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Japan · Chiba Prefecture

M4.7 Earthquake near Choshi, Chiba Prefecture (Japan)

UTC time: 2026-08-29 15:17:06 UTC Local time: —
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Archive record · original publication time was not recorded Content updated:

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

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About this earthquake

A magnitude M4.7 earthquake was recorded near Choshi, Chiba Prefecture (Japan) on August 29, 2026 at 15:17 UTC. The hypocenter lay relatively close to the surface at around 35 km, increasing how strongly it was felt. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The event was recorded by USGS.

Details

ID
154d17b53d9b5b792685ab64cce2cb49b8956887
Magnitude
M4.7
Depth
34.8 km
UTC time
2026-08-29 15:17:06 UTC
Local time
—
Country
Japan
State
Chiba Prefecture
City
Choshi
Source
usgs
Coordinates
35.80290, 140.99370
Temperature
23.8°C

Depth profile

Depth profile Depth: 34.8 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 34.8 km
Shallow
34.8 km
34.8 km — close to the regional average (33.1 km)
Regional average: 33.1 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

5felt 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 29, 2026, 10:00 PM UTC · Last checked: Sep 20, 2026, 3:22 PM UTC

Source: EMSC / LastQuake

Estimated impact

10 Felt reports · max reported intensity 3.8

Tectonic context

Located on the Okhotsk Plate.
Near the boundary Pacific ↔ Okhotsk · about 120 km away

Volcanoes nearby

  • Takaharayama
    Distance: 164 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Nantaisan
    Distance: 172 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Nasudake
    Distance: 173 km ·Stratovolcano(es) ·Elevation: 1'915 m ·Last eruption: 1963 ·Japan
  • Omanago Group
    Distance: 176 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Akagisan
    Distance: 182 km ·Stratovolcano ·Elevation: 1'828 m ·Japan
  • Nikko-Shiranesan
    Distance: 182 km ·Shield ·Elevation: 2'578 m ·Last eruption: 1952 ·Japan

Japan

Context for this earthquake

20 Sep 2025 – 20 Sep 2026 · M ≥ 3.0 · 952 Catalogue entries

Of 951 other entries for this area and period, 109 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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