are often felt but rarely cause damage.

The event was recorded by EMSC. Japan: over the past 24 hours, QuakeMap24 logged 2 earthquakes, the strongest at M3.9.

Details

ID
42b8a47a7a58e5aa7ebbc805c65da40ed3c24c48
Magnitude
M3.4
Depth
70.0 km
UTC time
2026-08-09 09:59:30 UTC
Local time
—
Country
Japan
State
Chiba Prefecture
City
Shiroi
Source
emsc
Coordinates
35.80000, 140.10000
Temperature
26.7°C

Depth profile

Depth profile Depth: 70 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 70 km
Intermediate
70 km
70 km — deeper than the regional average (33.2 km)
Regional average: 33.2 km
Why depth matters

Intermediate-depth quakes are felt across a wider area but usually cause less surface damage.

Depth classes per USGS

Felt reports

1felt 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: Aug 9, 2026, 10:01 AM UTC · Last checked: Sep 9, 2026, 12:07 AM UTC

Source: EMSC / LastQuake

Volcanoes nearby

  • Hakoneyama
    Distance: 116 km ·Complex ·Elevation: 1'438 m ·Last eruption: 2015 ·Japan
  • Akagisan
    Distance: 117 km ·Stratovolcano ·Elevation: 1'828 m ·Japan
  • Nantaisan
    Distance: 120 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Omanago Group
    Distance: 125 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Takaharayama
    Distance: 126 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Nikko-Shiranesan
    Distance: 129 km ·Shield ·Elevation: 2'578 m ·Last eruption: 1952 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Narita International AirportJapan · NRT · RJAA
    26.3 kmStraight-line distance
  • Tokyo Haneda International AirportJapan · HND · RJTT
    39.7 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, 21 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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