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M4.7 Depth: 34.8 km

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

UTC time: 2026-08-29 15:17:06 UTC Local time: —

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. Japan: over the past 24 hours, QuakeMap24 logged 2 earthquakes, the strongest at M4.0.

Details

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

Map

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 (32.9 km)
Regional average: 32.9 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

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

Historic earthquake map · Japan

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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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